"Jim Meyer" wrote in message
om...
"Watson A.Name - \"Watt Sun, the Dark Remover\""
wrote in message
...
Opinions on this, especially the 2.5W amp schem at the bottom.
http://www.intio.or.jp/jf10zl/EF.htm

When the amp is idle, and there's no(?) current flowing in either
output
transistor because there's no forward bias, then the V drop
'resistance'
of the E-B junction adds to the 100k feedback resistor, so the loop
gain
increases to the open loop gain. So it would seem that the amp
would
attempt to hunt in this region, possibly oscillating?


I just simulated the circuit in LTSpice using LT1113's instead of
the TL084. It simulates quite nicely. The feedback causes the base
drives to swing through the "crossover" region so that's no problem.

Here's a "cut-n-paste" ASCII file for the input to LTSpice:

Thanks for the sim. [snip]

Swing thru rather quickly I would guess. And doing so with the
possibility of overcorrecting? Or hunting about trying to find a place
it can never find? Or having two opamps, the phase shift might be too
great at high freqs. Or..