Quote:
Originally Posted by TonyDuell
Why is there no feedback on U1 (or U3, but the latter could be intended to saturate)?
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Thanks for your thoughts. Unless I'm mistaken U1's feedback is via the tone control network, and U3 is just a voltage comparator - it conducts pulses to Q5 depending upon the setting of VR5. (Although it's quite possible I have miss copied from my old hand drawings.)
I shamelessly lifted those two circuits from '50 circuits using IC 3130'. Just found an online copy here:
https://www.americanradiohistory.com...-ic-ca3130.pdf
Ian