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  1. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Yes, I got a “trophy” from PedalPCB when I hit 100 posts. 😂 Maybe they’ll send me a D100 diode as a prize…….
  2. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    And in case you might understandably conclude I should probably find another hobby, here’s a pic of the ‘59 “Greeny” Les Paul I built and it sounds great! Not exactly professional luthiery but I love it.
  3. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Tks, Buddy. Now that I’ve found my stupid reverse voltage mistake, I think I’ll continue. I’m retired (twice!) so I have the time. I don’t work on it constantly so it’s really been kind of fun despite all the frustrations. And of course I do REALLY appreciate all the help from EVERYONE...
  4. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Ok. 9v+ to the diode pin (diode is no longer there as I clipped it out…..), put the bridge in place of the missing diode. Now get 9v to C100 and about 5+v to C20. (Took me FOREVER to remove the - wire from the PCB. De-soldering cord worked pretty well on the + pad but neither it nor the...
  5. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Well, I check the voltage on the power cable and it reads -9v! If I connect the black cable to the center and red to the sleeve, it reads +9v. so, yes, I guess I’m feeding -9v to the +power pad. Damn.
  6. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Here’s one taken with mag light.
  7. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Here’s a better pic, I hope. And my dc jack cam from here: https://www.amazon.com/dp/B01N8VV78D?psc=1&ref=ppx_yo2ov_dt_b_product_details
  8. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    🤪. It’s the hunt that counts…….
  9. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    😆 Scratch one diode! Well, they’re pretty cheap…… Meanwhile, still checking resistor values. No wrong ones so far - about half way through…….ok, all resistors check out correctly.
  10. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    So, checked the d100 pads and they connect to + power and r101 respectively. Attached the bridge but the IC stsrted heating up right away. The cathode pin does show connectivity to C100.
  11. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Yes. No wait, R2 could be wrong. Checking the others, this will take a long time….. No, r2 is good. Damn bands are hard to read.
  12. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Should there not be continuity between the + power and r4? I don’t read any, but it seems from the schematic that it should.
  13. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    So, it’s correct that there’s no continuity between the + and - pads, right? Also, none of the vcc points, I.e. the Q’s, show connectivity to ground. Only the r4 seems to read 188 but no beep. Here’s a new pic of the solder side. Ugly, I know.
  14. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    There is no continuity between the + and - power pads. Took the jumper off as soon as the IC started heating up. The only bridge I can see on the solder side is one I put in between r6 and q1 per a previous posting.
  15. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    No continuity between ground and any of the Q’s.
  16. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    But I guess that makes sense from the schematic
  17. Jeff C

    SOLVED Cobalt Drive problems…..SOLVED……..FINALLY!

    Getting continuity between r6 and ground
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