B.E.A.N.S.L.O.P. Power Supply

150

02:11:09

The +/-12V Power Supply for the Modular Synthesizer. The Two Resistors on the Right are Load Resistors.

Question: Is the voltage ripple in the +12 rail double the ripple voltage in the -12 volts rail from the circuit or engine limitations?

Due to Engine Limitations the Circuit Will Not Start if Either Switch is Closed. They Must be Closed in Order For the Circuit to Function. (Thanks to 592azy2circuitdude for discovering this workaround.) 

published 2 years ago

592azy2circuitdude

2 years ago

Hi, and welcome to EveryCircuit. I don't know why it's not simulating either! But I did find a workaround. https://everycircuit.com/circuit/4543735249240064 I modified your circuit to include a switch. Good luck.

roops1967

2 years ago

The only way I could get it started is add a 1k resistor between the opamp and transistor base, and reduce the emitter resistor to 1Ω, aaand reduce the opamp gain to 1k

592azy2circuitdude

2 years ago

I suggest you check the circuit layout VERY carefully. I think the switches are not in the right place.

592azy2circuitdude

2 years ago

I updated my circuit that's based on yours. I don't know if it's what you're looking for, but maybe it can help... https://everycircuit.com/circuit/4543735249240064

roops1967

2 years ago

Ain't that interesting, I swear I didn't see your comment circuitdude when I posted mine, but there you are before me 🤔 that's a head scratcher and so was this original circuit

592azy2circuitdude

2 years ago

I guess I just barely beat you to a workaround solution 😄. I've also used the technique of reducing the open loop gain of the opamp. EC seems to have trouble whenever a non-linear device (like a diode or transistor) is placed in the feedback loop of an opamp. I seem to remember reading that somewhere on EC a long while ago...

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