Electro-Harmonix

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December 23, 2021 at 4:17 pm in reply to: Vintage (1978) Deluxe Electric Mistress – Rate isn’t working #186760

eman1996
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Another observation on the broken Deluxe Elec. Mistress. When I put a sine wave in, I see it on the first pin of the input decoupling cap (27nf cap in the schematic link below). On the other side of the input decoupling cap, I see the sine wave with a 15 volt DC offset. Is this normal? Or is this a clue to a problem? Any suggestions?
Also, I replaced the LM324 and the two 33uF caps associated with the Rate, but I still don’t see the rate moving on Pin 8 of the LM324.
http://www.metzgerralf.de/elekt/stomp/mistress/images/deluxe-electric-mistress-v2-schematic.gif

December 1, 2021 at 10:14 am in reply to: Vintage (1978) Deluxe Electric Mistress – Rate isn’t working #186381

eman1996
Participant

I should have mentioned. I verified all the connectivity in the RATE portion of the circuit. There were some issues (broken traces) with one of the pots and I added a jumper wire to connect that leg to the proper component. I saw some listings of people checking voltages on all of the ICs. Is there a reference voltage list? I’m wondering if the LM324 is bad.
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