kevin gilmore Posted July 4, 2015 Report Posted July 4, 2015 (edited) I have seen bigger caps than the 470uf caps mounted horizontally, so I'm sure its ok. a singles version of the 900v supply would be 5.95 x 4.5 inches http://gilmore.chem.northwestern.edu/circlotronhvpowersingle.jpg so each side of the heatsink with everything mounted vertically from the front would be driver board output board 900v power supply 900v power supply hv power supply so minimum height of the heatsink needs to be 5.95 inches and the boards stick out a maximum of 4.5 inches definitely fits in the 5U box ?? transformers on the back panel?? 2 inch spacing between the driver and output board then 3 inch spacing on the power supply boards (or whatever the cap height is) Edited July 4, 2015 by kevin gilmore
s_r Posted July 4, 2015 Report Posted July 4, 2015 How about mounting the driver/output boards vertically & the PSU boards horizontally? Should put less stress on the caps & leave enough space for toroids on the bottom plate (this is assuming 500mm depth). I can include a rudimentary sketch if needed.
kevin gilmore Posted July 4, 2015 Report Posted July 4, 2015 if it fits, it fits. not a bad idea to do the hv power supplies horizontal and stacked depth might be an issue
DefQon Posted July 5, 2015 Report Posted July 5, 2015 (edited) Good to see this one moving forward........ RE: Cases and enclosures? Who needs em, have em built Don Garber style, open frame and easy to touch. Edited July 5, 2015 by DefQon
spritzer Posted July 5, 2015 Report Posted July 5, 2015 This is an amp you'd really want a 6' stick just to turn it on....
nopants Posted July 5, 2015 Author Report Posted July 5, 2015 that was also part of my reasoning for using a preamp... something with a remote so I can listen comfortably behind the blast shield
kevin gilmore Posted July 5, 2015 Report Posted July 5, 2015 (edited) its really no different than the kgsshv, its the same +/-450v output swing. and the 900v supplies are the same as the original supply, they just float. no big deal, nothing to see here, move along. made the single power supply a bit smaller. 5.95 x 4.35 inches by the way, the pdf of the kemet capacitors specifically says they can be mounted in any position. Edited July 5, 2015 by kevin gilmore
kevin gilmore Posted July 7, 2015 Report Posted July 7, 2015 this is the new power supply schematic. i like it much better than the previous version. new board soon http://gilmore.chem.northwestern.edu/goldenreferencehv900new.pdf runs on much less voltage, so for the dht amp running at 50ma, less heat also less noise than the old version, and no pile of zeners
nopants Posted July 7, 2015 Author Report Posted July 7, 2015 impossible to keep up with your progress, not that that's a bad thing When's the DHT amplifier coming out? Will there be a kickstarter?
sorenb Posted July 7, 2015 Report Posted July 7, 2015 "350V/us", does that mean you plan to bump the current in the output stage to 42mA (assuming 120pF load)? Would it be safe to use the original PSU board for the floating supplies if one lowers the voltage from 900V to 700V then the original 450V caps can be used I assume
kevin gilmore Posted July 7, 2015 Report Posted July 7, 2015 should you actually find music that will drive the amp at the speeds necessary, the output stage will drop out of class A and go into AB.
JimL Posted July 7, 2015 Report Posted July 7, 2015 kevin gilmore said: "this is the new power supply schematic. i like it much better than the previous version." And I assume if you ground the input side and the output side at the junction of the two 470 uf caps you can use this PS for the KGST, KGSS, KGSSHV Carbon, BH, etc - with appropriate adjustment for the output voltage? BTW, shouldn't R8 be 890k nominal? Will need to find a 1 kV rated resistor for that one, or else three 350v resistors in series.
kevin gilmore Posted July 7, 2015 Report Posted July 7, 2015 (edited) yeah, there is about 5 volts of offset, no biggie board posted there are 3 resistors in series for the feedback and its 890k total on the board. no, you definitely should not try to use this as a dual voltage supply because only one side is regulated. like this http://gilmore.chem.northwestern.edu/circlotronhvpowersinglenew.jpg Edited July 7, 2015 by kevin gilmore
sorenb Posted July 7, 2015 Report Posted July 7, 2015 apart from a lower voltage swing I assume the circlotron can be doneusing battries at 700V rather than 900V?
kevin gilmore Posted July 7, 2015 Report Posted July 7, 2015 and then you have to change the driver power supply to +/-350
sorenb Posted July 7, 2015 Report Posted July 7, 2015 Thnx, can you share the part number for the 1kV terminals you are using? (cannot seem to find any at Mouser)
kevin gilmore Posted July 7, 2015 Report Posted July 7, 2015 http://www.mouser.com/ProductDetail/Phoenix-Contact/1902547/?qs=sGAEpiMZZMvZTcaMAxB2AKJ8wpDgQJg5WwkpmYrVFB4%3d
sorenb Posted July 7, 2015 Report Posted July 7, 2015 has anyone used/traced this http://gilmore.chem.northwestern.edu/kgsshvcarboncirclotron.jpg....? seems like the upper left opto hasn't been connected at pin4/5 (assuming no ground plane) ?
sorenb Posted July 7, 2015 Report Posted July 7, 2015 thnx...looks ok to me, thnx for the link to Mouser
leonjo Posted July 20, 2015 Report Posted July 20, 2015 Oh, what a great project! So It will be 8 boards+ 3 transformers to build the circlotron?
kevin gilmore Posted July 20, 2015 Report Posted July 20, 2015 10 boards plus 3 transformers plus 5U case per side 1 x hv ground reference 2 x hv900 1 x driver 1 x output
JimL Posted July 20, 2015 Report Posted July 20, 2015 (edited) For some reason thoughts of flies and sledgehammers comes to mind. Edited July 20, 2015 by JimL
headinclouds Posted August 1, 2015 Report Posted August 1, 2015 (edited) i also don't know where to get sheets of that silicone shown above Bergquist do SIL PAD which Farnell/Element 14 have and also similar transistor retaining springs http://uk.farnell.com/fischer-elektronik/thfu-3/clip/dp/1892352?ost=transistor+spring+retainers Good luck with this project! Edited August 1, 2015 by headinclouds
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