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I r oDon't be silly. I've built a couple of Baxandall class-D oscillators and made them work - there's even one in my Ph.D. thesis. The variation that I'm failing to turn into working hardware at the moment is one that I first put together in 1986 at Cambridge Instruments for the Metals Research (then a wholly owned subsidiary of Cambridge Instruments) GaAs crystal puller. That machine used an LVDT-based weighing head to keep track of the increasing weight of the GaAs single crystal, and the circuit originally designed - some ten years earlier - to excite the LVDT and demodulate its output had depended on a couple of components that had gone obsolete by 1986.
I put together a new circuit - including my low distortion variant of the Baxandall Class-D oscillator - which worked quite a bit better than the original and still fitted into the same - very restricted space. It went into every subsequent crystal puller that Metals Research produced and was field retro-fitted to a number of machines.
To be honest, it's main virtue was that the output op-amp wasn't the
741 designed into the original, but - IIRR - the rather quieter OP-07, which didn't suffer from pop-corn noise, so that the 30kW induction heater in the puller stopped switching from full on to full off every minute or so, but stayed running at about half power once the Ga/As charge had heated up to 1238 =B0C.The operators really liked that - it not only meant that the machine didn't wake them up all the time but also (in theory) decreased the thermal strain in the GaAs single crystal.
It never looks like fiddling after you've got the circuit working. Circuit analysis after you've got it working is almost always easy.
-- Bill Sloman, Nijmegen