This is a circuit diagram of the circuit variable regulator, which uses IC L200, as regulator of voltage and current. Perhaps circuit diagram is somewhat different from the circuit diagram of power supply before. For this IC from SGS-Thomson company, which gives this series. This diagram circuit output voltage can be set, we also can set the output voltage current, with TR2 and TR1, respectively. More information about the characteristics for the L200, you can see on the sheet list. Will soon also be useful to add other specific circuit with L200. Circuit diagram using the LM741 IC, as a reinforcement, if compared with the previous article that uses transistors, then to the circuit this time has the advantage. You can use this power supply circuit in various applications. The following is a schematic drawing:

component :

R1=1Kohm
R2=470 ohm
R3=0.1 ohm 5W
R4=1Kohm
TR1=100Kohm pot.
TR2=10Kohm pot.
C1=4700uF 63V
C2=220nF 100V
IC1=L200
IC2=LM741

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