James Perrett wrote:

5534's are very common audio op-amps. You might not be able to find
the exact part number that you are looking for but a search for 5534
opamp on Farnell's website came up with a few alternatives. You might
also want to look at the dual equivalent - the 5532.

If I'm right in my thinking that I need a filter stage and a phase inverter,
the dual might be the better choice. I'll do some searching.


You should also bear in mind that many 5534's are not stable at unity
gain without additional compensation components.

I'll cross that bridge when I get nearer to it- not sure yet if unity gain
is what I'm after. I was planning to try and find the point where the signal
goes into the existing output, and building a second output from that point.
If unity gain is an issue, can I make it with suficient gain to be sure of
stability, and then attuenuate the output? It'll probably be feeding a SS
amp that wants a line level input.


--
Wally
www.artbywally.com
www.wally.myby.co.uk