On 17 Nov 2004 11:37:27 -0800, (Jim Meyer)
wrote:

"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.


OK, now crank in some dc offset voltages on the opamps. There are four
cases.

John