integrators or followers

[Tony Allgood]

Mike wrote:... The problem with the op amp voltage follower method
(with a grounded cap connected to the OTA output) is that it is more
likely that the input common-mode range of the op amp will be exceeded
at some point, and latch-up will occur.

Yes, of course, and I have first hand experience of this. I need to turn
the freq pot of my filters in my poly everytime I switch on, otherwise I
get nought out of the thing. The solotuion was nearer to hand than I had
thought.

And, someone pointed out that the OTA's output only sees a fixed
voltage. This may indeed have benefits in terms of HF stability.

Regards,

Tony Allgood  Penrith, Cumbria, UK

Synth music by me at:

http://www.techrepairs.freeserve.co.uk/music.htm