Can someone describe to me what's going on in the input section of this amplifier? It looks like a second differential amp in series with the first, but it's drawn a bit convoluted so it's hard to tell. Or is it just a pair of symmetrical diff amps drawn oddly?
I've never seen anything like this.
http://www.audio-circuit.dk/Schematics/Phase-Linear-700B-pwr-sch.pdf
I'm just curious, trying to learn. Thanks.
..Todd
I've never seen anything like this.
http://www.audio-circuit.dk/Schematics/Phase-Linear-700B-pwr-sch.pdf
I'm just curious, trying to learn. Thanks.
..Todd
It's just two diff stages - one feeding the other. The only weirdness is that Q3's collector goes to ground instead of the - rail. That's a lot of VCE difference. I would have dropped it to the rail.
Two diff stages in front of the VAS adds that much more NFB. And these things were on the hairy edge of stability.
Two diff stages in front of the VAS adds that much more NFB. And these things were on the hairy edge of stability.
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