June 28, 201015 yr At least someone is looking at it... Please check again for more errors. PS board. Not connected to the GND . > R14(2.2K) & R15(100), C7 & C8 (4,700uF) , R9(300K), U3(7815), U4(7915) Small
June 28, 201015 yr Wiper should be connected to -500. Same for both channels(same for last post above also)
June 29, 201015 yr Author Well the ps board was not updated for some reason, all those should be fixed now. The wiper on the pot is the center pin, and as a two wire device it really does not matter which end its tied to ?? The connectons to ground are hard to see in the jpg's. here are the pdf's http://gilmore.chem.northwestern.edu/kgsshvamp3.pdf http://gilmore.chem.northwestern.edu/kgsshvps.pdf Edited June 29, 201015 yr by kevin gilmore
June 29, 201015 yr You are right. What about RV2/R44/R45? Is Rev 0 the correct board? EDIT: correct amp board Edited June 29, 201015 yr by digger945
June 29, 201015 yr K. Gilmore stated:- 475 volt windings... 2 of them, completely seperated. 39 watts each 30 volts center tapped 10va 475V @ 39 watts is only 8.2mA. ....?
June 29, 201015 yr mypasswordis posted:- Don't you mean 82 Sorry, must have dyslexic fingers and calculator.....
June 29, 201015 yr Author You are right. What about RV2/R44/R45? Fixed. new jpg and pdf for the amp board. keep the errors comming please, need it to be perfect the first time.
June 29, 201015 yr I'd spec the transformer at 100mA for some extra headroom but I like to overbuild...
June 29, 201015 yr C1 and C2(5pF) missing I forgot, the 170/389 silks and stuff look good(I can't read the DGS but regardless it's correct by the silk)
June 29, 201015 yr Author C1 and C2 were always optional anyway, way back from the start. Never needed them before, hope not to need them now on the board, but might as well have a place for them if needed.
June 29, 201015 yr Spritzer posted:- I'd spec the transformer at 100mA for some extra headroom but I like to overbuild... . Way to go, Spritzer. I like it.... More power for the peeples....
June 30, 201015 yr Author Missing TKD GND lands. On the schematics. R50 10K > 300ohm done and done...
July 4, 201015 yr Author anyone know where to get the rubber versions of these things https://sdp-si.com/eStore/PartDetail.asp?Opener=Group&PartID=1938&GroupID=545
July 7, 201015 yr Author So the transformer is going to be 4 inches in diameter. Which means that the inside of the box is going to have to be 13 x 13 inches for a single chassis thing. Heatsinks both sides.
July 7, 201015 yr anyone know where to get the rubber versions of these things https://sdp-si.com/eStore/PartDetail.asp?Opener=Group&PartID=1938&GroupID=545 Something like this.... or this... From an RC hobby site. Can't find a place to buy them yet, just wondering if it would fit the bill first.
July 7, 201015 yr If you can't find the appropriate rubber ones try sleeving over the joint with silicone tubing.
July 22, 201015 yr Author i'm thinking seriously of doing a version of the board with a simplified current source that performs just as good (1000 volt ixys part, thanks marc) and with standup heatsinks. Will make it lots easier and cheaper for people to build it. Power supply will be the same thing. Hopefully will get started on it friday. Will cut the power supply voltages to +/-450 just to make sure the current source has a bit of headroom. if anyone knows of a depletion mode fet that does more than 1000 volts and will run at 1ma, let me know.
July 22, 201015 yr i'm thinking seriously of doing a version of the board with a simplified current source that performs just as good (1000 volt ixys part, thanks marc) and with standup heatsinks. Will make it lots easier and cheaper for people to build it. Power supply will be the same thing. Hopefully will get started on it friday. Will cut the power supply voltages to +/-450 just to make sure the current source has a bit of headroom. if anyone knows of a depletion mode fet that does more than 1000 volts and will run at 1ma, let me know. High voltage depletion mode JFET http://www.semisouth.com/products/uploads/DS_SJDP120R085_rev1.0.pdf#search=%27SJDP120R085%27 but it is too big...
July 22, 201015 yr I think there was a group buy for them recently on diya. It might still be on going.
July 22, 201015 yr Author its also a jfet. in any case i will try and buy a few and test them. i assume people are using them as current sources, would like to know how they actually perform.
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