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kevin gilmore

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Everything posted by kevin gilmore

  1. kevin gilmore
    and then you have to change the driver power supply to +/-350
  2. kevin gilmore
    yeah, there is about 5 volts of offset, no biggie board posted there are 3 resistors in series for the feedback and its 890k total on the board. no, you definitely should not try to use this as a dual voltage supply because only one side is regulated. like this http://gilmore.chem.northwestern.edu/circlotronhvpowersinglenew.jpg
  3. kevin gilmore
    should you actually find music that will drive the amp at the speeds necessary, the output stage will drop out of class A and go into AB.
  4. kevin gilmore
    this is the new power supply schematic. i like it much better than the previous version. new board soon http://gilmore.chem.northwestern.edu/goldenreferencehv900new.pdf runs on much less voltage, so for the dht amp running at 50ma, less heat also less noise than the old version, and no pile of zeners
  5. kevin gilmore
    try not to do it hennyo style!
  6. kevin gilmore
    its low voltage, so standard silicone pad is just fine. takes up about 25th, so no room necessary
  7. kevin gilmore
    has to suck the heat from somewhere the heated heatsinks cause airflow
  8. kevin gilmore
    got something back from kemet that says their pdf is way out of date, and many of the sizes are 2 pin, but some are 4 pin. seems that mouser does not have the 4 pin in stock, but can order them, they would be a bit cheaper if we buy 100 or more. the layouts are updated just in case anyway.
  9. kevin gilmore
    kerry changed a few values from the original schematic, changing the labels on the boards now http://gilmore.chem.northwestern.edu/goldenreferencehvsic.pdf R1 to 4.7k (probably a good idea) D1 12V R6 to 50k (also probably a good idea) C7 down to 5pf (and yes it needs to be there) 3.9 ohms for R11 if you want to raise the current limit
  10. kevin gilmore
    holes, lots of holes top and bottom
  11. kevin gilmore
    kerry, you need a screen room, all copper you know you want one. do the entire apartment and wear an aluminum hat.
  12. kevin gilmore
    for signal input, unbalanced you put hot to amplifier input + you put ground to signal ground and input - for output you wire hot to amplifier out + and you wire ground to signal ground anything else, and bad things happen
  13. kevin gilmore
    calculate the power, and its pretty low. now sensitive iem's might be a different story, but you would be nuts to run those on this amp.
  14. kevin gilmore
    .5 volt sure seems reasonable to me. but all you have to do is change one resistor to make it anything you want.
  15. kevin gilmore
    if you are having power supply boards made make sure the board files have todays date on them or later. the new capacitor footprint should take care of any possible cap you can shove in there.
  16. kevin gilmore
    the following files have been updated with both footprints, please check for errors ...newleftfat ...newrightfat ...circlotronhvsingle there seem to be multiple errors in the kemet pdf for example size codes f and k do not exist http://gilmore.chem.northwestern.edu/circlotronhvpowersingle.jpg if you are planning on making any of the power supply boards make sure they have today's date or later on them. if not ask.
  17. kevin gilmore
    for the 550v caps there is conflicting information whether they are 2 lead or 4 lead, trying to find out real information, I think they are actually 4 lead. updating all layouts with both the 2 and 4 lead versions
  18. kevin gilmore
    its really no different than the kgsshv, its the same +/-450v output swing. and the 900v supplies are the same as the original supply, they just float. no big deal, nothing to see here, move along. made the single power supply a bit smaller. 5.95 x 4.35 inches by the way, the pdf of the kemet capacitors specifically says they can be mounted in any position.
  19. kevin gilmore
    if it fits, it fits. not a bad idea to do the hv power supplies horizontal and stacked depth might be an issue
  20. kevin gilmore
    I have seen bigger caps than the 470uf caps mounted horizontally, so I'm sure its ok. a singles version of the 900v supply would be 5.95 x 4.5 inches http://gilmore.chem.northwestern.edu/circlotronhvpowersingle.jpg so each side of the heatsink with everything mounted vertically from the front would be driver board output board 900v power supply 900v power supply hv power supply so minimum height of the heatsink needs to be 5.95 inches and the boards stick out a maximum of 4.5 inches definitely fits in the 5U box ?? transformers on the back panel?? 2 inch spacing between the driver and output board then 3 inch spacing on the power supply boards (or whatever the cap height is)
  21. kevin gilmore
    its the old power supply because the voltage exceeds the capabilities of the new supply. 16 offboard caps is not going to be easy. plus possible issues with the breakdown voltage of the insulation of the capacitors when mounted in capacitor mounts. driver board is modified kgsshv-carbon board with stuff missing. newest posted boards, aligned the opto connections between the 2 boards, designed to wrap around from board to board
  22. kevin gilmore
    more than acceptable numbers. no way to perfectly match the p and n parts
  23. kevin gilmore
    messed with the feedback a bit and moved all the stuff back to the driver board board files updated output board schematic updated just in case you people think this is a monster... we could do a megatron with 845's its super simple. But brutally expensive and huge. at some point a se 845 with transformer, my take on franks beast a dynamic amp, same thing
  24. kevin gilmore
    i have a number of things at work that use these to246 parts. all of them are spring loaded to a thicker than normal silicone pad, no hole. i posted a picture of my original prototype, has the same things. this thing runs at about 2.5kv, so it must work. http://gilmore.chem.northwestern.edu/kgsshvcarboncirc.jpg what i will be doing for the carbon is the same thing, except i will have a bracket over the to246 devices, with 3 holes, and the 2 x to246 in the middle, then tighten from below. i also don't know where to get sheets of that silicone shown above unless i can find the numbers on the spring retainers, i have a few, but don't know where to buy them. same thing would definitely make sense if you are going to attach directly to heatsink.
  25. kevin gilmore
    it probably makes more sense to move the opamp stuff from the output board back to the driver board, makes it easier to wire, going to look into that now.
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