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  1. SparkyCal

    Distortion Pedal Redux

    btw- I am thinking of using the 4558D for this because we have successfullybused it before, so I kn ow it works. But I need a reminder der. I know that to silence the second op amp, you connect the second Out to the second - IN. (pins 6 and 7) , but do you also run the wire from the 1M resistor...
  2. SparkyCal

    Distortion Pedal Redux

    I'm not sure AG. Good observations. If you're willing, we can give this a try and see where we land. Let me know.
  3. SparkyCal

    Distortion Pedal Redux

    @AG More like a hiss that clobbers the signal. Thanks Bertus for the link. I will check it out. In the interim., I am thinking: Why don't I try following this video. I know we have looked at this before, but because it is narrated, it could be a good way to find out what the heck I am...
  4. SparkyCal

    Distortion Pedal Redux

    AG: as I could not get the curcuit we were working on to work, I based the modular approach on the original schematic that it on this thread. It is difficult to discern the sound, with all the noise. To me, it does not come across as loud or distorted. It almost sounds clean. But obviously...
  5. SparkyCal

    Distortion Pedal Redux

    Well, the modular circuits work, but there is a catch. They actually do produce sound, but it does not have much distortion in it. Unplugging the diodes does not seem to make a difference.If it does it is only slight. I am thinking that it is due top what AG said- that the wires and stuff may...
  6. SparkyCal

    Distortion Pedal Redux

    AG. I have built 90% of the modular thing. My goal,would be just to make sure the build works. If it does, I will build on a pcb and eliminate the noise issues. Or are you saying that the approach will fail outright and not produce sound even if it wired correctly?
  7. SparkyCal

    Distortion Pedal Redux

    Well AG and friends, we certainly cannot be faulted for lack of trying. Tomorrow, I may try the 741 just to see what might happen, although based on your comment AG, it may fail simply on not enough voltage supply. But I will report in once I try it. On another, but related note, I am also...
  8. SparkyCal

    Distortion Pedal Redux

    I will try the 741cp later when I get a minute. I quickly measured the pins on the socket, without the op amp in. Many of the measurements would not keep still. They seemed to be counting down into the negatives. Will take firmer measurements later and post them. If we take the op amp out of...
  9. SparkyCal

    Distortion Pedal Redux

    Hi AG Yes, I did wire up the 220K between pins 2 and 6. The green 10nF capacitor that I used is placed immediately when the guitar signal comes in. I can try swapping ther Op amp with a 741. I believe they have the same pin maps. I can try that later and report in. I can't explain why Pin 8...
  10. SparkyCal

    Distortion Pedal Redux

    Still no sound. For the 10nF capacitor, I used a green film capacitor.Could that have caused a problem?
  11. SparkyCal

    Distortion Pedal Redux

    I managed to find a ceramic capacitor at 100pF. It has the number 101 marked ion it. I hope that'a correct. I once tried to find a chart listing the cermanic capacitor numbers and their values, but it was hard to find. I once read something and understood how to decode the values, but I have...
  12. SparkyCal

    Distortion Pedal Redux

    I am embarrassed to admit that I also forgot to wire Post 2 to pin 2. ;-(. I will fix that too and report back.
  13. SparkyCal

    Distortion Pedal Redux

    Hi AG My mistake. I meant to say parallel, but I said series., Rest assured, they are wired correctly. you are absolutely right about the missing 220K negative feedback resistor. I think I was so fixated on setting up the Pin 2 and 6 posts, that I forgot to do that loop. I will fix that and...
  14. SparkyCal

    Distortion Pedal Redux

    Hmmm... I built this circuit without pots. I have no sound coming out. Here are my Pin readings in Volts 1. 1.43 V 2. .509 3. 4.50 V 4. 0 V 5. 1.08 V 6. .2.5 and falling 7. 9.3 V 8. 8.45 V I wonder if this has anything to with how I am wiring Pin 6. Pin 6 calls for it to branch out two...
  15. SparkyCal

    Distortion Pedal Redux

    I have always used a film capacitor for the 100pF. I will have to look for a ceramic one. If I don't have ceramic, is film ok? Thank-you
  16. SparkyCal

    Distortion Pedal Redux

    AG. Sorry for all the questions but I am proceeding oaths build faster that I had thought I would. I now also have the 220 K resistor installed between pins 2 and 6. Should I install the diodes and the 100pF capacitor ( C31 from original schematic), under the 220K resistor and before the 1K...
  17. SparkyCal

    Distortion Pedal Redux

    The bund has begun. I have the voltage divider built, I installed the socket for the op amp I hooked up the + power to Pin 7 I hooked up the - to Pin 4 I ran the appropriate wire to Pin 3. Without the op amp inserted into the socket, I am getting a reading of 4.5 volts at Pin 3. Does that...
  18. SparkyCal

    Distortion Pedal Redux

    One thing I am unclear on: when should I use film capacitors vs. electrolytic? I have a supply of both kinds.
  19. SparkyCal

    Distortion Pedal Redux

    Hi AG. Thanks. To be safe, I will work with the schematic you just posted.
  20. SparkyCal

    Distortion Pedal Redux

    I need to start from scratch again. I decided I was going to do a barebones version first. This meant working from the attached schematic. Although I got that much of the circuit working, it turns out that I got myself confused going from the barebones, to the full blown version, and screwed...
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