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  1. SparkyCal

    A Stretch

    ok...so i have replaced the op amp with the 4558D. I now have: Pin 1 as out Pin 2 as - In Pin 3 as + in Pin 4 as Ground Pin 8 as Vcc in I am using this datasheet: https://components101.com/ics/lm4558-dual-op-amp-pinout-datasheet Bertus- i read the article you asked me to, but it is too...
  2. SparkyCal

    A Stretch

    Yes. I can replace the chip. I have tons of the 4558 s. Someone said that’s a dual op amp and the second unused amp should be shorted to prevent noise. But how do you short it?
  3. SparkyCal

    A Stretch

    Voltage from R32 to ground. 4.47 Left leg of R33 to ground. 4.4 Right leg of R33 to ground. 8.9 Pin 6 to ground. 7.8 Pin 3 to ground 7.77 I alos notice that when i measure stuff and the pins move slightly, the readings quiver and go to zero. As I have a variable power supply, is it worth...
  4. SparkyCal

    A Stretch

    What I don’t understand is if the voltage between pin 6 and ground is too high, does that not signify part of the problem? Doesn’t that mean the power aspect of the circuit is wrong? Also , maybe I have a bad part and it is driving us crazy. Part of me says to start over on a Pcb and eliminate...
  5. SparkyCal

    A Stretch

    Sorry about the permission thing. Did not know it was going to do that. The sound simply does not have distortion.
  6. SparkyCal

    A Stretch

    Thank you. I may have incorrectly interchanged terms calling volume gain and vice versa. I am using the right pots with the right values in the right places. the signal in comes from a Fender telecaster, so the signal in is good. I will re-examine the whole circuit again and report back.
  7. SparkyCal

    A Stretch

    Here is what it sounds like. Has no distortion. The 500K volume knob is working properly, in that it increases the volume- but there is no distortion. have a listen: https://drive.google.com/file/d/1lqH1MgfUsGCSGDOTketayJwSZzpCCBMs/view?usp=sharing
  8. SparkyCal

    A Stretch

    Thanks guys. I don't know what to suggest any more. I rebuilt the power section with new resistors and capacitors and I am still getting a reading of 7.784v. when I put the positive multimeter probe on pin 6, and the negative multimeter probe on ground. Part of my frustration is that i am not...
  9. SparkyCal

    A Stretch

    Would it make sense for me to rebuild the power part of this circuit from scratch? Then we can ensure it is built properly and that it is sending the right voltage.
  10. SparkyCal

    The Adventure Continues......

    I don’t get it. The son of screamer circuit has two op amps.
  11. SparkyCal

    A Stretch

    I am on my way to an appt, but I will check back and try whatever advice is given, when I return in about an hour ro two. Thanks for hanging in., We're close.
  12. SparkyCal

    A Stretch

    I know this pic is not the best, but here is a pic of the area of the breadboard that Audioguru is asking about. You will notice that C30 is between the + and - rails on breadboard R32 (10K) (left leg in on - rail), right leg is on breadboard pin (Row 9, second hole from + rail-hole 2 On...
  13. SparkyCal

    A Stretch

    When I turn the gain, it doesn't seem to do much. I have the left prong of the gain connected to Pin 2, and the right side of the gain (that is also shorted to the middle prong) connected to Pin 6
  14. SparkyCal

    A Stretch

    Sorry. Let me clarify. I am using a power supply set at 9v. I held the positive probe of my multimeter at pin 6, and my negative problem to the negative line out of the power supply. I register 7.8 v. Still no distortion though.
  15. SparkyCal

    A Stretch

    We are making progress. I stupidly forgot to turn on the power supply last time, and that is why all the buzz was there. With the power supply in, there is no buzz and I am getting a nice clean sound out to the Fender amplifier. However, there is no distortion. I put the multimeter probes on...
  16. SparkyCal

    A Stretch

    To answer some quick questions. Yes, the out is being plugged into a Fender Hotrod Deluxe amplifier. I am not sure that all those grounds are connected together but wherever it says Ground, I run a wire from that connection to the negative rail.
  17. SparkyCal

    A Stretch

    Bertus and Audioguru. Your comments are giving me hope. I was getting disheartened building the circuit over and over with the same result. Your observations are the type of testing and analysis that is required to solve this. I will report back once I have a chance. Deal with a problem with...
  18. SparkyCal

    A Stretch

    There has to be something wrong with this circuit. I built it again- exactly according to Bertus' schematic and it still did not work. No sound at all coming out and rather, buzz. I am miffed by this. I wonder if i have the right capacitors. I went out and bought the film capacitors but, for...
  19. SparkyCal

    A Stretch

    Well, here goes nothing. I am starting over on this circuit and I am using the schematic that Bertus posted here:https://www.electronicspoint.com/forums/threads/a-stretch.293212/page-5#post-1800819
  20. SparkyCal

    The Adventure Continues......

    Martin: Upon reconsideration, i agree with you. IU am goign back to the thread entitled A Stretch and try ti again. I am putting this thread on hold.
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