Is this SMPS schematic plausible?

[The Lord Flashheart]

Hi all,

I am trying to build a car audio line driver and need a bipolar power supply for the Op Amps.

I had a Boss AVA1210 Equaliser, which is terrible, but seems to have a tidy and compact dual rail power supply.

I have traced the circuit out and have come up with the schematic below, the idea being that if the circuit is plausible I will integrate it into the line driver PCB.

Does the circuit look ok, I will be reusing the original parts from the current PCB if possible.

I had wondered about increasing the size of the capacitors to bring down the ripple a bit but wondered whether the oscillation of the circuit depends on their values?

 

[JonSnell Electronic]

Hmm.

D3/4 and D5/6 are back to back and will short each other out.
No feedback loop for stabilisation.
There is no isolation between power in and power out.

 

[The Lord Flashheart]

Thanks Jon.

Silly mistake on the diodes, thanks.

I shall look for anything that would constitute a feedback loop on the original PCB again.

Is isolation important for low voltage SMPS?

 

[Ketje]

I think the circuit around D7 is inverted.
Mona