Tweakers' Asylum

RE: Opamp implemented for power supply circuit.

24.19.147.14

Duster

In Reply to: RE: Opamp implemented for power supply circuit. posted by Ugly on April 26, 2018 at 17:00:47

Hi Ugly,

I don't have the actual schematics for the particular PSU, but here is a link to a German language version of the design it is based on, with some schematics. TIA

See link:

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&c (Open in New Window)

Follow Ups:

RE: Opamp implemented for power supply circuit. - Ugly 06:15:02 04/27/18 (0)
Linear regulator manufacturers often plot expected ripple rejection with respect to frequency, often up to 100kHz or more, for these "DC" circuits.

Linear regulator manufacturers often speak of the spectral content of noise on the output. One can deduce that noise currents typical to bipolar input op amps will develop noise voltages across the 10k resistors on the inputs of this op amp which start to exceed quoted output noise ratings for common voltage regulators. High quality fet input op amps can be quite a bit better in this regard.
RE: Opamp implemented for power supply circuit. - Ugly 20:33:55 04/26/18 (0)
I can't say for sure whether op amp rolling gets you anywhere audibly and I did not try simulating the circuit. After skimming the circuit I'm skeptical about using anything other than FET input op amps. I think a bipolar op amp like the Bursons will introduce too much error from input bias/offset currents. If you decide to go for it please report your result.
I might try simulating it later though. It looks pretty interesting.

Edits: 04/26/18

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