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.

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.

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

those are fine current limit is .75 volts across the 10 or 5.1 ohm resistor, or whatever value you stick in there

yep, exactly like it works on the original supply

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.

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.

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.

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

http://gilmore.chem.northwestern.edu/boards/kgsshvpssicfetsinglenewleft.zip http://gilmore.chem.northwestern.edu/boards/kgsshvpssicfetsinglenewright.zip

added labels to the silkscreen and updated the zip file the original board is 6.28 x 3.37 inches and won't fit in a standard chassis with the power supply the new board is 5.45 x 4.2 inches the new layout is much tighter, shorter lengths and the two output sections are absolutely identical. I have an alternate version of the power supply split into two pieces each 3 x 6.5 inches so you could mount the power supplies vertically, one per heatsink, and one amp channel per heatsink

fixed everything I know of, same names have a look also the stax mafia are starting to use these http://www.digikey.com/product-detail/en/THINC22-TO220-16-11.4-5.8-0.3/1168-1953-ND/3878142 on the dn2540 and the power diodes would like to find that part at mouser, but can't yet (works well on the kgst cascode board)

it would be the same number of cables. both boards would fit on one angle bracket with .5 spacing final board size 5.45 x 4.2 inches so the boards fit side by side. here is what it would look like in the Dissipante 02/300N 2U 4mm BLACK (360mm wide x 300mm deep internal) http://gilmore.chem.northwestern.edu/kgsshvcarbonchassis.jpg for the amp boards, you can lift off the bottom of the chassis by .8 inches then put the power input block on the bottom of the board. would make for a very pretty wiring job.

fixed that could make it one board that would be 11.125 x 4.35 just to make it easier

updated the picture, please check against schematic for accuracy. the board is now 5.65 x 4.35 inches the idea is to stuff this into the pesante 2U box. just fits. With the new power supply 6 x 6.5 inches, 2 amp channels on one heatsink, and the power supply on the other. leaves more than 5 inches x 6 inches for the transformer. now to find some r-core transformers. single box, all standard parts

new from the ground up symmetrical carbon in progress http://gilmore.chem.northwestern.edu/kgsshvcarbonv2.jpg 6 x 4.35 inches

the 469 volts is a bit high, time to trim one resistor a bit

there is already a pot trimmer. but some were out of range

birgir's brain is on free-run after building 6 x carbons... pick the closest thing you can get to 440k and then recalculate the other resistor or pick numbers for 2 resistors that add to 880k it does not have to be super exact, the voltage will be slightly off, no big deal

easier to test than unsolder. this applies to all the boards at all the desired current levels.

got a batch of dn2540 and they have a 20% variance, so much easier to pick the resistor on a test circuit and stuff it in when you build the board.

http://gilmore.chem.northwestern.edu/boards/kgsshvcarbonv2.zip this is the version 1 board above with the cascode current sources and 4 of the transistors replaced with pzta series parts. not tested, but I would have to be an idiot to mess this one up. (someone should check)

the tested board is kgsshvcarbonv1.zip this is the original board with the original limited servo and the adjustment pot. joamat has tested the left and right versions of the boards. the Kerry servo an the joamat servo boards have not been tested. birgir thinks the extra servo is not necessary because the amp is extremely stable without all the extra parts.

the original kgst boards are fine the ones with the cascode current source have the one heatsink ungrounded. how this happened, who knows. Its why i need a much bigger monitor.

it fits just barely http://gilmore.chem.northwestern.edu/dynahibal17.jpg