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MES33[XH4BC)
ELECTFIONIC
SUPPLIES
LTD
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P.O.Box3, RAYLEIGH, ESSEX. 556'8LR Tplephone: (0702) Southend-on-Sea 5541 55 Tlex 995695 rss.s.
A VERYHIGHQUALITY
4OW AMPTIFIE STERE(I
FORHOME CONSTRUCTION
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Specification
Power output both channels driven, continuous rms sine wave: 44W per channel into Bf,)at lkHz Power output, one channcl driven, continous rms sine wave: 50W per channel into BO at lkHz Frequencl, response of r'r'hole s1stem 1OHz to.l0kHz: -3dB Overall channel separation:- 1 channel drir-en at full power -50dB [unr v e i g h t e d) . Balance Control: -2dB to *8dB in either direction Rumble Filter srvitchable between flat, -12dB per octave below 32H2, and -18dB per,lctave below B0Hz. HF Filter switchable oeirleen 5kHz, 7.5kHz and 1skHz nrtn slope continuously variable in each setting between flat and -18d8 per octave above the switched frequencl Bass Control switchable betn'een two opera l i n g r a n g e sL o r v- 9 . , P . , l u T n o \ r : e frequency of 2ooHz and +tsdB boosl or cul al 30Hz: High - Biresa turnover frequency of 450H2 and +1SdB boost or cut at 80H2. Stereo Headphone Amp delivers 5\\' rms into BO ancl an internal preset sets the phones level. Two stereo headphones can be connected simultaneously. Tape, Tape Preview, Tuner and Aux inputs have sensitivity variable by internal presets from 4OmV to 1V, so that any equipment can bg exactlv matched into this amp. Hum and Noise:- better than -70c18 I u n r v e i g h t e c iI . Magnetic Pick-up inpui has sensitivity of 5mV into 47k(). Disc Hum and Noise:- better t]lan -OBdB (unlveighted).
Treble
Control switchable between two gives a operating ranges: High turnover frequency of 2.5kHz and +15dB boost or cut at 1SkHz:Lorr'g i r . e sa t u r n o r e r f r e q u e n e r o f 6 0 0 H 2 and + t sdB boost or cut at 6kHz. Tape Output levels variable by internal preset betu'een 40mV and 1V. Outputs for two separate pairs of loudspeakers. Outputs are short-circuit protected and fused. Mains facility outlets: one srvitched, two unswitched and all fused. Power amps. have individual fuses which also protect the pou'er supply. Maximum load: Not less than 4O per channei. Fast music transients are not limited by the output protection cirCuitry up to BOWpeaks into 8f). Peak overload detector LED's to indicate if input gain presets have been set too sensitive. Mono buttons switch one input or both inputs to both main channels. Tone cancel button to cut out all filters and tone controls for a perfectly flat response. Tr,vo tape outputs which can be switched to r l e l i v e rl n t h e l a n e m a c h i r r e e i t h e ra s pref'ectly flat signal or the signal after nassins lhrorreh lhe tone conlrols and filters. Tape preview inputs allow recorded signal lo be hlard through main amp rthiJe recording proceeds from any input l h r o u g h t h c p r e - a m p s e c l i o n .C a t e r s for tr,vo tape machines. Pre-amp output and power amp input linked on rear panel for connection to a graphic equaliser.There is aiso an additional pre-amp output so that other por'r'er amps may be driven. Inputs and outputs on phono sockets;
on speakers 4mm terminal Post.
1. Build the t\\'o 50W Amp kits as described on page 16 of this leaflet, follou'ing the construction details up to the end of the first paragraph. 2. Build the two BW Arnp kits as shown by the printed pcb and by the parts list on page 16 of this leaflel. 3. Put all the lvire links in the two mother boards using the 1mm svstoilex to insulate Iinks that are close together. 4. Solder in the four 6-u'av Wafercon plugs on the mother boards, and the two resistors .. 5. Fix the latchsrvitches to their brackets. Cut the 6-rvay latchbar into two 2-lvay pieces and discard the rest, and cut a 2-wav piece from the 8-lvav latchbar and discard the rest ln the 6-lr,ay bracket fix 'l-pole latchswitches in positions 1 to 4 and the trvo 2-pole latchswitches in positions 5 and 6, placing a 2-rvay latchbar under these trvo slvitches Slide one of the springs betrveen the brorvn and black plastic of the slvitch in position 6 so that the bottom of the spring presses against the righthand end of the latclibar. Carefully push fonrard the spring on both these su'itches and remove thc link from the top of each srvitch. Check that thcse two su'itchesinterlock rvith one another, then fit the switches to the pcb and bend over all the lugs to hold the srvitches firmll in position, In the u-u'ay bracket fit srvitchcs itt positions 1 to 7 with a latchbar u n d e r s l v i t c h e s i n p o s i t i o n s 4 a n d 5 , a n c l6 a n d 7. Fit springs to the rigirt-hand siclt:s o1 srlitches in positions 5 and 7 and remove the links from the tops of tlrese fbur sn'itr;hes, Check that .+and 5 interlock anrl that 6 and 7 interlock, each pair inciepenclent of the other pair. Solder to the pcb, then turn over the lugs as before.Finally mount the last 'l-pole latchsu'itch in one of the single latchbrar:kets. solcler tlie su'itch to the pcb and lurtr ovt:r tlte lugs as before, 6. Fix the eight PCB Cuides in position. 7. Press honte the singlc pip fixing pcb r:otrn e c t o r s ,b u t c l o n o t s o l i l e r t h e n r . 8 . l v l a k e t h e l l q u a l i s e r p c ; b ' s .F i t t h e u ' i r e I i n k s , the Wafcrcon ltlugs and the IC sor;kets.'Ihen f i t t h e r c s t o f t h e u r n t p o n t : r t t s{ e x c c p t t } r ep t ; b
