DC Power Supply with Variable Regulated Voltage

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1d 00:37:29

Linear DC power supply with regulated voltage.

Input is AC voltage (120 Vac rms @ 60 Hz).

Output is smooth DC voltage ( ~3.3 Vdc to 15 Vdc).

Steps:
1. Input is a US wall socket with 120 Vac @ 60 Hz. Transformer with 120:24 turn ratio steps the voltage down to 24 Vac.
2. Blue/Green- Diode bridge rectifier produces a rectified (positive only) voltage. 
3. Red - Filter capacitor smooths the rectified waveform into a DC voltage, but leaves some ripples (see the difference between max/min voltages at Red).
4. Orange - Voltage regulator circuit smooths out the ripple and produces clean output voltage (see the smaller difference between max/min voltages at Orange).

Change the pot to vary output voltage from ~3.3 Vdc to 15 Vdc.

Change the filter capacitor value to a smaller value (400 uF) to really see the smoothing power of the voltage regulator circuit.

For more info on how these work:
http://en.m.wikipedia.org/wiki/Power_supply#DC_power_supply

The voltage regulator circuit was designed by N1HFX. See all the great info for this design at: www.rason.org/Projects/discreg/discreg.htm

published 10 years ago

rocketeeter

10 years ago

Give the circuit a few seconds to even out. Change the potentiometer wiper position on the right of the circuit to vary output voltage from ~3.3 Vdc to 15 Vdc. Note that the 120 Vac is an RMS (average ish) value so the amplitude is 170 Vac.

PeacePeace

10 years ago

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