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kevin gilmore

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Everything posted by kevin gilmore

  1. all transformer leads need to be twisted and soldered. and then cranked down good
  2. you need to lower the value of the resistor in series with the offset pot.
  3. kimchi ---yum my local Korean grocery store has like 7 different kinds some in buckets equivalent to a gallon or more. But I would rather have the steak
  4. all the equi=tech are torroids torroids will have less magnetic flux leakage, but will have a turn on thump probably easier to find the EI versions surplus on ebay for far less than you can have one made for.
  5. 10 to 15 ma for the driver board, and 25ma for the output board. But i have tested to 50ma and the heatsinks definitely get toasty that way. No difference in sound after about 25ma
  6. the rest of the power in the circlotron is pure AC for the filaments, so not much of a turn on whoosh either
  7. the way the board is layed out currently its really input -> attenuator -> ubal/bal -> diamond buffer because there is only one set of servo's and the attenuator is best at something like 10K
  8. unbalanced to unbalanced, gain of 1 unbalanced to balanced, gain of 2 etc you can adjust the gain by changing the 1300 ohm resistors, or the emitter resistors up to 10x is possible with no increase in distortion these days, I don't think there is any reason to add much gain
  9. remember that there is both a dynamic and electrostatic current feedback amp. using the bh power supply on the dynamic amp is going to result in much magic smoke.
  10. final dns change monday morning machine will end up on 165.124.198.148 and dns will change a few hours after that 2/1/17 edit, final networking address, should stay this way till i retire
  11. highest hfe, make sure to match hfe and vbe
  12. i have not touched that one in a while. don't see any reason to, i like it the way it is
  13. transistors are 2sc3324 and 2sa1312
  14. posted final smt version of the ubal to bal board. the smt boards should be cheap because they are tiny, ubal board is 2.42 x 2.12 and the diamond buffer is 1.46 x .8 I would like 4 of the ubal boards, and 8 of the diamond buffer boards please
  15. that was not a buffer. that was a 60 watt + power amp done with semisouth as output devices.. It was pretty nice for a small chip amp.
  16. probably close to final 2.45 x 2.17 inch
  17. lm49830 is a chip amp do you mean opa1632 and its clones, all of which require huge amounts of feedback and have all sorts of common mode dc issues
  18. diamond buffers will stand vertical on that board. there are thru hole versions of both pieces already
  19. moar better 2.65 x 2.27 inch
  20. some people are going to have trouble assembling this, same size for comparison see updated picture below
  21. yep, gets the output impedance down to say 5 ohms. then you can add some resistance to match the cables you intend on using, +45 or +70 ohms
  22. for soren, thru hole version with servo
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