Simple LM317 adjustable power supply (with schematic), perfect for novice production

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I believe that every electronic DIY enthusiast will encounter a problem in the production of electronic small production, often can not find a suitable power supply and just got a headache, the general switching power supply has only one output specification. It is enough for the general use, but it is really pitiful for electronic DIY enthusiasts who want to slap the drums all day long. Although you can use a battery to connect in series to get the voltage you need, you can always lose power at critical times. Therefore, this simple and practical regulated power supply was produced.

Schematic

You can see that there are only a few very simple originals, simple! Rough! LM317 - may be in contact with every electronic DIY enthusiast, is a widely used series of integrated regulators. Its output voltage: 1.25-37VDC; output current: 5mA-1.5A; chip internal with overheat, overcurrent, short circuit protection circuit; maximum input-output voltage difference: 40VDC, minimum input-output voltage difference: 3VDC; wide voltage output Suitable for a wide range of occasions. The input AC power is full-bridge rectified by a rectifier bridge composed of D1-D4, and then filtered by C4 and C1, and sent to the third leg of the LM317. R1, W1, C3, and IC1 form a feedback adjustment network, so that the output terminal outputs a certain DC voltage. C4 and C5 are the output filter capacitors of the power supply. The power indicator light consists of R2 and D7. The current limiting resistor is R2. Diodes D5, D6 provide protection in the circuit.

material

LM317, 100Ω resistor-R1, 2K-R2, 5.1K adjustable resistor-W1, 1000μF-C1, 220μF-C3/C4, 104 ceramic capacitor-C2\C5, LED-D7, 1N4007-D1\D2\D3\ D4\D5\D6.

wiring

Wiring with hole board typesetting software

The welding can be used directly without any error. The following is a small series of their own production, the welder needs to be strengthened ~~

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