C1 is a 10-47 uF electrolytic while Q1 can be a TIP41 (TO-220 case) or 2N3055 (TO-3 case). This is used to set the output voltage of the LM317. R1 is a 180 ohm half watt and R2 is a 5K ohm potentiometer. C2 is a 2200 uF 50 volt electrolytic that will charge up to almost 40 volts with a 25.2 volts. Diode bridge D1 should also be rated at 3 amps or greater and at least 50 PIV or greater. The one I used was rated for 25.2 volts RMS at 3 amps from Radio Shack. Please note that at low output voltages at high current Q1 can get very hot. Furthermore, both line and load regulation are better than standard fixed regulators.īy using a heat-sinked pass transistor such as a 2N3055 (Q1) we can produce several amps of current far above the 1.5 amps of the LM317. It is exceptionally easy to use and requires only two external resistors The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A overĪn output-voltage range of 1.25 V to 32 V. Build an Adjustable 2-30 volt power supply with the LM317
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