June 28, 201016 yr comment_367723 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 Report
June 28, 201016 yr comment_367727 Wiper should be connected to -500. Same for both channels(same for last post above also) Report
June 29, 201016 yr Author comment_367760 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, 201016 yr by kevin gilmore Report
June 29, 201016 yr comment_367768 You are right. What about RV2/R44/R45? Is Rev 0 the correct board? EDIT: correct amp board Edited June 29, 201016 yr by digger945 Report
June 29, 201016 yr comment_367820 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. ....? Report
June 29, 201016 yr comment_367824 mypasswordis posted:- Don't you mean 82 Sorry, must have dyslexic fingers and calculator..... Report
June 29, 201016 yr Author comment_367843 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. Report
June 29, 201016 yr comment_367861 I'd spec the transformer at 100mA for some extra headroom but I like to overbuild... Report
June 29, 201016 yr comment_367982 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) Report
June 29, 201016 yr Author comment_368001 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. Report
June 29, 201016 yr comment_368006 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.... Report
June 30, 201016 yr Author comment_368072 Missing TKD GND lands. On the schematics. R50 10K > 300ohm done and done... Report
July 4, 201016 yr Author comment_369395 anyone know where to get the rubber versions of these things https://sdp-si.com/eStore/PartDetail.asp?Opener=Group&PartID=1938&GroupID=545 Report
July 7, 201016 yr Author comment_369962 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. Report
July 7, 201016 yr comment_369967 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. Report
July 7, 201016 yr Author comment_370084 yep, that is what i'm looking for. the other ones make noises as they turn. Report
July 7, 201016 yr comment_370141 If you can't find the appropriate rubber ones try sleeving over the joint with silicone tubing. Report
July 22, 201016 yr Author comment_373723 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. Report
July 22, 201016 yr comment_373779 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... Report
July 22, 201016 yr comment_373784 I think there was a group buy for them recently on diya. It might still be on going. Report
July 22, 201016 yr Author comment_373805 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. Report
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