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i'l rt,tl connectoisli:takinB great care to cnsure that 'lant and PC Elect capacitors are the Axial, inserted the risht u'ay round. Press home the double-pip fixing pcb connectors, but do not solder them. 9. Plug the Equaliser boards one at a time onto the Equaliser mother board and position the contacts so that they all make a good fit, then Ieaving the boards plugged together, solder all the pcb connectors. Remove that board and repeat rvith the other board. 1O. Make the trvo Selector pcb s. as described in paragraphs 8 and 9. 11. Make the twoPeak Detector pcb s. Fit the,wire links. lhe Wa[ercon plugs and lhe lC sockel. Fil lhe resl o[ lhe.components taking greal care to eri5ure that the Axial and PC Elect capacitors'and zendr diodes arc inserted the right rvay rbund. Temporarily, Ioosell' bolt these boards to the Selector pcb's using the tn'o 68.4. %in. bolts, trvo 68A nuts and trvo 68A spacers fi in. for ear;h board. 12. Maketheporversupplypcbrvithtbeaidofthe photograph. Fit the pins then the rest of the components taking great care to ensure lhat the PC Elect capacitors, and diodes are the right u.ay round. Bolt the 50W Hi-Fi Heatsink to the pcb using tn'o 68,4 1/:in. bolts, two 68.4 nuts, trvo 68A u'ashers and trvo 68.4. shakeproofwashers. Fit the three pou'er lransistors. 'l'hermafter smearing the mica u'ashers with path (from the 50W Amp Kits). The thick Washers supplied u'ith the Kit T0126. fit betrveen.the top of the power lransistors and the nuts. The mica lvashers fit betu'een the backs (the side rvith the metal plate) and the heatsink. To bolt them up use three 68A l,'2in. bolts, three 68,{ rvashers and three 684 nuts. The leads ofthe powertransistors will need to be extended and sheathed rvith systofle-x(see : photographl. 17. Mount the terminal posts, red at ihe top, then black, therrrred, and then black at the bottom. Mount thb'green post next to the phono socketg\liUS remove lhe rear insulation so tlrat th6'ifirital thread and nut are in contact n i[h the chassis.
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clips and bolt them into the chassis using eighl 4BA r'2in. countersunk scrervs, eight 4BA nuts. eighl {BA u'ashers md trvo 4BA tags. Bolt the ciips together ruith '1BA r/uin. bolls, nuts and rr ashers. 23. Mount the transforrrer so that tag 1 is close to
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18. Mount the fuseholders and mains plugs and sockeis. The mains inpul sockel needs two 68A 1iiin. countersunk scres's, nuts and shakeproof rsashers.
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F2 using six 4BA %in. countersunk scren's, and six 4BA nuts and rvashers. Fix the four feet using four bolts 2BA %in., four 2BA nuts and four 2BA shakeproof rvashers. Also on the screrv nearest the transfomer, fit a Tag 2PA. 24. Fix the equaliser mother board using four No. + tizin. self:tappers to hold the tu'o laichbrackets at the front and three 684. 1in. countersunk scre\\'s at the rear. On each screrv l r i n a n d a 6 8 A s p a c e rf b i n . ;rut a 6B-\ spacer a n d 6 a a . r r - a n r t m d $ a s h e r6 8 A . 25- ' FLx the slrctor mother bmrd using trvo No. 4 1zin. self-tappers to hold the latchbracket anii four 68A 1 in. countersunk scrervs al the rear. On each r..s1v put a 68A spacer %in. and a 68A spacer %in. and finally'a nut and rvasher 68A on each screrr. The four pluggable boards niay be renor-ed at any time to make fixing and tt iring ea5ie1. 26. Fix the PSU boarC to ihe chassisusing trr,o 4BA 1iin. countersunk scrcu's and tuo 4BA nuts and tr aslter-. 27. The fixing holes in the BW Amps are those nearest the ends. Before fixing, screrr a selftapper \o. 8 1:in. into each hole to cut a thread. Remove the screws and deburr the holes rrith a small file. Place the t$'o amps roughlv in position, but to help n'ith the n.iring. don't screw them in yet. 28. Place the 50W Amp kits in position. but to help s ith the n'iring, don't bolt them in 1 et. Ther rrill require ts'o 4BA %in. countersunk bolts and trvo 4BA nuts and rvashers each. 29. Bolt the metal screen into position using fir'e self-tappers No. + /ein. 30. Roughlypositionatag (calledtag4on Fig. 2l
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13. Remove the lC s tromtheirprotectivepacking rvhere applicable and plug them into the lC sockets in the appropriate positions. 14. Fit the tu'o jack sockets to the bracket and fit the bracket to the front of the chassis, using three self-tappers No. 4, %in. Fit a grommet in i.,. thehole in the chassis through rvhich the LEII lrylll pass, 15. Wire the three resistors to each jack socket as sno\\'n ln r lg. J. 16. Mountthe fourphono socketstripsontherear panel using 24 68A %in. bolts,24 68A nuts and 72 68,{ n'ashers (3 on each screu', tn'o betu'een the fiont chassis and the paxolin and one betu'een the nut and paxolin). Fix iu'o 6BA solder tags, ene behind a top screrv on each ofthe trvo socket strips nearest to the end T s o f t h c r . h a s s i s . h e s r . a r e h o u n a s l a g s5 a n d 6 'W' on Fig. 1. on panel
the five potentiometers, the rotar]' switch and the two remaining grommels on the front of the chassis. On P4 md SW1, put the shakeproof washer under the nut. On P1, 2, 3 and 5 discard the shakeproof rvasher. 20. Momt the mains latchslvitch in the remainirig single latchbracket, bend over the lugs then fix to the chassis using tlvo self-tapper No. 4 t/zin.
