I've recently built a very simple 12V/1A power supply using a UA7812 and very basic components. It powers my DIY speaker containing a TDA2003 amp pretty well !
Here is the components I've used :
-a 20v transformer (this one I got from an old casette player)
-Four diodes for the rectifier.Mine are big ones but anyone from 2N4001-2N4007 will do.
-A 2700uF electrolytic capacitor placed after the rectifier bridge.
-a UA7812 transistor.You can also use an LM7812 or any other 7812 transistor.
-a 100nF film capacitor to dump the high frequencies to ground.It is connected from the output of the transistor to ground.
This is a very basic power supply circuit with the minimum of components.
And that's about it.
Here is the schematic.
And here is a better version with 5volts or 12 volts.Same circuit as before with the addition of two components- a UA7805 (or any 7805 chip) and a 100nf film capacitor.
Important safety instructions.
 |
| Electric shock risk! |
This circuit uses high current from the mains supply (120volts or 230volts AC) which makes it dangerous.DO NOT touch the circuit or try to measure anything while it is connected to the mains.Put it in a box first.
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