| Electronics > Projects, Designs, and Technical Stuff |
| Small and quite +/-8v power supply/regulator |
| (1/4) > >> |
| CuriousAbe:
So I've come pretty far in my summer project to clone a certain old analogue drum machine and now it's time for the power supply. The original unit is powered by a good ol transformer, 2x 2200uf caps, 2x 10uf caps, a full bridge rectifier and a 7808 and 7908 voltage regulators, needless to say it's pretty noisy. For various reasons I have decided not to supply the kit it with a linear psu and a transformer involving mains wiring. So I'm looking for a reasonably small and quite +/- 8v supply/regulator design, requirements: *Must fit on a board that is max 145x45mm (50mm height) *+/- 8v output *Around 200-300ma output *No mains wiring, preferably input should be with a ac/dc power adapter (ac/ac works too) *Switching design is fine by me as long as it's reasonably quite *Preferably all through hole components |
| ogden:
Why don't you like original power solution of linear supplies? Don't spoil your *analog* build with switching supply :) You can't avoid mains because wall plugs or brick supplies, usually are single output. You could use power module, but it requires AC wiring & AC fuse holder: AC->DC two output +/-12VDC *module* like Raccom RAC06-12DC. Obviously with two linear regulators behind it. Don't use prehistoric 7808 and 7908. Use LT3045 and LT3094 instead. Pricey but low noise as you wished, will not regret that choice. |
| iMo:
LM317/337 are cheap and quiet too (with a capacitor in the divider). |
| CuriousAbe:
--- Quote from: ogden on July 24, 2019, 10:02:10 pm ---Why don't you like original power solution of linear supplies? Don't spoil your *analog* build with switching supply :) You can't avoid mains because wall plugs or brick supplies, usually are single output. You could use power module, but it requires AC wiring & AC fuse holder: AC->DC two output +/-12VDC *module* like Raccom RAC06-12DC. Obviously with two linear regulators behind it. Don't use prehistoric 7808 and 7908. Use LT3045 and LT3094 instead. Pricey but low noise as you wished, will not regret that choice. --- End quote --- Well I will be selling the clone as a kit (pcb's+case) and I don't want people who are not comfortable handling mains wiring doing so, and I know people who are not comfortable with mains will be buying this kit. Yea I was thinking on the small module route, however there seems to be a gazillion different small ac/dc modules to chose from :P Will keep the LT3045 and LT3094 in mind! Another idea is to make something like this, maybe I could redesign it to use the LT3045 and LT3094 regulators instead. http://musicfromouterspace.com/analogsynth_new/WALLWARTSUPPLY/WALLWARTSUPPLY.php Input is a 12VAC power adapter (problem here is that these are not that usual to come by for cheap in europe). |
| ogden:
--- Quote from: CuriousAbe on July 24, 2019, 10:28:41 pm ---Will keep the LT3045 and LT3094 in mind! --- End quote --- Definitely overkill for DIY kits. Better use mentioned LM317/337. --- Quote ---Input is a 12VAC power adapter (problem here is that these are not that usual to come by for cheap in europe). --- End quote --- Why your specified current is so high, 200mA? Anyways for 12VDC power adapter (wall-wart) there's solution for negative rail: isolated DC-DC 12V->12V converter like Murata NXE2S1212MC-R13 Through hole: SPU01M-12 from MeanWell, but it's 80mA only, very noisy on both sides, input & output. Make sure to use LDO's with good PSRR. |
| Navigation |
| Message Index |
| Next page |