Unity gain NFB speaker-buffer

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I want to try with a special buffer between my poweramp and the speaker, to isolate the feedback loop from the speaker load.

I have a trafo 18-0-18V/800VA and 2x47.000uF, + heavy heatsinking...

Now I need a circuit to use...do some of you have some experiences?

:)
 
I assume that you are wishing to use a non-global feedback power follower and some favourite main amp then? Or the exercise is pointless as the follower will be affected by the back EMF etc even worse (due to massive feedback) so the problem remains. In fact, instead of such a power follower, why don't you just make the main amp non-global feedback? This would be cheaper, easier, smaller, use less parts, less heat...
 
djk said:
That's a bit complex to be simply called a 'diamond buffer', OTOH, the 'hot follower ' linked to above is a 'diamond buffer'.


Though I admit it is too complex for a normal DB, but if the supply
voltage is not too high say 18-0-18, it can be much easier to take
off the STAND-BY & Voltage Reference circuit and about 8 trannies.
Because the 2SK246BL can sustain only 50V.

Q8 through Q11 are for JFET source follower and bias provider,
no gain, but the DC output level can be adjusted by tunning the SVR1.
The circuit's thermal control is very easy.
 
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