1 9 . Mount
31. Nou' follow the rviring chart (Table 1 ). 32. Fix the posrer amps, headphone amps and re-fix any olher parls remored lo assistwith the n iring, 33. Cut the spindles of SW1 and P4 to 23mm and P1, 2, 3 and 5 to 24mm.
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27. Referring to Fig. 4, solder about 100mm o{
l8swg strapping wire to transformer tag 1, link tag 2 to tag 3 with slmpping wire, solder about 100mm of l8swg strapping n'ire to transformer tag 4, and connect about t1:m of hook-up wire to tags 5 to 13, violet to tags 5 and 7, white io tag 6, grey to tags I and 10, brown to tag 9, yellorv to tags 11 and 13, and black to tag 12. 22 Fix capacitors C77,7a,83 and 84 in the four
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3 4 . Snap the chromed buttons on to the latchsn,itches. 3 5 . Snapthe Cliplite red into the mains indicator hole on the front panel.Put a 4BA spacer fain. and a 4BA spacer7sin.on eachofthe six studs rear of the iront panel, and fix the front on the panelto the chassis using six 4BA shakeproof washersand nuts. Sndp the mains indicator LED into the Cliplite red. 3 6 . Push the two peak overload detectorLED's through the hole in the front panel untii the front of the LED is flush with the front of the front panel,then gluethe systoflex the LED on leads to the rubber grcmmet to hold it in position. 3 7 . Put the knobs on the spindlestthe largeknob is for the Volume controlP5.
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42. Follou, paragraph 2 of the construction details of the 50W Amp on page 16 of this leaflet. HT2 is pin 2 on Fig 1 in this leaflet. 43. Connect the pre-amp to power amp links and connect the loudspeakers. 44. Connect signals to all the inputs in turn and check that they all function correctly- The presets VR1 to VRg set the pre-amp inpui and output levels and are providecl so that as you switch betlveen the different input equipments (rvhich usually have all dillbrent levels) the main volume control does not have to be readiusted each time. The presets control the imputs as follorrs: VR1 Sets volume of the magnetic pick-up rnput. VR2 Sets volume of the tuner input. \R3 Sets volme of the tape one input. \R{ Sets lolume of the tape two input.
VRS Sets volume of the auxilliary input. VR6 Sets volume of the tape one output. VR7 Sets volume of the tape trvo output. VR8 Setsvolume oI lhe lapeone previeu input. \rRg Sets volume of the tape trvo previe$' input, Don t forget to do this for both channels. 45 Connect a pair of headphones and adjust \rR1 1 on both channels to give a suitable output le|ei. 46. A d j u s t V R 1 0 o n b o t h c h a n n e l s s o t h a t t h e peak overload detector LED's light rvhen distortion is heard on loud transients. Turn down the input presets if this happens verv much on an!' input. 4 7 . Fix the cover to the amplifier using four selftapers No. 4 l/zin.
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38, Turn preseis VR1 to VR11 on both channels to their centre point. 39. Fit all the fuses, F1 is 1A, the rest are 2.4. 40, Connect two phono plugs together for the pre-amp to power amp link on one channel so that there is approximately 50mm of Cable Single between the plugs, then repeat for the other channel. R12 on both 50W Amp PCB's fullv 41. Tm clocks ise. Srritch on the ampiifier. Conneit the leads of a voltmeter switched to DC volts to the pon'er supply pcb as follows and check that the vohages are correct to within plus or minils 1\'. Black lead to
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Pin 20 Pin 20 Pin22' Pin10 Pin 11" Pin 13 P i n1 2 -
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KEY;oos.(lrt r pEAK A. sELEcToR DETECToR cllnull)
sos d DETEcToR(ntclr cglulet-) B. sErEctot PEAK so. C' EouAttsEc(r:rr cHlxlrf eo. D' eeumtsse (crcttrcllnml)
E.5ow [FFt AMP8D. F' Sow ttt-Ft AMP 8D. G = 8W lll-R AMP.BD. lf . Bw nFfl AMPBD. J= p.s.uBD. K= TRANSFORMER,.
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FRONT PANEL
il.B. POTS, DESIGI{ATED'E, TO APECLOSEST CHASSrS
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(c78) R= crPActTOR BD. 5. gquAltsgRMoTHER BD. T. sglgctoR MoTHER To V' Au.cot{NEcTloNs ' (EXcEPT Pors.) IO CONNECTIONS V.I' ALT
REAR PANEL. 5KT5.wlTH Mole + = lvAFgRcoN r[AN oNEwt{t corlNEcTroN, FRONT PANEL
oN Pili FIG4 Sllowni6 !t'[os. TRANSFORMER..
