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0.7-24V 2A Variable power supply circuit diagram

2014-11-07 13:48  
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This variable power supply circuit schematic is a simple power supply that give a variable voltage from 0.7 up to 24V and variable current limiting up to 2A.

15V variable power supply circuit using 2N3055 16V adjustable power supply circuit using TLC271 50-250 volts high voltage adjustable regulator TL071 symmetrical power supply circuit

With P1 potentiometer it's sets the maximum output current you want at a given output voltage and the P2 potentiometer it's used to set the output voltage and must be a logarithmic ,in order to obtain a more linear voltage indication.
The Transformer can be used for this supply must deliver : 36, 40 or 48V center-tapped and a power around 50, 75, 80 or 100VA. Capacitor C1 can have a value form 2200 to 6800µF.

0.7-24V 2A power supply schematic circuit
Components

NotationValue/DescriptionR1,R2
R3
R4
R5
P1
P2
C1
C2
D1,D2
D3
Q1
Q2
Q3
Q4
T1 2K2 1/2W Resistors
330 Ohm ¼ W Resistor
150 Ohm ¼ Resistor
1 Ohm 5 W Resistor
500 ohm Liniar Potentiometer
10K Logaritmic Potentiometer
3300µF Electrolitivc 50V
1µF Electrolitic 50V
1N5402 200V 3A
Led rosu 5mm
BC182 50V 100mA NPN
BD139 80V 1.5A NPN
BC212 50V 100mA PNP
2N3055 60V 15A NPN
Primar 220V , Secundar 36V cu priza mediana 50VA