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| rstofer:
Keep it simple, about+15/-15 and a separate +5 all rated about 1 amp will cover a lot of projects. Search for 7815, 7915 and 7805 circuits. Resist the temptation to overspec the PS to triple output 30A 3A. |
| pwlps:
--- Quote from: icharters on June 22, 2019, 07:37:48 pm --- I think I'm going to build a power supply to start with and see where that takes me. --- End quote --- Oh, another one, since I joined this forum I see so many beginners pushed to start with a power supply project, seems we are really short of ideas here :D For me a power supply is absolutely no fun, a top most boring stuff: can't play music nor make dance some remote stuff with it, not even a way to have some fancy display, really nothing to play to the gallery (kids/wife etc.) >:D |
| Jwillis:
Every circuit ,no matter how complex it may be, is just a lot of simple circuits put together .This includes IC 's .When you fully understand the simple circuits and how to identify them then and how they function ,the complex ones become much easier. Electronics is not an exact science.Don't try to keep tolerances to narrow to start. Your going to find every single component will have a fairly broad range of operation. It's not magic,just physics.And its not hard to understand. Most of all .Have fun with it. |
| techman-001:
--- Quote from: rstofer on June 22, 2019, 07:49:25 pm ---Keep it simple, about+15/-15 and a separate +5 all rated about 1 amp will cover a lot of projects. Search for 7815, 7915 and 7805 circuits. Resist the temptation to overspec the PS to triple output 30A 3A. --- End quote --- Yes keep it simple because that way you will finish it in a reasonable time, but make it nice, and make it to last. Design a nice enclosure for it perhaps varnished wood (three-ply ?) with a brushed aluminum front panel and labeling, use the best terminals you can buy not some el-cheapo junk. Make the mains input a combo IEG plug with fuse on the rear. You may have problems buying a transformer with the windings you need, so use more than one, learn how to hand loom the cabling inside the enclosure. Learn what the expected dissipation is and make or buy the required heatsinks. Spend some time making the 7815, 7915 and 7805 regulators easily replaceable, because you will blow one or more up at some point. Perhaps mounted on the rear of the enclosure ? Make a etched brass or aluminum nameplate for the front, " Made by ..... in 2019" that way you'll know when you made it in another 40 years. Make something you will be proud of every time you use it and in 20 years because test equipment is something you keep. My *big* bench power supply weighs about 20 kg and has 0 - 30v @ 30A, 2 x 12v @ 1A fixed and one +5v @ 3A fixed. The heavy transformer has a single 0-30 volt @ 30A secondary winding which I regulate with SCR pre-regulation and linear second stages. The transformer and all semis are force fan cooled. I made it about 40 years ago and haven't used it in a decade. Nowadays a small mains inverter makes much more sense, but of course I didn't have access to that kind of technology back then. |
| techman-001:
--- Quote from: pwlps on June 22, 2019, 08:11:28 pm --- --- Quote from: icharters on June 22, 2019, 07:37:48 pm --- I think I'm going to build a power supply to start with and see where that takes me. --- End quote --- Oh, another one, since I joined this forum I see so many beginners pushed to start with a power supply project, seems we are really short of ideas here :D For me a power supply is absolutely no fun, a top most boring stuff: can't play music nor make dance some remote stuff with it, not even a way to have some fancy display, really nothing to play to the gallery (kids/wife etc.) >:D --- End quote --- A power supply is the foundation of electronics, no power, no electronics, so it makes sense to start at the beginning and work ones way up from there. Assembling kits that look flash and impress people who don't know anything about electronics either, whilst good for stroking ones ego's isn't electronics, but it's probably art. You may be looking for artblog.com ? |
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