AC to 24v DC w. Error Correction

Very Cool !

What he said!

Thank you very much. I appreciate your compliments.

Cool circuit ! I was triying to do something similar ^^

I like the idea. However... #1 The 4.7mF cap (left) is mis-connected. #2 The xfrmr (left) should really be a center tapped secondary, with the center tap to ground, since the rest of the circuitry is referenced to ground as a center/balance point. #3 The DC supply (left) is only a "reference voltage" to regulate the power, which is actually supplied by the (invisible) +/- 24 volt op-amp power supply. Where the current for the op-amp outputs is sourced from. Do I have that correct?

Respectfully offered. :o)

Is it possible to add a center tapped transformer in this app without making one? You are correct. I would power the op amp off of the +/- 24v rails coming from the transformer/rectifier. The op amps are only there to correct that output.

I believe you would need to make the needed center tapped transformer using two stock units. With the primarys in parallel & the secondary windings in series. Watch your phasing. ;-)

As far as powering the op-amps using your existing (visible) 24 volt supply... I don't think that would work. As it is presently the op-amps are already powered by another +/- 24volt supply that is not a visible part of your drawing. That supply is not shown, but exists (invisibly) only to power the op-amps. So the 24 volt supply that you drew, should only serve as a reference voltage and not as a current supply. This is a good thing, because if it were supplying current for any other purpose, that loading would cause a shift in voltage and then you would loose the accuracy of your reference. Actually... a reference voltage should really be a presision regulated supply. The 24 volt reference you have would be sensitive to line flucuations.

Bearing in mind that unless those are power opamp's you are going to struggle to pull 27ma from there output without them getting a tad warm. As far as centre taps put 2 transformer secondaries in series as unclerick said.

That fact would be correct, pip, however the op-amps in E.C. are quite robust. They don't seem to have any limitation. I have played with them as I'm sure you have as well. I have seen these theoretical op-amps send many, many amperes. Way more than is realistic. I wouldn't mind seeing another parameter for these op-amps, that would give them a realistic wattage sink limitation, or not, as an author desires. Cheers.