Guest liquibyte Posted December 18, 2014 Report Share Posted December 18, 2014 A couple of months ago I bought one of these transformers in the hopes that I'd be able to use it in a ±15V dual supply for playing around with dual supply op amp circuits. I came across a design on seekic that seemed to fit the bill but I had to do some tweaking to get it working the way I wanted. The schematic and associated simulation is what I ended up with and I'm posting it here in the hopes someone might get some use out of it. It seems to work in simulation rather well but I have to pick up some 5.1V zeners to breadboard it up to see how it performs in the real world. I haven't tried to get it down to 0V and probably won't bother as it's not really needed but I might play around with current limiting later on. Basically we have a 1-15V positive and negative tracking supply that can deliver up to 1A per side.0-15-tracking.zip Quote Link to comment Share on other sites More sharing options...
Hero999 Posted December 18, 2014 Report Share Posted December 18, 2014 I've does this before but I used voltage regulator ICs which have built-in over current protection.A transformer needs to be de-rated when used to power a rectifier and filter capacitor so a 1A transformer may overheat if 1A is drawn from the DC side continuously. Quote Link to comment Share on other sites More sharing options...
Guest liquibyte Posted December 20, 2014 Report Share Posted December 20, 2014 How's this look? I can't quite get the limiting fully linear but it seems to work for the middle range of the pot well enough. I chose the 0.05 ohm sense resistor because I have a meter on the way that has that for its sense value, otherwise I'd have probably gone with 0.1 ohms. I also kept the pots at values I have on hand at the moment. It's hard designing around parts you have instead of what you should be using.0-15-tracking-w-current-limiting.zip Quote Link to comment Share on other sites More sharing options...
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