Old 04-10-2011, 09:12 PM #1
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Default I Need advice for stabilized power supply with current control

Hi,

I built this power supply with the intention to connect and test laser diodes, and I would like to hear your opinions.

Is acceptable - not acceptable, in short know your Suggestions.

Thanks.

Characteristics
Input Voltage: ................ 24 VAC
Input Current: ................ 3 A (max)
Output Voltage: ............. 0-30 V adjustable
Output Current: ............. 2 mA-3 A adjustable
Output Voltage Ripple: .... 0.01 % maximum

Components:

R1 = 2,2 KOhm
R2 = 82 Ohm
R3 = 220 Ohm
R4 = 4,7 KOhm
R5, R6, R13, R20, R21 = 10 KOhm
R7 = 0,47 Ohm 5W
R8, R11 = 27 KOhm
R9, R19 = 2,2 KOhm
R10 = 270 KOhm
R12, R18 = 56KOhm
R14 = 1,5 KOhm
R15, R16 = 1 KOhm
R17 = 33 Ohm
R22 = 3,9 KOhm
RV1 = 100K trimmer
P1, P2 = 10KOhm linear potentiometer
C1 = 3300 uF/50V electrolytic
C2, C3 = 47uF/50V electrolytic
C4 = 100nF polyester
C5 = 200nF polyester
C6 = 100pF ceramic
C7 = 10uF/50V electrolytic
C8 = 330pF ceramic
C9 = 100pF ceramic
D1, D2, D3, D4 = 1N5402,3,4 diode 2A - RAX GI837U
D5, D6 = 1N4148
D7, D8 = 5,6V Zener
D9, D10 = 1N4148
D11 = 1N4001 diode 1A
Q1 = BC548, NPN transistor or BC547
Q2 = 2N2219 NPN transistor
Q3 = BC557, PNP transistor or BC327
Q4 = 2N3055 NPN power transistor
U1, U2, U3 = operational amplifier
D12 = LED diode



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Old 04-10-2011, 09:34 PM #2
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Default Re: I Need advice for stabilized power supply with current control

I built this one too, it works but there are a few things wrong with it. It is not short circuit protected so you will blow the 2N3055 output transistor . There is a discussion about it on the forum part of the website with an updated schematic asuming you got it from the electronics lab site. I built the lcd multimeter for it but that only measures what current is being passed so it will be hit and miss to set the current limit without being able to measure it. It should be ok if you are powering the laser drivers with it but I would not directly power the diode with it

Last edited by Scoots; 04-10-2011 at 09:43 PM.
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