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TABLE I
This table shows all the wiring required in the amplifier. The table must be used in conjunction with Figure 1, which explains the designationsused in colums 1 and 2, and Figure 2, which explains the designations used in column 4. For example, W40E is the earth tag on AC O7L z. Since it is important that the interwiring crosses amplifier in the correctplaces,Fig. the 2 shows where the wires ar,eto be run. Throughout the amp for screene"d cable,use CableTwin splitinhalf and this is den;ted belowasT CableTwir. Where a screen is maked '-', it must not be comected, but cut back and i n s ul a t e d . Run Wire Type of Wire Cable From To route W40E W41E Strapping Wire 18swg + Systoflex2mm Green W41E W42E StrappingWire 18swg* Systoflex 2mm Green W42E Tagl StrappingWirelsswg+ Systoflex2mmGreen K14 Tag 1 Q5 QZ Mains Trans Supp t\fDRl) * Systoflex1nm Red W42L Q3 Brown \ _ w42N c j + B l u e J T w i n M a i n sD S W38a Brown \ Q2 w a o N B l u e / T w i n M a i n sD S cjs W40N K4 StrappingWire lgswg + Systoflex1mm Black W38b W38b W42N W42L W3Sb KZ K5 K6 K7 K10 KB Ke w34b w35b w36b w37b K13 Kl1 K72 L2 M1 N2 R1 L7 L2 M2 N1 N2 R2 V6a v6b Vsa V6c K1 W40L W41N W39a W41L K3 W34a J15 W35a W36a W37a 18 I1B 117 16 t5 11 12 14 M1 Tag2 R1 Tag 3 116 J13 112 17 l7O 11 VOd v6d V6d VSd Strapping Wire 18swg + StrappingWire l8swg * StrappingWire lBswg * Strapping Wire l Bswg 4 StrappingWire 18swg+ Strapping Wire lBswg Wire 10M Violet Wire lOMWhite Wire 10M Violet Wire 10M Grey Wire 10M Grey Wire 10M Brown Wire 10M Violet Wire 10M Violet Wire 10M Grey Wire 10M Grey Wire lOMYellow Wire 10M Yellow Wire 10M Black StrappingWire 18swg Strapping Wire 18swg StrappingWire 18swg StrappingWire 18swg Wire 10M Red Wire 10M Black Wire 10M Yellow Wire 10M Red Wire 10M Black Wire lOMYellow AB AB B B BA BA BA BA BA BA BA BA Systoflex1mm Red Systoflex 1mm Red Systoflex 1mm Black Systoflex1mm Red Systoflex 1mm Red P24 121 D3 C3 822 122 D1 C1 B25 I19 J23 P5a1 P5a2 ps;i P5b2 Psbl P5a3
F 2 4 Wire 10M Black F^24 Wire 10M Black D3 C3 822 A22 D1 C1 825 A25 V4a V4b P5b1 D16 ni C16 c17 W24a
WlBa wiBb
CE AC CD DC CE AC CD DC CE
Wire 10M Ormge Wire 1OMOrarge Wire 10M Orange Wire 10M Ormge Wire 10M Blue Wire 10M Blue Wire 10M Blue Wire 10M Blue Wire 10M Blue + Systo{iex 1mm Yellon on V4 end WirelOMPink+SystoflexlmYellou'onV4end StrappingWire 18swg Core ) .)cablerwin z ', s;;;^ i Core 1., r z c a h l eT w i n Screen] Core I ., v.
C C ABD ABD
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W6a W17a Core l W6b W17b Screen -i W12a W23a Core I W12b W23b Screen ,[ GO G5 H6 H5 Eg E8 Fg F8 P4/1. P4l2 P4/3 P4/2 P3a1 P3a2 P3a3 P3b1 P3b2
A
% Cable Twin % Cable Twin
CzO C19 DzO D19 C14 C17 D1.4 D1,7 C18 C19 D1B D19 D11 D13 D10 D13 D1.2 D13 C11 C13 C10 C13 C72 C13 CO C5 Cg C7 C4 C8 D6 D5 D9 D7 D4 D8
Core Screen ) Core Screen ) Core Screen ) Core I Screen J Core I Screen J Core Screen ) Core Screen ) Core ] Screen t Core Screen ) Core Screen ) Core \ Screen J Core Screen ) Yellow Black Red Green White Blue Screen Yellow Black Red Green White
Hllle Screen
% Cable Twin % Cable Twin % Cable Twin % Cable Twin
BAC BAC BAC BAC
% Cable Twin 7z Cable Twin % Cable Twin % Cable Twin 1z Cable Tu'in 1z Cable Trrin % C:ble Twin % Cable Twin
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w29 w33 w28 w32 W29 wzA W33 w32 L1 L1 L2 L2 M2 M2 N1 N1 N2 N2 R2 R2 I2o Jzo i3 H1 G4 H4 G3 H3
ResistorR106 * Systoflex1mm Red ResistorR104 * Systoflex1mm Red ResistorR105 * Systoflex1mm Red Se Fig. 3 ResistorR103 + Systoflex1mm Red vsd ResistorR101 * Sysioflex 1mm Red vsd ResistorR102 * Systoflex1mm Red W27 Strapping Wire 18swg + Systoflex1m Black w 3 1 Strapping Wire 18swg * Systoflexlrnm Blacl w 2 6 Strappiirg Wire 18swg + Systoflex1mm Red w30 Strapping Wire 18swg + Systoflex1mm Red E3 Wire 10M Black E4 Wire 10M Red F 3 Wire 10M Black F4 Wire 10M Red Wire 10MRed F1 Wire 10M Red F2 Wire 10M Black F3 F7 Wire 10M Black F5 Wire 10M Yellow F6 Wire 10M Yellow E 1 Wire 10M Red E2 Wire 10M Red E3 Wire 10M Black E 7 Wire 10M Black E5 Wire lOMYellow E6 Wire l0MYellow H2 G2 H1 G1 H4 V6b V6d V5d Wire 10M Black Wire 10M Black Wire 10M Violet Wire 10M Violet Wire 10M Green Wire 10M Green Wire 10M Grey * Systoflex4mm Red Wire 10M White a Systoflex4mm.Red Wire 10M Black Wire 10M Black
P2a1 P2a2 P2a3 P1a1 P7a2 P1a3 Tag 4 P2b1. P2b2 P2b3 P1b1 P1b2 P1b3 Tag 4 V1a 819 820 V1c 419 A20 v1/7 v7/2 v1i 3 v] /4 v1/5 v1./7 vl/8 v1l9 vl170 v7171. T1 T2 T3 't4 T5 838 A3&
Multicore
6-lvav * Svstoflex 2mm Grn
Multicore 6-u'ay * Systoflex2mm Grn
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AB AB AB AB AB AB AB AB AB AB AB AB AB AB AB
