kevin gilmore

last set of boards is gone. power supply up next

surface mount board finished and tested and bug free. http://gilmore.chem.northwestern.edu/dsc_0659.jpg there is one set of boards left if anyone is interested

just imagine what that would cost if pete decided to sell it.

birgir has the pictures ask him. major surgery moreso if you add the current sources

another mikhail at work

srpp, yikes. but that can be fixed in a few seconds. perfect for the circlotron power supply so i'm assuming the top tubes have seperate filament windings for all 4 tubes?

no room, but 5.1 ohm resistors are available in 5 watt, so thats about 135ma updated picture, smaller for now, bigger later

i have a .6T magnet on my desk at work. Very dangerous. charges steel tools in less than a second. that one looks like fun. my biggest nmr is 14T

the idea with the new supply is to be able to supply more current for things like the megatron. so for the current limiter to work, that 10 ohm resistor would have to be something like 5 ohms. will look into it later.

fixed the board and the schematic. the 100 ohm gate resistor is a cheat. that and the winding ground on the +/-15 so that it is easier for joamat to make a single sided board without any feedthru's but really the board should be double sided and plated thru holes.

board picture updated, please check with this http://gilmore.chem.northwestern.edu/goldenreferencehvsic.pdf

so Kerry did the analysis on this, and his name is on the board, for the next version and I appreciate his help. This is a big deal because it has essentially 1 less stage, so it runs on as little as 50 volts unreg to reg, so it generates less heat. with 75 volts difference you can run 550V caps with 25V of margin at 450V output http://gilmore.chem.northwestern.edu/kgsshvpssicnew.jpg 6.0 x 6.5 inches if I can just find a way to get rid of the one red, you could make this as single sided like some of the rest of the new ones.

the holes are feedthru to the other side. the to92 are not the same pinout and those holes are very tiny and masked. could do the caps as surface mount, pick a package. the pots would end up the tallest item.

I have had nothing but grief with the elma (dact) things. after a while the contacts go high impedance. same as the khozmo.

missing 4 parts. I hate it when that happens, shipping costs more than the parts I should just buy 5000 pieces of every single resistor I use...

details, details, you get the idea. zener stack 500v for 450v output, 450v for 400v output and yes the idea is that you stack 2 of them. sure looks like the carbon really would fit in a single 2U heatsink box this way. still have to do a bias supply, and a simple +/-15 board

http://gilmore.chem.northwestern.edu/dsc_0658.jpg

oops going to fix that in other news, these Vikings seem to want SMALL, so this is for soren to fit into a 2U http://gilmore.chem.northwestern.edu/kgsshvpssicfetsingle.jpg in other other news, Kerry did a HV version of the goldenreference, will evaluate now.

lets see, 1) plate resistors, bad 2) ac coupling to the output tubes (average) 3) voltages too low for those output tubes,bad 4) opamp front end, very bad etc. and the price... go buid a srx2. way cheaper, way better but this one is kind of fun and majorly ugly http://page11.auctions.yahoo.co.jp/jp/auction/n145221931

those are the diode bridges check the bom for the right part

there used to be chassis mount versions of the long 20 turn pots. don't know if they are still available.

http://gilmore.chem.northwestern.edu/goldenreference3.jpg off board version

the one would be a 450v version kgsshv transformer the other 2 are 4 x 380vrms @ 100 ma each

figuring on the transformers at least 20% bigger than the t2 transformers so say 4 inches diameter and 2.5 inches thick the power supply boards are 7.45 x 6.48 and the height will be that of the power caps the amplifier board and output board should stay at 6.28 x 3.37 the kgsshv power supply is 6.92 x 5.16 and the same cap height chassis is pesante 5U monster amplifier box any other ideas, and i will certainly listen

so 2 of the 3 simulators i use gave the same results for the power supply with the schematic shown. But ltspice oscillates. Kerry made the following changes, until i build the real thing, will not know which is right. C3,C16 4.7nf C4,C5 470pf c9,c12,c8,c15 not used no changes to the circuit board necessary for this i think