Electronics > Beginners
DIY power supply
MarkF:
I just finished laying out a triple fixed output power supply using MC78xx and MC79xx. I have in mind a +5V and +/-15V fixed outputs using two transformers. That way the +5V will be independent of the +/-15V outputs. Each output would be capable of 1A.
You could build it up to replace your AT Power Supply that died. You would have to get the PCB made.
Pirateguy:
--- Quote from: MarkF on August 29, 2018, 08:23:44 pm ---I just finished laying out a triple fixed output power supply using MC78xx and MC79xx. I have in mind a +5V and +/-15V fixed outputs using two transformers. That way the +5V will be independent of the +/-15V outputs. Each output would be capable of 1A.
You could build it up to replace your AT Power Supply that died. You would have to get the PCB made.
--- End quote ---
looks simple enough, could you post the schematic?
i might try to build this on some perfboard.
MarkF:
You can buy dual +/- linear supplies from eBay. But, the heat sinks are so small that you could not pull much current from them.
Example
I just threw the PCB together from the datasheet examples. But here's a quick circuit:
Edit:
The LEDs are there to provide the minimum 5mA load current for the regulators.
You can set them for whatever current and brightness you want (5mA <= ILED <= 20mA).
xavier60:
I knocked up a simple low power multiple rail power supply using 3 pin regulators.
I also added a variable dual tracking regulator.
It has about 1% drift over its operating temperature range because the control transistors get heated unevenly by the series pass MOSFETs. The load transient response is fast at 20us.
Pirateguy:
i got lucky and had some extra spending cash, so i went ahead and ordered that module.
for the fixed output one i don't have a split source i think, so ill make the 5v one in your circuit
and another one like that at 12v.
for the heatsink i think i will use the big one i took out of the AT and run a fan on it the same way.
can i use 4007 diodes and 4700uf caps instead?
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