wrote in message
ps.com...
Well, the good news is the sooner you get onto another piece of kit the
sooner you're going to have a result.
Plus you can use your TIPs to make a nice big power amp.
Coincidentally, you've even got the psu, case & preamp all already
there.

The pre-amp/amp are *heavily* integrated, same PSU. I'd have to look pretty
hard to find a point to break into the circuit at pre-out. I think I'll
just build myself a 20-150Hz variable low-pass filter and 50W push/pull amp
for the subwoofer with the TIPs. I can cut the board off (the PSU is well
isolated off by itself) and use the relatively large empty space for my new
amp. Conveniently, the 4-channel audio processor chip which provides input
switching btween three sets of input jacks (even a high-gain set!) are all
on the PSU end of the board.

I'm disappointed I can't get it working fully as it *potentially* does
exactly what I want.

Oh well, success is knowing when to cut your losses.

Dave

Mark Z wrote:

The problem is that the base-emitter junction of each output transistor is
effectively a diode to the diving circuit, clamping at around .6 volt,
unless the outputs are Darlintons, of course...

I reckon this one has horrors instead of darlings for the output


NT