821. V3a V3b A21, YZa Vzb T8 T11 T1.2 T9 T10 T77 T't4 T13 T16 T15 51 52 53 s4 55 B3A ,{31}
Wire lOMYellow Wire 10M Grey * Systoflex1mm Yellow on V3 end Wire 10M Gm * Systoflex1mm Yellow on V3 end Wire 10M Yellow \\'ire 1OMGrey + Systoflex1mm Yellow on V3 end Wire 1OMGrn * Systoflex1mm Yellow on V3 end Wire 10M Brown Wire 10M Pink Wire 10M Violet Wire 10M Red Wire 10M White Wire 10M Brown Wire 10M Pink Wire 10M Violet Wire 1OMRed Wire loMWhite Wire 10M Red Wire 10M Brown Wire 10M Black Wire 1OMBlue' Wire lOMViolet Wire-1oM Brown Wire 1OMBrorron
C C C E E E CD CD CD CD CD CE CE
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832 831 830 829 828 432 A31 430 1.29 A28 817 818 1.17 A18 811 81.2 All 1'72 813 81.2 A13 A1.2 81.2 A1-2 816 Eis
833 834 835 836 837 A33 A34 A35 A36 A37 W72a W72b W6a W6b W19a W19b W13a W13b W21.a W21b W15a W15b B15 A15
Wire 10M Blue Wire lOMGreen Wire lOMYellow Wire 10M Orange Wire 10M Red Wire lOMBlue Wire 10M Green Wire loMY;llow Wire 10M Orange Wire 10M Red Core I
Screen Cnrp / \
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w16b Screen J w?a Core I w20b Smn J W14a Core \ w14b Screm -f
Wsa Web W8a w8b W3a W3b W2a W2b W7a W7b W1a W1b Core I Screen / Core I Screen / Core I Screen / Core I Screen / Core I Screen / Core l Screen /
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Tips on Soldering
Soldering: the correct way
One of the most common causesof faults i n h o m e - m a d ee l e c t r o n i ce q u i p m e n t i s p o o r soldering. I Always use a goott soldering iron. If you can only aiford one iron we recommend the X25 be your first choice. If you are going to do a lot of fine work you may flnd it quicker to use the CX iron. The bits supplied for use with these irons are ironclad for longer lit'e, neverthelessthey do wear out and as soon as they become pitted they must be replaced. With averageuse they should last 3 to 6 months. Never file them as was done with the old copper bits or they will quickly disintegrate. Instead keep them clean by wiping them (when hot) on a damp sponge. Keep the bit clean ali the time you are soldering. Never allow llux to build up on the bit and do not work with a great lump of molten solder flowing around the tio. The tip should have a thin layer of solder on it at all times. When the bit is new or scrupulously clean the molten solder will form a blob on the tip;smooth it over the working surface with a piece of paper or cardRemember: soldering is not plumbing! The reason for soldering is.not to make an electrical connection, the solder is only there to give the joint rn"echanical strength and stop the joint tarnishing and con-
sequenlly going high resistance.Never let the solder make the electrical connection, ensure that you have a good electrical connection before the solder flows around it. Thesolder will only flow properly if both sides of a joint are at the same high temperature. So when you solder to a p6b make sure you are heating both lhe wire and the track on the board. If you don't, the flux in the solder will flow around the joint insulating it and preventing the solder doing its job. The result is a 'dry-joint'. , Always use a modern multicore solder s u c h a s D 6 2 2 . I f t h e s o l d e rw i l l n o t ' t a k e ' , clean the parts to be jointed with a grease solvent. If this is no help you either need a higherwattage iron or the materials you are trying to solder will not join using a standard lead/tin solder. When ]rou solder use the solder sparingly. You only need enough to cover the joint. On pcb's it is rarely necessaryto apply the heat fbr more than two secondsat the outside. Apply the iron then the solder. As soon as the solder flows remove the iron then take the solder away. Good soldering is a skiil that must be learned. If you bear in mind all the points above you will soon be making good solid joints every time you solder.
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FOR DETECTOR BD. CIRCUIT DAGRAM PEAK
Parts List
PowerSupplyPCB R87,88,93 S t d R e s8 2 0 0 R89, S0 Std Res39O R91, 92, 94, 96 Std Res22oO R95 W/WMin3.9O R97, 98, 99, 100 1W Res4k7 Identifying Marb Grey Red Brown Gold Omnge White Black Gold Red Red BrownC,old 3Rel Yellow Violet Red C,old
Min Res
c67,62,63,64,73, 74,75,76,75,80, 81,82 Fry Disc 1o,0o0pF c65,66 PCElect1000pF25V c 6 7 , 6 8 , 6 9 ,7 0 , PCElect 1O0;.rF 25V D2;3,4,5 1N4oo2 D6,7,8,9,10,11, 72,73 1N5402 2D2,3 BZY88C16 ZD4 BZYB8C13 8C337 Q 5 ,e BD131 Q6,10 E,C327 Q7 8D132 Q8
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Also required 3 Kit T0126 2J Pins2747 1 50W Hi-Fi Heatsink 1 Hi-Fi Amp PSU PCB 5 Bolt 68A 7zin.
