Text preview for : Oberheim-PS1PhaseShifter.pdf part of GuitarEffects Various 56MB,443files,17parts(WinRar)
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-15 +15 100K 10K 100K 10K
4.7K 1M 2N4302
10K
IN
0.33uF
10K 10K 33K -15 4.7K 100k 100k 100k 7 3 0.01uF 100k 100k +15 8 100k 7 3 0.01uF 100k 100k 100k 100k +15 8 100k 7 +15 +15 +15 2N4302 1M
4.7K
OUT
10K
4.7K
100k
100k
6 5
+15 8
2
6 5
2
6 5
2 3
+
+
1
0.01uF 100k
4 -15
+
+
1
0.01uF
4 -15
+
+
1
0.01uF 100k
0.01uF
4 -15 1M
100k
100k
100k
-15 10K
+15
Oberheim PS-1 Phase Shifter
+15 -15 100K 4.7K 1M 2 10K 220K 10K Medium Phase Fast Phase 3 150K 4.7K P1069C 1M 150K 10K 2N4302 1M +15 8 1 10K 0.33uF
selected
DC offset
6 5
+
+
7 4 -15 33K
-15 10K 33K FET Bias
10K
+220uF
33K Osc. Ampl.
+ 4.7uF
10K
-15
+15
10K
1N4002 (4X)
All IC's are 1458 dual op amp. All bipolars are 2N3638A.
270 (Pin 8 +15 0f IC's) 1N965
Blk AC Switch, Power Ind, Fuse 115 VAC Blk
Red Wht
+470uF
25v
+470uF
25v Grn 270
1N965 -15 (Pin 7 Of IC's)
Adjustment procedure: 1. FET Bias: With Osc.Ampl. trimmer fully counterclockwise, adjust FET Bias so that audibile phasing sound is in the middle of its range. 2. Osc. Ampl.: Adjust for desired depth of phasing sound. 3. Output Offset: adjust for minimum "click" when Off/Slow Phase switch is operated.