~12VAC to 12VDC Converter Circuit




Introduction: ~12VAC to 12VDC Converter Circuit

That's my individual idea :)

Step 1: Parts:

1N4007 diodes x4
470uF 25V electrolytic capacitor x1
stabilizer 7812 x1
fuse 150mA 250V or 600mA 250V x1
fuse socket x1
transformer ~220-230V 50Hz or 60Hz to ~12V/100mA x1
switch x1

Step 2: Video

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    7 years ago on Introduction

    I always like to use a bit more filtering myself. Other comments are valid here as well. For stabilization other capacitors are suggested. 0.33μF on the input and 0.1μF on the output. As close to the component leads as is practical. I can make a fixed regulator circuit, sans bridge, and primary filter, in about a half a square inch of circuit board area. I usually throw in reverse protection diodes too, because I have so many diodes kicking around. But they are very optional.


    7 years ago

    For good regulation with that 7812 chip, you need about 15v DC input. Ive played a lot with 78xx and 79xx series chips over the years. Youre probably good to go with the 12v transformer, normal no load output should be roughly 16vac, filtered and rectified with a full wave bridge will give you maybe 18vdc in to the chip. Best efficency for the chip is if you can get about 3v above its output rating as a linear regulator will dissipate the extra input voltage as heat. If you wish to regulate a higher voltage you can bump the outputvoltage up by about.0.6v per standard si diode added to the ground leg of the 7812. Zener diodes could be used as well if a little higher voltage is desired. Cool little circuits!


    7 years ago on Introduction

    Nice build. One note: I think the 7812 requires also a (smaller) capacitor in its output. Typically 0.1uF.