Oxide
12
5 5 2 2 2 2
NUtOBA Washer 68A Sha-keproof Washer 68,{ C/S Screw 4BAlzin. Nut4BA Washer 4BA
Equaliser PICB (Two identical boards required) R63, 73 R64,75 R65 R66, 77 R 6 7 , 6 8 ,7 6 R69 R70,71 R72,7a,A4,85,A6 R74 R79 R80 RB1 R82,83 \rR11 Min Res68k Min Res27k Min Res15k Min Res 10k Min Res4k7 Min Res 100k Min Res 6kB Min Res2k2 Min Res 1k2 Min Res1k Min Res 270f,) Min Res22Gf) Min Res10f) Vert S-Min Preset47k Cirbonate O.012rrF C,arbonate 0.047pF Tant22pF 25Y Cubonate 1pF CarbonateO.12;rF Polystyrene680pF Polystyrene330pF Carbonate0.06BpF Ceramic 1OpF Tant 22;rF 16V Polystyrene 220OpF Carbonate 0.015pF Axial 22OpFf;\'3 Polyester 0.1gF PC Elmt 220pF 16\' PC Elect lfi)pF lOY Equalisr Pot Core BZY88C6V2 4016BE 40668E, 4136
FX2240 Red Violet Orange Gold Brbwn Green Orange Gold Brown Black Orange Gold Yellow Violet Red Gold Brom Black Yellow Gold Blue Grey Red Gold Red Red Red Gold Brom Red Red Gold Brown Black Red Gold Red Violet Brown Gold Red Red Brown Gold Brown Black BlackCold 47k 72n25O 47n25O Grey spot ifunmarked 1p 100 p1225O 680 330 68n 250 1op Green spot if unmarked 2200 15n 250
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W/W Min (2 types)
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c38,47 c39,41,44 c40,43 c42 c45 c46 c4a c49 c50 c51,53 c52 cs4 c55,56 C 5 7 ,5 8 c59,60 L1 2D7,8 ICg,11,12,13 IC14 IC10
lWRes
Brorln Black Yellorr Black Red
Also required 6 DIL Socket14-pin 2 lVafercon Plug 3-pin 1 Wafercon Plug Gpin 1 Wafercon Plug 8-pin 2 Wafercon Socket 3-way 1 Wafercon Socket 6-way 1 Wafercon Socket 8-way 20 Wafercon Terminals 17 PCBConns45" 1 Hi-Fi Amp Equaliser PCB Equaliser Mother s w 8 , 9 , 1 0 ,1 1 , 72,73,14,15 Board latchswitch4-pole
Preset
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Also required 1 Wafercon plug6-pin 1 Wafercon Socket6-u'av 6 Wafercon Teminal 17 PCB Conns Vertiml 1 latchbracket 8-wav 1 Latchbracket.Single 4 PCBGuides 1 Hi-Fi Amp Equaliser Mother PCB 3 C/S Screw68,\ 1in. 3 Nut68A 3 Washer68A 3 6tsA Spacer/+in. 3 68A Spacer%in. 4 Seff{apperNo.4lzin. 8 Latchbutton Round Chrorrre Peak Detector Board (Two identical boards required.) R51 R52,53 R54 Rss,57 R56 R5B R59,60 R61,62 VRlO c27 CzB Min Res150k Min Res1O0k Min Res3k9 Min Res10k Min Res1k Min Res560O Min Res 10O Min Res2k2 Vert S-Min Preset1OOk Polyester0.47pF PC Elect10pF35V
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Ceromic
Identifying Marks Brou'n Grmn Yelloll Gold Brown Black Yellorv Gold Orange White Red Gold Brown Black Orange Gold Brown Black Red Gold Green Blue Brown Gold Brown Black Black Gold Red Red Red Gold 100k Yellow Violet Yellou. White Rerl
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c29,3't,32 c30 c33,3.1 c35,36 c85 zD'|,5,6 Q4 IC8
Polyester 0.1pF Axial 220pF40V PC Elect220pF 16V PCElect 100trF10V PC Elect 1pF 100V BZYBBC6V2 BC337 pA741C9-pinDIL
Brorvn Black Yellow Black Red
Polystyrene
lso required DIL SocketB-pin WaferconPlug 3-pin WaferconPlug 4-pin Wafercon Socket 3-lvay Wafercon Socket4-way Wafercon erminals T Bolt 68A %in. Nut 68A 68A Spacer/ain. Hi-Fi Amp PeakDetector PCB
Selector PCB {Two identical boardsrequired) R7,4,27 Oxide4Tk
R2,30 R3 Oxide 82k Oxide 820k Oxide 1kB Min Res68O Min Res220k
Identifuing Marks Yellolv Violet OrangeRed Grey Red OrangeRed Grey Red Yellow Red Brorvn Grey Red Red Blue GreyBlackGold RedRedYellow Gold Red Red RedGold Bpw-n Black OrangeGold Yiillow Vioiet-@nge Gold Brom Black GreenGold Brown Gieen Omge Gold Blue Grey.OrangeGold Red Violet B,mrrvnGdd GreenBlue OrangeGold
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R6 R7,35,3B R8,72,76,20,24, 3 3 ,3 4 ,3 6 ,3 7 ,4 3 , 47,50 Min Res2k2 '13, R9, 1.7 21. 25 Min Res10k , , R 1 0 , '4 , ' ta , 2 2 , t 41,,45 Min Res47k R 1 1 ,1 5 ,1 9 , 2 3 , 2 6 , 42,46 Min Res1M R31,32 Min Res15k R39,40 Min Res68k R44,48 MinRes 270O R49 Miri Res 56k VR1 v R z , 3 , 4 ,5 , 6,7 VR8,9 : Vert S-Min Preset 470O Vert S-Min Preset100k Vert S-Mit?resit zzok
PC Elecl
Axio.l
C1 Axial 220pF 16V c2,6,8,1.O,72,14, 22,24 Carbonate 1pF C3 1|o Polystyrene 750pF 1/o Polystyrene C4 4700pF t,J 1/o Polystyrene 1B00pF C7 Axial 2204rF tiV3 c9,11,13,15,18, 20,23,25 Ceramic8.2pF c1.6,L7 Ceramic3.3pF c79,21. Tant 10pF 16V c26 Tant 22;rF16V BC1O9C Q1 2N5458 Q2 MPSA14 Q3 I C 1 ,6 4 13 6 1C2,3,5,7 401688 TC4 LM3O1A Also requircd 6 DIL Socket14-pin 1 DIL Socket8-pin tl WaferconPlug 3-pin 2 WaferconPlug 4-pin 4 Wafercon Socket 3-way 2 Wafercon Socket4-way 20 Wafercon Terminals 22 PCBConns45' 1 Hi-Fi Amp Selector PCB Selector Mother Board R28,29 Oxi'de47k s w z s , 45 , , Latchiwitch 4-pole SW6,7 Latchswitch2-pole Also required
3 3 l8 22 1 4 1 4 Waiercon Plug 6-pin Wafercon Socket 6-way Wafercon Terminals PCB Conns Verlical Latchbracket 6-way PCB Guides , Hi-Fi Amp Selector Mother Board C/S Screw 68A 1in.
