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| DIY power supply |
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| 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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