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kevin gilmore

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kevin gilmore last won the day on May 10 2023

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  1. wink

    Have you heard of Ideal Diode Bridge Rectifiers?

    Regards, old retired fogey.

    1. kevin gilmore

      kevin gilmore

      yes i released a board like 7 years ago.  4 mosfets and a driver chip

  2. kevin gilmore
    this is why i have 4 sets of tires for 2 cars. seriously under 40 degrees F is death for summer only performance tires. besides which the tires will crack and then you have to throw them out.
  3. kevin gilmore
    koss pro4a ? definitely koss
  4. mross started following kevin gilmore
  5. kevin gilmore
    with the sanyo transistors 5v results in about 500ma bias. which was the original design spec for this board.
  6. kevin gilmore
    you need to measure the voltage across q36 should be about 5 volts. if not adjust rv2 and if that is not enough change r36
  7. kevin gilmore
    minimum power supplies +/-24 might have to change a couple of resistors in the bias generator for this output transistor.
  8. kevin gilmore
    what is the name of the gerber file for the output board
  9. kuran started following kevin gilmore
  10. kevin gilmore
    super thin traces are never a good idea. just ask cavalli.
  11. kevin gilmore
    yes the distance matters. always put caps as close to the chips as possible. probably need a scope to see whats happening to the power rails. possibly one of the diodes on the input lines is in the wrong direction.
  12. kevin gilmore
    solder on some .1uf caps on the power supply lines on each chip close to the pins. also no diodes that i see across the relay coils.
  13. kevin gilmore
    much better. max sensitivity of the qa403. 60 hz and multiples are very hard to remove, moving wires around in the box and things will change. completely inaudible. the synchronous rectifiers may take out even more noise. mumetal shielding around the transformer is also a good idea. glad that more and more people are buying the qa403. higher quality diy coming soon
  14. kevin gilmore
    might want to try again with a good quality mylar cap say 1uf in series with the power supply outout. you should be able to get better resolution.
  15. kevin gilmore
    need to see the whole board. definitely missing the power supply caps at the lm339
  16. Victor Chew

    Hi Kevin,

    Victor here. I have been missing in action for a long time. I hope you are keeping well and thank you for your selfless contribution to us.
    I have not completed my megatron amplifier but I intend to do so soon. I notice that my power supply has a +15 and -15v but the megatron only has a +15. Does that mean that I only have to connect the -15 and leave the +15 unconnected? Mine is the earliest megatron boards.

    1. kevin gilmore

      kevin gilmore

      current source needs -15 i think.

    2. Victor Chew

      Victor Chew

      Thank you very much

  17. kevin gilmore
    pretty close to production now.
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