Regulated power supply, adjustable from 1.2 to 30V/1.5A using the ic lm317 use to substitute eliminator of piles and batteries in your circuits
This circuit power supply supply uses the integrated circuit LM317T, which allows to vary the output tension between 1.2 and 30V with currents of up to 1.5 Amperes. To be used as eliminator of piles and batteries in most of the applications.
Unlike complicated supplys with transistor, that is an excellent option for who wants an adjustable supply with means in the electronics stores.In the points AC you should tie a transformer of 24 volts(12 + 12) with a current capacity of for the at least 1.5 amperes, You until it can get a transformer of those in the scrap, what will reduce considerable the costs of the project.That supply cannot lack in the supported of the hobbyist, student, technician, finally who works with electronics. The only precaution that she should take, is to set up IC1 in a good dissipater of heat.
Modifications in the power supply with lm317
To have a fine adjustment of tension it uses a potentiometer of 220Ω in series with the pot of 4.7k.Call a voltmeter in the exit to determine the tension. Or use the multimeter. You can use two of those supply’s in a same box and like this to have a double adjustable supply. It can use that supply with tension it fastens, to feed certain equipment, example 17.8 volts for 1 Amperes. It is only to use a trimpot in the place of the potentiometer and to adjust the exit tension using a multimeter. It can use 2 or 3 LM317 to increase the current capacity for up to 4 amperes the resistors of 0.22Ω should be for 10 W or more.
Components to assemble the circuit for power supply:
- T1 – Transformer (110 or 220V) / 24V (or 12+12) / 1.5A or 2A.
- IC1 – Integrated Circuit LM317T.
- P1 – Rectifier bridge PBL405 or equivalent. Or 4 diodes rectifiers for 1.5A/100V.
- D1 and D2 – Diodes 1N4002 or equivalent.
- Led1– red Led
- C1 – CAPACITOR ELECTROLYTIC 3300µF 50V
- C2 – CAPACITOR ELECTROLYTIC 0.1µF
- C3 – CAPACITOR ELECTROLYTIC 10µF 50V
- C5 – CAPACITOR 0.1µF 50V
- C6 – CAPACITOR 10µF 50V
- R1 – Resistor of 2.2KΩ 1/8W 5%
- R2 – RESISTOR 220Ω 1W
- R2 – Potentiometer 5KΩ lineal.
- Several – printed circuit board, voltmeter, ammeter, box, heatsink for IC1, etc.
Suggestion for printed circuit board for power supply lm317
Pcb side of the components
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