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  1. SparkyCal

    I'm Back- sort of

    Hi Bertus and my other friends here. You may recall that after an almost daily presence on this forum, I packed it in with my interest in electronics. However, I am revisiting this interest and have assembled a portable, multi shelf unit on wheels, that houses a scaled down version of my...
  2. SparkyCal

    Back...sort of...

    Thanks...will give that a try
  3. SparkyCal

    Back...sort of...

    Hi...I got lucky an I found an antenna wire in my junk. I hooked both ends of the wire up to the Antenna screw. It now gets me almost all of the AM stations- which is great. I don't get many other stations on the other bands though. Thanks for the links and diagrams. I may try making one of...
  4. SparkyCal

    Back...sort of...

    Well, I'm back...sort of... I am still not pursuing electronic projects and circuits for the time being. However, I probably will have household type electronics questions along the way, and what better place to ask, than here. I have a very old Phillips antique radio that my dad passed down...
  5. SparkyCal

    Farewell

    Hi...yes, I am sure I'll be back in time. Stay safe everyone. Cal from Canada
  6. SparkyCal

    Farewell

    I thought I would let you know that I have shelved electronics for now, and have taken down my lab. It's not that I have lost interest. It's more that I am finding that I don't have the time it takes to succeed at it. Also, there is no escaping the fact that not having a formal education in...
  7. SparkyCal

    New Stompbox Project

    s So I should replace R 8 and R9 in the pic I just posted, with two 3M resistors?
  8. SparkyCal

    New Stompbox Project

    Thanks again for taking the time to provide links and to explain these concepts to a newbie. I appreciate it. Presently, I have the following circuit built as my power source of the LF353. (see attached). Do you think it will suffice?
  9. SparkyCal

    New Stompbox Project

    Maybe this explains it? http://www.ecircuitcenter.com/Circuits/op_ibias/op_ibias.htm
  10. SparkyCal

    New Stompbox Project

    I have a feeling it’s this Input Bias Current: The current that flows into the input pins to bias the transistors (about 80nA in this case). Note: Some FET op-amps have input bias currents well below 1pA. I got This from a data sheet explanation for a particular op amp if this is true, what...
  11. SparkyCal

    New Stompbox Project

    Hi guys . Bear with me as I am trying to push myself to learn a particular aspect this time around. Here is what i want to learn: I want to learn more about reading data sheets. I know each Op amp requires a certain amount of bias current or voltage at its + pin (usually pin 3) Questions 1...
  12. SparkyCal

    New Stompbox Project

    Alec. I would not know how to find one of those
  13. SparkyCal

    New Stompbox Project

    Great advice Harald and Alec. Thank you. I have been away on vacation and I had forgotten that it is the diodes that are worth tinkering with to get different distortion flavours. I used to know that. Thanks for reminding me. I guess my question is, if I want to continue to use those...
  14. SparkyCal

    New Stompbox Project

    hmmm. I noticed that the LF353N op amp has a Power Supply Voltage (VCC) of 18volts I assume its Pin 8 will need 18volts, but how do i know what the + Input requires in terms of its biasing? Can someone tell me where in it data sheet, I can find that out? Here is the datasheet...
  15. SparkyCal

    New Stompbox Project

    So, I have decided to try another guitar pedal project, but first. I have a few questions: I decided I will use the attached schematic as my template. What I mean is that I will use this schematic as my starting point, but I will be making changes to it- hence my questions: I recognize that...
  16. SparkyCal

    The Theremin Stretch

    Hey guys...as mentioned, I will be leaving soon and back Sept 7th. I don';t think i will have time to trouble shoot the theremin. between now and then, but plan to get back to it, when i return. Bertus- I also plan to read about theremin design, when i am away. I figure, if I can better...
  17. SparkyCal

    The Theremin Stretch

    I believe I have because the previous ones I used have the same pin out mapping as the j110s. As I already had adjusted the components to comply, I just had to swap them out
  18. SparkyCal

    The Theremin Stretch

  19. SparkyCal

    The Theremin Stretch

    Funny- still no sound. R 12 and R 42 continue to show zero volts. Is there anyway of breaking this down and testing voltages at certain junctures to determine where the breakdown is?
  20. SparkyCal

    The Theremin Stretch

    Very cool. Makes me want to buy one
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