aos
May one day solve the Mystery of the Whoosh
- Joined
- Jun 21, 2001
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I plan to design and make some PCBs for power supplies for my many projects. I have too much projects half-done (some of it quite expensive and hard to get) because I don't have required power supply. Some need unregulated +-9V, and some need regulated +-5V, or +-12V or +-15V or even +-24V, or a combination of all those. And some need little current while others want lots of current.
I personally find them a huge hassle, so I'll just make a modular design, with unregulated but well filtered board being separate from regulation module. That way one can easily swap the regulation for whatever project calls for (super regulator, simple 3-pin regulator, or no regulator at all if one is already on the main board etc.). Also unregulated board would have line filter (common mode choke plus capacitors), could fit several different sizes of Talema transformers, would have two fuses, and after transformer it would have common mode choke with big bank of capacitors on each side, could fit DO-41 or TO-220 rectifier / ultrafast diodes bypassed with caps. One can of course put as many or as little parts on the board as necessary.
As for other PCB, a (Jung variant) super regulator as discussed last year on Headwize, with LM6171 broadband amp and two or three very high frequency transistors would be cool for 100-200mA to supply opamps, and maybe another simpler one using a buffer like in Kevin Gilmore's power supply, for output stages, to supply 1A or so. Probably using some of the LT's high performance voltage references just for fun.
The idea is to have everything or as much as possible available from Digikey so that you have no need to redesign the board every time you need to build a PS. Unfortunately Digikey is very expensive when it comes to Talemas (didn't they jack up the price by 30% or so?), line filters and heck even Panasonic caps are way overpriced, not to mention fuse holders etc.
I was just wondering if there is a general interest for such a thing. I'll probably be making them for myself anyway as I really need something like that. It's easy then to order a batch of boards... I just ordered a few boards for portable DAC and it was much less hassle than I thought it'd be and isn't expensive either.
I personally find them a huge hassle, so I'll just make a modular design, with unregulated but well filtered board being separate from regulation module. That way one can easily swap the regulation for whatever project calls for (super regulator, simple 3-pin regulator, or no regulator at all if one is already on the main board etc.). Also unregulated board would have line filter (common mode choke plus capacitors), could fit several different sizes of Talema transformers, would have two fuses, and after transformer it would have common mode choke with big bank of capacitors on each side, could fit DO-41 or TO-220 rectifier / ultrafast diodes bypassed with caps. One can of course put as many or as little parts on the board as necessary.
As for other PCB, a (Jung variant) super regulator as discussed last year on Headwize, with LM6171 broadband amp and two or three very high frequency transistors would be cool for 100-200mA to supply opamps, and maybe another simpler one using a buffer like in Kevin Gilmore's power supply, for output stages, to supply 1A or so. Probably using some of the LT's high performance voltage references just for fun.
The idea is to have everything or as much as possible available from Digikey so that you have no need to redesign the board every time you need to build a PS. Unfortunately Digikey is very expensive when it comes to Talemas (didn't they jack up the price by 30% or so?), line filters and heck even Panasonic caps are way overpriced, not to mention fuse holders etc.
I was just wondering if there is a general interest for such a thing. I'll probably be making them for myself anyway as I really need something like that. It's easy then to order a batch of boards... I just ordered a few boards for portable DAC and it was much less hassle than I thought it'd be and isn't expensive either.