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Old 4th June 2004, 02:17 AM   #21
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Quote:
Spec sheets look interesting, Eli. