"George Herold" "Phil Allison"
Phil, Opps, Sorry, I really set you off. Pleae accept my humble appologies. I did not look at your schematic! My only excuse can be resonding to email late at night after after tipping a few with friends during the Buffalo Bills game. (The Bills won!!!)
** Glad to hear it ......I am at work now and will happily look over the circuit. You mentioned a double All Pass phase shifter, which I see as the first two op-amps, but how is the loop amplitude controlled? What stops the oscillations from growing with out bound? OK I think I see when the four diodes start to conduct the gain around IC2a is reduced.
** Yep - it only take the slightest bit of diode conduction to do that too.Such limiting is nothing like as complicated as using a feedback control loop.
Cos, unlike such loops, is both instantaneous and 100 % effective.
IC2b performs the magic of removing the distortion.
If I leave out the thermistor then a signle RV2 pot will adjust the amplitude. I'll try bread-boarding the circuit and see what I think.
** Be amazed.For more output level, best use more diodes or ( matched) low voltage zeners back to back.
.... So I started looking at building my own oscillator and when I found the Weinbirdge I "fell in love". (Does this make me a farie??) So the romance is now winding down and I'll again certainly look at your oscillator. And agian sorry for getting you upset.
** I think I can live with it...... Phil