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kevin gilmore

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Everything posted by kevin gilmore

  1. kevin gilmore
    you need 2 fat boards plus 4 of the hv boards for a circlotron
  2. kevin gilmore
    fat boards are needed for the circlotron. does not make sense to mount the power supplies vertical when you have to mount the boards horizontal in a 2U
  3. kevin gilmore
    i'm assuming that is for a balanced pair?
  4. kevin gilmore
    congo5 building and troubleshooting now. updated th.zip and thps.zip and th.jpg + and -15 flipped and -5 cap on amp board flipped all fixed. congo5 says its working now. one other thing, because of the tube, a warmup circuit or better, and output protector is required th2.zip has the output protector on the boards
  5. kevin gilmore
    yes an answering machine. that was almost 20 years ago. at the time i had 3 phone lines, now i have one, and its on a hardware blocker. But the merlin-20 is still hooked up to every single room in the house. Still works 30+ years later. i will bet the at&t does not build stuff with that quality anymore.
  6. kevin gilmore
    well they weren't anything like that much when I bought them, maybe $50 now this on the other hand... http://gilmore.chem.northwestern.edu/bigger2.jpg
  7. kevin gilmore
    i have a pair of mitutoyo absolute digimatic, not sure how much i paid, both are 4+ years old, no problems yet.
  8. kevin gilmore
    very nice
  9. kevin gilmore
    maybe the exploding caps on a couple of demo units coupled with hearing the switching noise every 20 seconds finally put him under. A solution in search of a problem that never existed. goldenreference power supply is infinitely more quiet, and about 10% of the board space. just can't put 10 supercaps in series without all sorts of special circuitry. and they say so in the pdf. sooner or later one of the caps is going to hit 2.6 volts, then ka boom. evidently the Vinnie rossi LIO website is still up and selling that pile of crap. $6155 for the full up version, ouch. and with respect to the darkstar, one rather famous person named the thing "Le Grande headache" but it could set a pair of he6 on fire...
  10. kevin gilmore
    I did not expect to buy a new mattress, but one of the air bladders was leaking, so went to mattress firm and ended up with the tempur-pedic, hardest one of the bunch. same day delivery, drag the oldest mattress away... the ones with the cooling gel were way too soft. the comfortaire was 12 years old. will see how long this one lasts. latest thing is 100% waterproof mattress toppers as an add on.
  11. kevin gilmore
    yes they are the gull wing parts, and the layout is exactly as specified in the pdf.
  12. kevin gilmore
    it does all fit, not by much http://gilmore.chem.northwestern.edu/attenuatorsmtv4.jpg 50 ohm resistors and smt caps added
  13. kevin gilmore
    the new board uses 1206 I might be able to lay 0805 on top of the 1206, not sure how great an idea that would be. other than the connectors, the entire board is surface mount only. I could even do the connectors as surface mount, also probably not a good idea. edit: I take that back, the capacitors are thru hole... but I could fix that too.
  14. kevin gilmore
    the V2 version of the attenuator is surface mount only resistors, and the chips that drive the relays need different software. the original boards while not hardware compatible with amb's attenuator are in fact software compatible with the lcduino. relays with 2 coils were used. the v2 boards use single coil relays and pull up resistors, same as amb's attenuator. but the driver chips are different and require 32 bits clock + data
  15. kevin gilmore
    all are the same design, the first one has on board to3 transistors. you can always use the goldenreference4 and mount the to3 transistors on an external heatsink.
  16. kevin gilmore
    you increase the resistance, not decrease it.
  17. kevin gilmore
    3 oz copper might be better for the power supply boards, harder to destroy lands that way. although with that much capacitance, copper is gonna fly no matter what if you do a hard short
  18. kevin gilmore
    for the V2 attenuator, there was one missing wire, will fix soon. fixed http://gilmore.chem.northwestern.edu/boards/attenuatorsmtv2.zip http://gilmore.chem.northwestern.edu/attenuatorsmtv2.pdf
  19. kevin gilmore
    only for the bipolar version do you need 10k, otherwise anything works. schematic, nope never did one, 2 x pcf8574 driving 2 x uln2803 latching relays.
  20. kevin gilmore
    all the boards I have ever had made were pcbnet, no issues yet.
  21. kevin gilmore
    oops, forgot to mention i will pay for my boards.
  22. kevin gilmore
    for multiamp, you really want the 10k version.
  23. kevin gilmore
    finally cleaning up, i have one extra set of the original attenuators, part of the buy that kerry did, professionaly assembled, and i tested them last night, so if anyone is interested i can sell that pair. Price is whatever kerry charged, which might take me a while to look up.
  24. kevin gilmore
    ray is still trying to sell his business. I think he is down to about $1M by now. I know for sure 3 people/companies he has offered it to, and all were smart enough to turn it down. pretty sure his 15 minutes of mil-spec fame are over. Very over.
  25. kevin gilmore
    if you are comcast you definitely want the 6121 or 6141, as of last week in chicago they upgraded the firmware, so everything is fully ipv6 compatible. Also getting 90mbit now. and the big netgear for the wireless or something similar so that ipv6 works correctly too.
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