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kevin gilmore

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Everything posted by kevin gilmore

  1. kevin gilmore
    kerry, you need a screen room, all copper you know you want one. do the entire apartment and wear an aluminum hat.
  2. 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
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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
  8. 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.
  9. 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
  10. 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)
  11. 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
  12. kevin gilmore
    more than acceptable numbers. no way to perfectly match the p and n parts
  13. 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
  14. 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.
  15. 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.
  16. kevin gilmore
    the current hv power supply is a dual board designed for one channel depending on how you assemble, you can put some of the terminal blocks on the back of the board, especially if mounting vertically. so you could put the output stage board right next to the power supply board and put the power connectors on the output stage board on the back for very short wiring
  17. kevin gilmore
    you need 4 x 900v floating power supplies (could split into singles if it makes more sense) 2 x 450v ground referenced power supplies (likely the fat power supplies) 2 x 15v ground referenced power supplies (on one of the fat power supplies) 1 x bias (on one of the fat power supplies) board files posted circlotronhvpower.zip kgsshvcarboncirclotron.zip kgsshvcarboncirclotrondriver.zip
  18. kevin gilmore
    how to get it in the box, I don't know for sure yet. what I do know is that I have the opto bias working perfectly and a stereo prototype that I can listen to. (well at least on the bench, no way to move it) its flat out amazing. As much fun as listening to the T2 for the first time. did some testing at 1kv peak to peak into 50k(50w) in parallel with 470pf. just fantastic. till the cap exploded at 20khz. switched to the 1kv rated terminal blocks which are a fair bit bigger, but not much more money. as far as I know the only push pull solid state electrostatic amp ever. (parts for togte are not available) output board schematic http://gilmore.chem.northwestern.edu/circlotronoutput.pdf board size 5.45 x 4.05 inches driver board same as kgsshv-circlotron with a few resistor changes picture http://gilmore.chem.northwestern.edu/kgsshvcirclotrondriver.jpg board size 5.45 x 4.05 inches picture with the 1kv rated terminal blocks http://gilmore.chem.northwestern.edu/kgsshvcarboncirclotron.jpg likely going to use the other opto to make a safe current monitor new power supply picture with the 1kv rated terminal blocks http://gilmore.chem.northwestern.edu/circlotronhvps.jpg board is 7.45 x 6.48 inches also you need the 2 x fat power supplies thinking of 3 transformers, 2 of which have 5 hv windings (4 for the 900v and 1 for the hv supply) and then one small transformer for the +/-15 supply
  19. kevin gilmore
    yes I have to to get it in the box but currently the 900v supplies are too big not sure what to do about that yet the 1kv connectors are huge, but have not found suitable wire yet. the 5kv wire is a bit hard to work with.
  20. kevin gilmore
    its an ultra quiet and extremely stable power supply. the on board version is suitable for just about anything however, does not care. kind of overkill for kgsshv etc but there still is nothing better. how many are interested in this? http://gilmore.chem.northwestern.edu/kgsshvcarboncirclotron.jpg
  21. kevin gilmore
    yes, and most of them are completely clueless. its going to get worse. i just posted the final schematic for the circlotron output board, and will probably have a board layout by monday. 350 volts per microsecond!
  22. kevin gilmore
    for the kgsshv that opto servo has at least half the peak to peak range. reason it exists is that its used as the current control in the latest version of the circlotron. thinking of applying latest ssdynalo design elements to the dynahi but thats going to be a bit. in other news, this is likely the final circlotron output stage, output stage current setable with a pot. http://gilmore.chem.northwestern.edu/circlotronoutput.pdf and then this http://gilmore.chem.northwestern.edu/kgsshvcarboncirclotron.jpg lots of realignment work to get this to match the driver board
  23. kevin gilmore
    for the megatron, the two tubes are in series and warm up together (well close) so there is not going to be a big bump
  24. kevin gilmore
    cleaned up schematic for both versions http://gilmore.chem.northwestern.edu/kgsshvcarbonproduction.pdf
  25. kevin gilmore
    for megatron this may not be a great idea because the boards will trigger at slightly different times causing a huge output bump into the headphones if they are connected.
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