Symmetric Power Supply 0-70V @ 5A – Update

I bought some bigger heat sink for cheap. (Thanks Ben and Robert). I have put those new heat sinks on this power supply. With this heat sink it doesn’t need a fan, because the ribs run in the other direction and the heat sink is much bigger. I cut 5cm of the case at the back and mounted the heat sinks. In the middle I’ve put a panel for the power connector and in the future a usb connector.

Nieuwe koelbloken

Nieuwe koelbloken

I also made a new switch pcb because I was not happy anymore with the old design. The triacs to switch the 230V side of the transformers are driven by an PIC12F629. I have put a low power powersupply on this pcb to generate 2*5V from the extra windings I made around the transformers.

Schema schakelprint V2

Print schakelprint V2

Partlist:

R1, R2, R3 220R
R4, R11 33K
R6 0R33 5W
R5 3K3
R7, R8, R9, R10 1K
C1 470µF 25V
C2 100nF
C3, C4 10µF 25V
C5, C6 1000µF 25V
C7, C8, C9, C10 100nF SMD 0805
D1 1N4007
D2 5V1
D3, D4, D5, D6 1N4007 SMD
B1, B2 rectifier
IC1 PIC12F629 (Code) (Hex)
IC2 7812
IC3 7912
K1, K2, K3, K4 Relays
LED1 LED 5MM red
Q1, Q2, Q3, Q4 BC848 SMD
T1, T2, T3 TIC206D

Print schakelprint V2

Print schakelprint V2

Print schakelprint V2

Print schakelprint V2

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