LM3886 Single Supply Rail Transformer Setup

[Bazukaz]

Why don't you just unwind some windings to get lower voltage ?

[john65b]

Looking for +/- 27 - 30VDC for 4 ohm speakers. 150VA/amp module and 4 total modules - paralleled for 2 channel operation.

Transformer is 600VA, 40VAC -0, 40VAC -0 secondaries, getting 55VDC - 0, 55VDC - 0 after rectifier/12000uF caps.

Trying to see if I could "post rectified split" each +/- 55VDC - 0 rail to get two +/-27VDC - 0 ...

So in summary, four rails of +/-27VDC - 0 @ 150VA off this transformer via "split"...possible?

[Bazukaz]

There is high probability that this circuit will not work well , but you can try "Simulating" ground.
Resistors should be 500 ohm or so , 2W.

This works for op amps , but currents are much lower there.

[lineup]

I attach
the single supply LM3886 circuit, from datasheet.
The supply is pin1 and pin4.
+V and Ground.

You need input( 2.2 - 10 uF ) and output ( 4700uF ) caps.
A divider 91kOhm - 100kOhm to bias input.
Also a transistor feeding 'GND' pin #7.

Several of components are optional.
See datasheet comments for more info.