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kevin gilmore

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Everything posted by kevin gilmore

  1. suggest you buy the transistor tester meter on ebay, cheap and the best way to test them before you stuff them in the boards and then find out they are not real.
  2. those are vertical mount resistors to keep the board size down
  3. http://gilmore.chem.northwestern.edu/megatron.pdf
  4. actually use a 12V car battery. you will find the shorts very quickly
  5. i have a few left
  6. typically you cannot get it to zero on both sides. But if you can, it should be stable
  7. not only is that plug a piece of shit, its the wrong dimensions and will crack a real stax female socket.
  8. singlepower would have used super glue. just like he did on all of those blackgate caps
  9. i went back to the pictures to make sure all of the parts on heatsinks in the original are on the common heatsink bar in the diy-T2 there are 2sc3675's with no heatsinks in the original, and they are that way on the diy-T2
  10. So i can certainly make some of those, and out of the metal that turns superconducting at LN2 temperatures. Put over a rare earth magnet, and they will spin for a very long time.
  11. you do realize that giving me idea's like this is only going to cause trouble
  12. very sweet now you need a 2 color power switch warming is one color, on is a different color (from joamat's T2 boards)
  13. pass labs clone chassis. nice until you have to put the jack and knob on the front panel
  14. not supposed to tap the heatsink. drill it the right size. transistors and screws and washer from the top, transistor, thermal washer,heatsink,circuit board,washer,nut
  15. 3 hours total 6 shots of various vodka's (new kickass Russian/French restaurant with 50 different vodka's) http://dekarestaurant.com/ and after generating the netlist, its still correct. scary The nice thing is this way you can drive all 32 relays at the same exact time. but unless you can calculate relay position, a lookup table is necessary board file posted, needs checking
  16. but but... its upside down. anyway http://gilmore.chem.northwestern.edu/atten2stereobal.jpg 2.05 x 3 inches but only 2 layers and still have to add or change the drivers
  17. yep 2 colums and both sides. you might as well put it all on one board because of the size of the drivers determines the minimum width if you solder all the resistors first, then possibly the inside row of pins on the relays could be hard to get at.
  18. I actually think I can get a balanced step attenuator with those relays in the same size as the original, all 16 relays. But a human is unlikely to ever be able to assemble it.
  19. transistors need to have a Vceo of 50v or more bias is 150 ma and the current mirror as the VAS means that the peak to peak voltage swing is 40V on +/-24v supplies absolutely flat to more than 5mhz
  20. there were some pictures posted over there on the inside of the amp 7 tubes and a whole pile of output transistors
  21. no matter what i order, or when, mouser is always backordered on something
  22. http://gilmore.chem.northwestern.edu/cfa2.jpg
  23. diodes are there to protect the inputs from voltages > +/-12 on those amplifiers with high power output
  24. the amb method. trouble is they dont switch as fast that way. should be ok though.

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