Variable power Supply scheme shown here is very simple, its used regulator IC L200 (ADJUSTABLE VOLTAGE AND CURRENT REGULATOR). L200 is a monolitthic IC for current and voltage programmable regulation. It has current limiting, power limiting, thermal shutdown, and over voltage protection.
Variable power supply based L200 for its output voltage is controlled by a variable resistor 10K. Output voltage range of values is from around 3 to 15 volts, and current range is about 10 mA minimum and a maximum of 2 amps. Exceeding current limit will reduce the output voltage to zero.
Variable power supplyParts list :
Resistors : 1 K, variable resistor : 10K, 47R
Capacitors : 4700 uF/ 16 V, 100nF (2), 10uF/16V
Regulator IC : L200
Transformer : 12 volt 2 Ampere
Fuse : 1 A
