Text preview for : HY3020 sch.pdf part of Mastech 3003, 3020 Laboratory power supply, various chinese manufacturers, like Mastech. These schematic apply for various models too, with different output currents, and digital or analog instruments. Specially useful for model 3020 and 3003.
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+12V 1 3 R1 430F/0.5W DW6 D1 1N4002 D2 1N4002 2 C1 220uF/25V C3 220uF/25V D5 1N4002 U1 Vin L7812CV GND Vout
K2
K1
D6 1N4002
K3 D13 1N4002
J2 2 1 J4 8 7 6 5 4 3 2 1 7 14 15 11 6 12 9 8 10
C4 47uF/25V
R2 10KF/0.5W
R3 470F/0.5W
11
WL431
R4 10KF
Q6 A708 R5 33KF R6 24KF
12
D3 1N4002 D4 1N4002 FAN+ C2 R?39J/5W FAN220uF/25V R7 560J/2W R8 1KF/0.5W -6V -15V D9 1N5408 D10 1N5408 DW1 6.2V Q3 2N3055 Q7 2N3055 Q8 C? 2200uF/16V 100F R98 R100 R102 2N3055 R10 10KF R11 100J/5W Q? 2N3055 Q1 C1008 F E D7A~G 1N5408 4 K3-2 K3-3 D8A~G 1N5408 Q2 D313 C6A~D 4700uF/63V DW2 D11 2.4V 1N4002 R12 1KF R13 10F/0.5W C8 100pF 6 LED1 5/RED 10 -6V C9 7 100pF 6 +12V U3 LED2 5/RED 2 3 PCB-HY3002D(1) C10 100pF -6V T-HY3020 11 C1* 104J/63V VR6 6.8K R23 HA17741 7.5KF 5 1 4 R? 560F B C7 7 U2 100pF 6 2 VR3 6.8K 3 8 PCB-HY3002D(1) HA17741 5 1 4 VR2 5K 9 VR5 200
R103 0.36J/5W R101 0.36J/5W R99 0.36J/5W Q8B R98B R100B R102B 100F 2N3055 (CUR+) Q7B 2N3055 Q3B 2N3055 R101B 0.36J/5W R99B 0.36J/5W PCB-HY3003(1) Q5 C1008 +12V R19 R18 680KF 10KF 4 7 Q9 C1008 R103B 0.36J/5W
13
PCB-HY3002D(1) (CUR-) VOT+ 15 PCB-HY3003(1)
18
1
C
R20 3.9KF
N1 19
D7 1N5408 2 3 C5 563J D8 1N5408
R22 3.9KF
R21 15KF
+12V
U4A 3 Q4 C1008 1 2 C12 LM324N 123J R24 10KF R25 11 C13 2.2uF/25V
R30 10KF R31
R32 3.9KF 680KF U4B 5 6 C2* LM324N 123J
R33 24KF
N1
5
7 2.2uF/25V
R9A~B 1KJ/5W
K2-3
C5A 563J D10A~G 1N5408 D9A~G 1N5408
A
8
K2-1
+12V LM324N R34 2.4KF C14 123J C15 12 PCB-HY3002D(1) 2.2uF/25V
R26 15KF
R35 15KF
9
C D K1-1 K1-2 K1-3
R36 10KF
R37 30KF
DW4 2.4V C11 1uF/50V PCB-HY3002D-3(6) Q10 A708
10
VR7 1K
DW5 15V 14
PCB-HY3003(1) VOT-
PCB-HY3002D-3 7 PCB-HY3002D2 FUSE1 T1A250V SW1 CS 6 1 2 3
1 N1 2 3 N1 4
MASTECH
AC IN
5 4
(1)
HMJ20001B32
A0
HY3020
2
R27 2.2KJ/2W
VR4 1K
8 9
D80 1N5402
B
K2-2
C81 104J/63V
VR1 10K
C80 470uF/63V
7
680KF U4C 10
C16
6
K3-1
-15V
1
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