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  1. M

    SOLVED cetus preamp - no signal when engaged

    so build #2 works as expected. noisy, but that might have a lot to do with it being not in a case. build #1 works... kinda. but there's a really obnoxious noise coming through. suppose I'll try the audio probe on that one again tomorrow. i'm willing to accept that after the constant reworking i...
  2. M

    SOLVED cetus preamp - no signal when engaged

    you know, all of this looked fishy so i tried a different power supply .....MAN do i feel like a jackass. totally works. literally the first step in troubleshooting... start at the end and the beginning. is it plugged in? is a fuse blown? are YOU plugged in?
  3. M

    SOLVED cetus preamp - no signal when engaged

    IC2 -.08 to -.1 at pin 4 -.15 at pin 6 -.17 at pin 7 -.36 at pin 8 IC1 -.08 to -.1 at pin 4 -.36 at pin 8 IC100 -.36 at pin 1 -.3 at pin 2 -.08 at pin 4 -.1 at pin 5 -.21 at pin 6 -.02 at pin 7 -.1 at pin 8 R100 -.36
  4. M

    SOLVED cetus preamp - no signal when engaged

    got the materials and made the audio probe. fantastic piece of kit. signal at input, signal through C1, R1, and nothing on any pin of the first op amp. i mentioned that i bought enough parts to build 2 of these. so i built the second one, taking a lot of advice here and assembled it with...
  5. M

    SOLVED cetus preamp - no signal when engaged

    All I’ve got is a multimeter. And I wouldn’t begin to know where to start with that.
  6. M

    SOLVED cetus preamp - no signal when engaged

    I see what you’re seeing, it turns out that was a tiny bit of cotton from a qtip where I was cleaning up some flux 😅 And no, still not working. I started the other board last night. Everything is super tidy this time. But I’m afraid that when I try to fire it up I’m going to have the same issue...
  7. M

    SOLVED cetus preamp - no signal when engaged

    i didn't at first, but i do now (and will do so moving forward)
  8. M

    SOLVED cetus preamp - no signal when engaged

    Much appreciated. Is this correct? Because it still doesn’t work 😬. But I’m learning a lot here.
  9. M

    SOLVED cetus preamp - no signal when engaged

    Can you elaborate? I couldn’t find any instructions on these jacks, and went with the “long side is positive, short is negative” approach.
  10. M

    SOLVED cetus preamp - no signal when engaged

    all very reasonable and helpful advice. respectfully, it didn't work before i reflowed the board a half a dozen times and my helping hands scratched the board. they've been taped up since. if bunk op-amps weren't the issue, i'm hoping someone can spot what is. i bought enough parts to build 2...
  11. M

    SOLVED cetus preamp - no signal when engaged

    Fresh op amps from a different supplier. Socketed this time in case they were bad. Lesson learned there. Replaced a resistor I’d broken. Reflowed every connection. Annnnnd it still doesn’t work.
  12. M

    SOLVED cetus preamp - no signal when engaged

    you were right on all accounts. those were definitely in the wrong places. i knew my eyes were getting bad but i didn't realize i'd forgotten how to read 😅. and as predicted, that didn't fix the bigger issue at hand. though i very much appreciate you spotting that. i imagine it would have...
  13. M

    SOLVED cetus preamp - no signal when engaged

    Hey all, first post, first build. i've done some much simpler circuits and mods, but this is the first big one. i have good bypass, but as soon as i turn on the pedal, it mutes. LED comes on. volume is up. cables are good. i have reflowed every connection, checked the orientation of every...
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