This is a basic universal variable Power Supply voltage regulator circuit using an LM317, 3-terminal regulator in a TO-220package. The Universal Power Supply output voltage can be set to anywhere in the range 1.5V to 30V by selecting two resistances. By using a potentiometer, R2, as one of the resistors you can dial up the output voltage wanted.
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Reliable and stable a.c. and d.c. power supply for circuit breaker testing Continuously variable 24-250 V AC or DC output Separate outputs for close coil, trip coil and spring charging motor voltage
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