Dual power supply 3V,5V,6V,9V,12,15V with LM317,LM337

Here is the variable dual lab power supply circuit.You can select voltage levels are 3V,5V,6V,9V,12,15V at 1A
and -3V,-5V,-6V,-9V,-12V,-15V at 1A, use IC LM317 (for positive volt) and LM337 (for negative volt), Controls Voltage Output by S2 For +Vout and S3 for -Vout.
The transformer is 2A size. And the both IC holds heat sink.
Read detail more in circuit.

Next ideas,if you want to other voltage in variable voltage form e.g. 4.5V,7.5V,13V etc. You can add the VR1 in adj pin of the IC1-LM317 and IC2- LM337 look like to power supply regulator 1_2V-20V and 3V-6V-9V-12V 3Amp With LM317T and 2N3055

LM317/LM337 Calculator (IC Regulator)
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Power supply regulator 1_2V-20V and 3V-6V-9V-12V 3Amp With LM317T and 2N3055
This is Circuit Power supply regulator Current 3Amp Voltage output : 1.2V-20V and 3V,6V,9V,12V. Use IC LM317T and 2N3055, Easy to Bulid and normal part low cost too. detail see in circuit image. Related Links More Circuit about power supply regulator More circuit about Variable Reg ...
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