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STEP_VARIABLE_dc_SUPPLY

2015-03-18 14:18  
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STEP_VARIABLE_dc_SUPPLY
Intended as a replacement for generally poorly regulated wall-type ac/dc adapters, this circuit offers superior performance to simple, unregulated adapters. Voltages of 3, 6, 9, and 12 V are available. The DPDT switch serves as a polarity-reversal switch. R2 through R6 can be replaced with a 2.5-kΩ pot for a variable voltage of 1 to 12 V. R7 through R10 can be replaced by a fixed resistor of about 1 kΩ if the LED1 brightness variation with output voltage is not a problem.