# 0-50V 2A Bench power supply I use the lm10 IC because it has a reference voltage and thats useful for dc power supply. With two ICs can take different output voltage and amperage. This circuit is protected from short circuit.P2 is for controlling the current at the range of 0-2A. Stabilize the output voltage with R4 on negative pin on op-amp and with R2 & P1 on positive pin.

Op-amp output controls T1 that not let ripple of voltage.T1 increase or decrease ampere of R6 and control the voltage of T5 & T4. Pin 1 is the reference voltage and reference voltage is losing some voltage on R1 that has 100uA . This current passes through P1 too.

Vlose p1=100uA*Rp1

This lose voltage regulate output voltage rate of output current is compare between reference voltage of P3 and lose voltage on R11.T3 is protecting short circuit with R11. For reduce out put voltage to 0v should parallel one resistor 470 ohm in out put. Minimum voltage is 0.4v. The maximum output voltage is fixed with R1b and should not become over of 50v. Therefore your transformer should give 36V, 3A with 4700uF capacitor. T6, T5, T7 need heatsilk.

### Parts list

R1a = 2,2 K
R2 = 10 K
R3, R7 = 3.3 k
R4 = 390 Ohm
R5 = 47 K
R6 = 3.3 K 1Watt
R8 = 180 Ohm
R9, R10 = 0.47 Ohm 3Watt
R11 = 0.075 Ohm 2Watt
R12 = 470 Ohm
P1 = 500K liner potentiometer
P2 = 4.7 K potentiometer
P3 = 10 K potentiometer
C1 = 1nF
C2 = 10nF
C3 = 22nF
C4 = 47mF 63v electrolytic
C5 = 4700mF 80v electrolytic
T1, T2 = BC161
T3, T4 = BD141
T5 = BD241
T6, T7 = 2V3055
D1, D2 = 1N4148
D3, D4 = 1N4001
IC1, IC2 = LM10C

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• Thank you a bunch for sharing this with all folks you really understand what

5 years ago
• kourosh

good

5 years ago
• Esinti

Bottom and cauldron PCB 🙂

4 years ago
• Jay Hughes

@ Esinti

HuzLireSim copied his from yet another source!

4 years ago
• Mar Laf

This is an old elktor design

4 years ago
• Pieter

Old Elektor design. I built this about 30 years ago, and I am still using it.

4 years ago
• Lautrec

Hi, how can to make from 2A to 30A.

3 years ago
• Paul

Few people know that.

2 years ago
• iSHF

Hello sir, how can to make from 2A to 10A or 15A,please?

3 years ago
• erik

any replacement for the LM10?

3 years ago 