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  1. SparkyCal

    Back to the Breadboard

    Thanks AG. I don’t know why I thought it was 100pF. Maybe because 103 is printed in it. Oh well. Good to have in the inventory.
  2. SparkyCal

    Back to the Breadboard

    I decided to buy a bunch of 100pF capacitors, as the circuit I've been working on in this thread requires one such capacitor. I had been using a 100pF ceramic capacitor. Being short on them, I ordered these...
  3. SparkyCal

    Op Amp Substitute?

    The LED is basically used by the guitarist to take a quick glance to make sure the box is working and activated. I suppose if you look at anything too long, it will be annoying. You may be right however. If it turns out to be an issue, I can always swap it out.
  4. SparkyCal

    Op Amp Substitute?

    Thank Bertus. Yes, I see there are a few files with theremin schematics and explanations. I have a growing list of potential projects that I'm not sure I'll ever get to lol. But great to have choices. I think my next venture, is to try to use everything I learned about pedal building, and try...
  5. SparkyCal

    Wire

    Digital calibre shows .028 inches It seems to take solder. I don't know how to tell if it has a copper core. I have attached a pic of it. I scraped it with a knife and I don't see any copper. It just looks silver right through.
  6. SparkyCal

    Wire

    I was going to buy 22 gauge wire to make breadboarding leads. I happened to be at the dollar store and bought 6 spools of wire for $4.50. The wire is thin, silver and solid (no strands). It is the perfect fit for breadboard holes and it came in red and black sheathing. I am wondering if this...
  7. SparkyCal

    Op Amp Substitute?

    Sounds like this can’t happen unless I has two of those chips. Thanks for the advice.
  8. SparkyCal

    Op Amp Substitute?

    I was going to attempt this, but there are two problems: 1. I only have one 4093 chip, however, it came in a kit that has one 4093 chip and one 4094 chip. I am not sure if the 4094 can be used in place of the second 4093? 2. I also note that his data sheet calls for 2 10K potentiometers. but...
  9. SparkyCal

    Op Amp Substitute?

    Do you think I can use a 4558d op amp, in place of the op amp called for in this circuit? https://www.instructables.com/Make-Your-Own-Simple-Theremin/ Thank you
  10. SparkyCal

    Back to the Breadboard

    Thank-you. I though it was some sort of component.
  11. SparkyCal

    Back to the Breadboard

    Thanks VB
  12. SparkyCal

    Back to the Breadboard

    Does anyone know what the letters GRN stand for on this schematic? Look to the right and left of R1-C https://www.nutsvolts.com/uploads/magazine_downloads/FA_1008_metro_fig1.jpg
  13. SparkyCal

    Back to the Breadboard

    Sorry. Thought you meant a different pot. My other breadboard has the same build but is much quieter. Wonder if it’s the board
  14. SparkyCal

    Back to the Breadboard

    Reduce the pot to what value?
  15. SparkyCal

    Back to the Breadboard

    Weird I built this circuit on my new breadboard, and the circuit works. HOWEVER, I am getting this strabn=nge UFO sounding frequency coming through ther circuit and into the guitar amp. I recorded it. Have a listen. Any ideas how to eliminate it? Very loud and annoying...
  16. SparkyCal

    Requesting Ideas for my Next Venture

    Will put it on list. Thanks
  17. SparkyCal

    Requesting Ideas for my Next Venture

    Thanks Bertus. That looks doable
  18. SparkyCal

    Requesting Ideas for my Next Venture

    @AK- is there a schematic. I've looked. there are some out there, but most are overly convoluted.
  19. SparkyCal

    Breadboard Question

    Thanks for the explanations and pictures. I will check the gap and use jumpers if need be. it reminded me of one time, I built the distortion circuit perfectly but it would not work. After racking my brain for an hour, I noticed that the cable was not plugged into the guitar. Lol
  20. SparkyCal

    Breadboard Question

    Hi Guys.... I bought a bigger breadboard. Here is the one I bought: https://www.amazon.ca/gp/product/B00KHE7O7Q/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1 I am wondering what the two busses on the top are used for. Presently, I am using the top horizontal buss to run my + and - to the...
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