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1p 100 750p 4n7 1nB
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8p2 3p3
MOVE DETENT SPRING -
ro sDE
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Lotchswitches
Identi$ring Marks
sICTION THRO
II.ISERT LEAF SPRNG N Et'n SWITCH
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sfr t{ous|xq
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Yellorv Violet Orange Red
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INsERT INTOSKT
WaferconP.lugs ond Sockets
lt is a good idea to mark one end ofeach plug and socket to ensure that reconnection is always made the right u'ay round
i4
Nut68A ' _Wasler,QBA ,
:'
6Bl{Spacer'/qin. 684 Spacer%in. '$rilf,tapper No.+ %in. LatchbuttonRoundChrome Identifying Marks BmmRedBrownGold Red Red GiikfGold 10n40V. : ; Brown rvtrliiteOrangeWhite
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7?l{EtMPATH
I{EAT9INK
Chassis Components R101,104 S t d R e s1 2 0 O : R102,103, 1 0 5 ,1 0 6 S t dR e s2 : 2 o C86 [2 required) Disc 0.01pF C77,7A,83,84 Can4700pF40V \rDR1 fr4ainsTrans Supp D1 (2 required) ' LEDRed D1.4 LED Red Pot Dual Lin 100k P't,2 Pot Dual Lin 22k P3 P4 Pot Lin 1k P5 Pot Dual Leg 10k SW1 Rotar Sn'6 SW16 trIains Latchswitch F1 Fuse20m 1A F2,3,4,5.6 Fuse20mm 2A Also required 2 StereoOpen Skt 1 Headphone Skt Bkt 2 A/P Beads 4 : Clip Can 35 3 Grommet Small 1 Latchbracket Single. 1 LatchbuttonChrome 5 KnobK105L 1 Knob K106L 6 Safuseholder20mm 1 Europlug 1 Eurosocket 13A Plug Nvlon t 1 1 Plug Fuse3.4 t 2 Mains SocketP650 2 Mains Plug P649 1 15/22V Power Tmn 2 50W Amp Kits '2 8W Amp Kits 4 Terminal PostRed 4 Terminal PostBlack 1 Terminal PosfGreen 4 Phono socket6:rvay 4 PhonoPlug Yellorv Hi-Fi Amp Chassis Hi-Fi Amp Front Panel Hi-Fi Amp Screen Cliplite Red HD Feet Hi-Fi CoverBlack 4 Bolt2B/'y2in. 4 Nut2BA 4 Shake2BA 1 Tag 2BA 4 Bolt 4BA %in. 18 C/S Screw4BA %in 28 Nut4BA 22 Washer4BA 6 Shake4BA 3 Tag 4BA 6 4BA Space%in. r 6 4BA Spacer/ain. 24 BoIt 68A 7zin. 2 C/S Smew 68A /zin. 26 Nut68,{ 72 Washer 68A 2 Tag68A 5 Selftapper No. 4 %in. 9 Self-tapper No. 4lzin. Self-tapper No. B %in. { 1m Systoflex1mm Black 1m SystoflexlmmBlue 1m Systoflex 1mm Grcen 1m SystoflexlmmRbd 1m Systoflexl'lmmYellow, 1m Systoflex2mmGreen 1m Systoflex 4mm Red 1 reel Strapping Wire l Bsrvg 1 reel Strapping.Wig 22su'g 60 Tie-Wrap 92 1pk Wire 11C 1 Double Bubble Sachet. 1m Multi-core 6-wdy 10m CableTivin 1pk SolderD622 1m Tlvin Mains DS 2 m M i n M a i n sW h i t e t N o t s u p p l i e dr v i t h k i t
MICA WASl|IR
MOUNTINA KrT T0t26 OF Transistors
(viewed from below)
cl
BClOgC 8C141,8C161
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BCI82L
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8C327.8C328
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MPSA74
8D137,P]132 8D139,B]140
8D711,8D712
lo
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ZTX3O4
ol
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\o I GATE
2N5458
I
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Diodes
-,BZX67--,7N 400 7N 540 BZY 882, 2
Integroted Circuits
(viewedfrom above)
SUPPLY VOTIAGE OUIPUI otouN0 I N V E R T I N GI P U T I i l O N J N V T R T I N Oi P U T I
:
1"N,f383 I^4301A, A741C 1t
i,
15
4016,4066, 4736
SOWAmpKit
Your 50W Amp Kit should containthe following parts
KI
R2.4 li3. i 1 R5 R6 R7 R8 R9 R10 R12 R13 R14,"\7 R15,16 R18.19 R20,2't,,23,24 R2Z
t,l
Min Res 22k Min Res zkz Min Res 4k7 Std Res 1Bk Min Res 2200 MinRes10k Min Res1k Min Res470O N{in Res Bk2 Horiz S-Min Preset 2k2
