Originally posted by nickb
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R25 seems to be equivalent to ESP's R2, and R26 with ESP's R7.
His suggestion that the resistor in parallel with the drive coil be roughly 10x the 1khz impedance seems pretty reasoanble to me since it also sets the output impedance of the opamp.
It's interesting that he suggests higher values for the R2/R25 position given that the power supply situation is similar, but he's using a buffered opamp in his example schematics. He suggests 33 ohms for a 8 ohm tank and a 5532 with transistors added to the feedback loop.
Am i missing something about how that is selected, or did they just pick the "as much as possible without going up in smoke" value for the tl072?
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