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Stepped Desktop Power Supply

Most of the times a fixed voltage power supply is very much required for quickly connect and test an electronic equipment.  Having bi-polar (both positive and negative) DC power supply is added advantage for working with op-amp circuits etc.

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The circuit of Stepped Desktop Power Supply is simple and easy to construct.  The input should be in between -18VDC to -21VDC for negative output voltage power supplies -3VDC, -5VDC, -8VDC, -12VDC & -15VDC. Similarly, the input should be in between +18VDC to +21VDC for positive output voltage power supplies +3VDC, +5VDC, +8VDC, +12VDC & +15VDC.

All the output Voltages are generated using fixed voltage regulator ICs, 7805, 7808, 7812, 7815 for positive voltages and 7905, 7908, 7912 & 7915 for negative voltages.  For +3V, adjustable positive regulator IC LM317 and for -3V, adjustable negative voltage regulator IC LM337 are used with resistances 330Ω and 220Ω for fixed voltage outputs.

Refer full circuit diagram: 

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Two berg strip sets are used on the PCB, for Positive and Negative Voltage outputs separately, for easy connection as per individual's requirements.

GOOD LUCK. ENJOY.