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kevin gilmore

i'm on a roll... the kgsshv

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Inu    29
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

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kevin gilmore    995

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 by kevin gilmore

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wink    242

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. ....?

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wink    242

mypasswordis posted:-

Don't you mean 82

Sorry, must have dyslexic fingers and calculator.....

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kevin gilmore    995
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.

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spritzer    1,444

I'd spec the transformer at 100mA for some extra headroom but I like to overbuild... :cool:

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kevin gilmore    995

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.

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wink    242

Spritzer posted:-

I'd spec the transformer at 100mA for some extra headroom but I like to overbuild... :cool:
.

Way to go, Spritzer. I like it....

More power for the peeples....

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kevin gilmore    995

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.

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kevin gilmore    995

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.

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Inu    29
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... :(

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kevin gilmore    995

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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