c2,3 C4 C5 C6 c7.8 C9 c10,11,12 Q1,2,3 Q4 Q5 Q6 Q7 QB Q9,11 Q 1 0 ,1 2 ZD1 F1 L1
M i n R e s8 2 0 0 S t d R e s1 0 0 O S t d R e s1 2 0 O W/WMin 120() W/W Min 0.47O W/!V Min 1oO Axial 1OpF 3V 6 2 Ceramic 20pF A x i a l 4 7 0 p F1 6 V Ceramic100pF Axial 1;rF 63V Polystyrene 1000pF Polyester O.1pF A x i a l 2 . 2 p F6 3 V ZTX3O4 8C161 8C141 BC1B2I, BD13S BD14O BD7"I2 8D71.1 BZX61C4V7 Fuse20mm 2A ECWire 24swg(%m) 1 W R e s1 k
Identifoing Marks Red Red Orange Cold Red Red Red Gold Yellou, Violet Red Gold Brorvn Grey Orange Gold Red Red Brown Gold BronnBlackOrangeGold Brown Black Red Uold Yellow Violet Bronn Gold Grey Red Red Gold 2k2 Grel' Red Brolvn Gold Brou'n Black Brorvn Gold Bron n Red Brown Gold 120R R47 10R n22 n10 1000 Brorvn Black Yellow Black Red
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except Q6 to Q12. Put the heatsinks on Q4, 5. Boli the main heatsink onto the top of the pcb and test fit Qo to Q12. Cut suitable lengths of svstoflex and insulate the leads of the transistors. Smear the mica washers with thermpath, then bolt down the transislors. Form the leads of Q6 so that they hold the flat face of the transistor down touching the heatsink. Apply a blob of thempath to the flat face of the transistor before fixing. Follorr setting-up procerlure desr;ritredon lcaflet supplietl n ith 50W Amp
Kir.
uP
Also included: F/H 20mm Chassis 5OW i.Fi PCB H 50W Hi-Fi Heatsink Heatsink lip-On C P i n s2 1 4 1 Kit T0126 ttP Kit (PJPlas 2mm Systoflex Small Thermpath Bolt68A %in. Nut 68A Shake6BA Solder StrappingWire 24 swg .l0m Wire
I 2 4 1m 1 I I I 1pk 300mm 1pk
Note:
Thc heatlphone amp is rlesignerl for usc lith eltx;tretheadphonesanri is therefore VcrV SonsiliVe. Il Vou use aolt\llnliollal heatlphones t'oLt "ri-p r o b a b l v f i n . l t h e h u n r a n c i n o i s e i n t h e l t e a d p h o n e so b j e c t i o n a b l e T o t o t : 1 . . c l i n r i n a t e t l r c p r o b l e n r . t ; h a n g e R 1 t o \ l i n R e s 2 2 O K a n d - R 3t o l \ l i n R e r I r : both the BW Amp Kits.
Construction
F i r s t m a k e 1 , 1 .W i n d a b o u t 1 t i t u r n s o f e n a m e l l e d c o p p e r r r i r e t j g h t l y a r o u n d .1k, t h e n s c r a t c ht h e e n a m e l o i T s o l h a t t h e b a r e d c o p p e r the bodv ofa 1W Res c a n b e s o l d e r e d t o t h e l e a d o f t h e r e s i s t o r c l o s e t o t h e b o d l o f t h e r e s i s t o r .F i t the pins and wire links to the board, then fit the remalnin.-e conponents
8W Amp Kit
Your BW Amp Kit should r;ontain: R1 R2 R3 Cl C2 C3, .+ C5 IC1 Also included 1 I tt 3 3 N{in Rcs 18k Min Res2201) Min Res5.6() PCEIect 1t)pFli5\' PC Elect 470pF lfiV P o l y e s t e r0 . 2 2 p F PC lllect 10()0pF ltiV LNI3B3 Identifuing Marks Brorvn Gret Orange Gold Red Recl Bron n Gold Green Blue Golci Goicl
Construction
F i t a n c l s o l c l e rt h e p i n s t o t h e p c b , t h e n a l l t h e o t h c r c o n r p o n e n t s .t a k i n g e r e t o e n s u r e t h a t t h e P C E l e c t r o l y t i c s a r e i n s e r t e ctl h e r i g h t r " a r r o u n d . S o l d e r t h e I C t o t h e P C t st h e n s n r e a rt h e m e t a l t a b $ ' i t h T h e r r r p a t n f r o m t h e 5 o W A m p K i t s . B o l t t h e p c b t o t h e h e a t s i n k , t h e n b e n d t h t : I C c r re r a n d b o l t t h a t t o t h e : ,:: I I
Red Yellon Black Red + t6V
BlV lli-Fi Heatsink B!V;\nrp PCts P i r r s2 l - 1 5 Bolt.lBA r,,in. N L r t4 B r \
1979 supplrEs LTD. @ lalplrtt ELEcrRoNtc 't6
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