Quote:
| Does anyone have a schematic for a good 24V power supply? |
The schematic of my
TEPS is a pretty standard design. It's a lot like the Welborne PS1, without a lot of the audiophile excess.
There's a range of DIYing open to you with this design:
- You can just take the schematic and make the regulator on a chunk of protoboard and hook it up to an off-board transformer. You can get all the parts you need at Radio Shack with the exception of the AC filter parts, which you really don't need if you use a non-toroidal transformer.
- You could etch your own boards and get the parts at DigiKey. You'd have to trim the part list carefully to meet your $50 target. See the FAQ in the TEPS docs for my list of ways to save money on the project.
- If you want a PCB but don't want to etch it yourself, keep an eye on the Mall-Fi forum. That's all I'll say in this forum.
Quote:
| Building it myself should save a few bucks. |
If you were looking for a commercial supply with performance equivalent to what you can build along the lines of the Welborne PS1 or the TEPS, you are right; a packaged commercial version of these supplies would be quite expensive. But, if the main goal is to save money, off the shelf wall warts and open-frame linear supplies will be cheaper. You just can't beat volume purchasing and cheap labor, and those things gravitate toward lower-end designs. See the benchmarks in the TEPS docs, and compare the $30 Elpac WM080 to the TEPS which costs around $75 in parts without counting the PCB. Made to my spec, the TEPS would probably be $250 commercially. Compare the Creek OBH-2, which is a similar power supply design to the TEPS, but cheaper all around, resulting in somewhat lower performance levels; it's $150.
