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kevin gilmore

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Everything posted by kevin gilmore

  1. kevin gilmore
    that is just one of the caps, there are 4. so up to say 500 joules
  2. kevin gilmore
    old power supply (per rail) (just the unregulated primary) 680uf x 2 caps in series, about 600v. total energy storage 61 joules new power supply 500v 1 x 680uf cap total energy storage 85 joules so you can certainly get away with 470uf which is 58 joules and that one is only 60mm high but if you are insane, you can go with the 1000uf cap which is still 40mm diameter but 105mm high and get 125 joules I'm clearly a fan of overkill, but 125 joules is in the range of a heart defibrillator (memories of Mikhail and his 4700uf/450V juice can caps) run at almost 500v and then he put 2 In parallel
  3. kevin gilmore
    version 3 board ready for testing slightly updated servo schematic the taller caps are really useable in 3U boxes
  4. kevin gilmore
    i have finally come up with a better servo, joamat and kerry had some really good ideas, but referencing the minus rail causes issues, and then there is the overhead voltage of the system. so here is something that i think is better because the reference is ground. http://gilmore.chem.northwestern.edu/newservo.pdf the circlotron needs a bigger chassis than that. and its probably too big for the carbon, but sure why not. going to look into transformers very soon.
  5. kevin gilmore
    its one small sink that holds both of them. http://gilmore.chem.northwestern.edu/fatright.jpg
  6. kevin gilmore
    a lot of people don't lift the resistors slightly off the boards, and cause trouble. i can certainly put the ground plane back in if people want it, but the design is very tight and short, so probably no reason to. here is what the ground plane would look like with 30th clearance, there is no way to do it on the bottom. http://gilmore.chem.northwestern.edu/kgsshvcarbonv2.pdf takes 5 seconds to put it back on the board if people want it. no way to get to the ground pin on the ground plane for the hv power supply connector
  7. kevin gilmore
    with the fat power supply boards, definitely fits in this one http://www.ebay.com/itm/NEW-DIY-BZ4309-Full-Aluminum-Enclosure-power-amplifier-box-dual-heatsink-chassis-/261938269078?pt=LH_DefaultDomain_0&hash=item3cfcbccb96 iec hole already in the back panel
  8. kevin gilmore
    the fat supplies are now exactly the same size as the amp boards all the mounting holes in exactly the same place. 5.45 x 4.05 inches fits in the dissipante 2U box with the boards mounted horizontal with ample room for transformer, or 3U box with the boards mounted vertical, and even more room for the transformer. the skinny supplies are 3 x 6.5 inches which is a tougher fit in many boxes.
  9. kevin gilmore
    that is unnecessary but i could probably do it. the result would be that those parts would get hotter. i have updated the fat boards to be exactly the same size as the amp boards, makes doing the bottom panel easier with the fat power supply boards, definitely fits in this one http://www.ebay.com/...=item3cfcbccb96 iec hole already in the back panel
  10. kevin gilmore
    if you have the time check every one of them, but all i did was change a couple of silk screen labels, and a couple of .6 resistors into .5 which are easier for people to bend. the others are just cut and paste from the original
  11. kevin gilmore
    too much variance in the parts so you measure the voltage across the testpoints which is a 150 ohm resistor. 3 volts == 20ma
  12. kevin gilmore
    you would be surprised how little time these boards take to make. but but but ray samuels says that gerber files are tens of thousands of dollars each
  13. kevin gilmore
    here you go http://gilmore.chem.northwestern.edu/alpsrk50.jpg http://gilmore.chem.northwestern.edu/boards/alpsrk50.zip
  14. kevin gilmore
    one pair of amp boards and one pair of fat power supply boards or 1 dual power supply board.
  15. kevin gilmore
    done, all 5 versions of the power supply fat versions are 5.45 x 4 inches now to find 3U narrow box the fat supplies would work in the 2U next to the amp boards here it is with the fat power supplies in the 2U dissipante chassis http://gilmore.chem.northwestern.edu/chassis2.jpg
  16. kevin gilmore
    did not know that, makes it easier amp board 5.45 x 4.05 inches 211 holes psdual board 6 x 6.48 inches 287 holes ps single boards 3 x 6.48 inches if there was a 3U heatsink chassis that was only say 10 inches wide on the inside I could do the power boards for that.
  17. kevin gilmore
    here is the final stuff unless someone finds an error http://gilmore.chem....shvcarbonv2.jpg http://gilmore.chem....fetdual2new.jpg http://gilmore.chem....fetdual2new.zip http://gilmore.chem....shvcarbonv2.zip remember on the +/-15 regulators, the tabs are hot, so insulators on both parts, and either plastic screw, or metal screw with the plastic rings on both sides.
  18. kevin gilmore
    i will be updating the v2 amp board and dual power supply boards shortly. increasing the distance on the heatsink to .8 inches so that the heatsink completely covers the metal part of the fet and shrinking the amp board slightly. here is the final stuff unless someone finds an error http://gilmore.chem.northwestern.edu/kgsshvcarbonv2.jpg http://gilmore.chem.northwestern.edu/kgsshvpssicfetdual2new.jpg http://gilmore.chem.northwestern.edu/boards/kgsshvpssicfetdual2new.zip http://gilmore.chem.northwestern.edu/boards/kgsshvcarbonv2.zip single version boards updated amp board 5.45 x 4.05 inches 211 holes psdual board 6 x 6.48 inches 287 holes ps single boards 3 x 6.48 inches
  19. kevin gilmore
    those are fine current limit is .75 volts across the 10 or 5.1 ohm resistor, or whatever value you stick in there
  20. kevin gilmore
    yep, exactly like it works on the original supply
  21. kevin gilmore
    I could always cut the footprint out of the stax t2 board, and add a couple of connectors, but you would have to make the boards yourself.
  22. kevin gilmore
    330pf caps are 1kv on the old power supply 2 caps were in series with a resistor on each cap, so the voltages just made the ratings of the resistors, actually slightly more than ratings on the 500v supply. the new supply is only one cap, and that would exceed the voltage of a rn60 so the 3 watt (or 1 watt) things are actually rated for voltage. obviously you need only .5 watt could go with 2 resistors in series, room for that. sorenb wants to use the higher quality lv supply. don't know if it makes any difference, but the lower noise might definitely make it better.
  23. kevin gilmore
    I would definitely go with the 550v caps. depends on the voltage range of your power. if you go with standard voltage +/-5% you might squeeze in to the 500v but if its standard voltage +/-10%, that's pushing it.
  24. kevin gilmore
    change the value of the 2 resistors in series on the other side of the reference. the 47uf are tantalum capacitors, and 35v is fine. just in case the zener has to go up to 24v
  25. kevin gilmore
    http://gilmore.chem.northwestern.edu/boards/kgsshvpssicfetsinglenewleft.zip http://gilmore.chem.northwestern.edu/boards/kgsshvpssicfetsinglenewright.zip
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