| Electronics > Beginners |
| Rail splitter circuit (looking for approval :D) |
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| Marulo:
Hey! So, I've been trying to make a symmetrical supply from an unsymmetrical for quite some time now, and I think (or at least hope) that I got it! Problem is, I don't currently have any MOSFETs and ordering them will take some time so I thought, "Why not just ask?". So I attached the schematic, so please check it out. My train of thought went like this (hopefully you can correct me if I went wrong somewhere): I can make a normal resistor voltage divider using and buffer it with an op amp, but the problem is, the op amp can't source/sink enough current for, for instance, a modular synthesizer. So, can I buffer the buffer op amp? I looked online and found a circuit similar to this, briefly simulated it and all seemed good :-+. Thanks for the help guys! |
| MrAl:
Hi, I dont think that is a good idea because both mosfets will be turned on and thus conducting a lot of current. |
| MarkF:
You should read this thread https://www.eevblog.com/forum/beginners/virtual-ground-push-pull/msg2343744/#top |
| Marulo:
Thanks! I'm guessing I'm mostly interested in this part of the circuit (see attachment). I know I may sound kinda dumb, but could you explain why using BJTs is better in this situation? Thanks man! Really helped! ;D ;D ;D |
| Zero999:
--- Quote from: MrAl on May 04, 2019, 05:35:30 pm ---Hi, I dont think that is a good idea because both mosfets will be turned on and thus conducting a lot of current. --- End quote --- Actually no, the MOSFETs are configured in class B, not class A. The problem will be poor transient response, as the op-amp's output will have to change very quickly, when the direction of the output current changes. --- Quote from: Marulo on May 04, 2019, 06:02:47 pm ---Thanks! I'm guessing I'm mostly interested in this part of the circuit (see attachment). I know I may sound kinda dumb, but could you explain why using BJTs is better in this situation? Thanks man! Really helped! ;D ;D ;D --- End quote --- Better but it's prone to oscillation. Look at the end of the thread linked to by MarkF, for some circuits which have fixed the problem. https://www.eevblog.com/forum/beginners/virtual-ground-push-pull/msg2374209/#msg2374209 |
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