Electrical Characteristics (LM). (Refer to the test circuits. 40qC TJ qC, IO = mA, VI = 19V, CI = PF, CO = PF, unless otherwise specified). LCV LM L Voltage Regulator IC + 12V A. 78xx (sometimes L78xx, LM78xx, MC78xx) is a family of self-contained fixed linear voltage regulator integrated circuits. The 78xx family is commonly used in.

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This project is a simple variable power supply using the famous LM regulator IC. It consists of two boards, the main board which includes the regulator, capacitors, bridge rectifier and potentiometer and a second board that includes the mains tranformer, the fuse and a switch.

I designed this variable power supply which is based on the famous series of voltage regulator LM78xx. The electrical characteristics can be found here. LM78xx can be easily found in stores with electronic materials.


On this project I use the LM in TO footprint, which can be screwed to the rear of a heatsink for better heat dissipation. You will get better heat conduction if you use thermal paste lm781 the heatsink and LM78xx before screwed together.

The bridge rectifier is a classic 2KVV. You may choose the appropriate bridge rectifier according to your requirements.

The variable resistor R3 varies the output voltage Vout. The R3 can be placed in your project box and can be replaced with a potentiometer of similar price. The second board is for the transformer, the board i the base for the primary fuse and one on-off switch for V mains voltage. Now be honest Spili!

78xx – Wikipedia

Thanks for your comments. This has given me a start and is better then many others I have lj7812. If you can do better, create your own site! Everobody on the internet has copied it from somewhere.

7812 Regulator

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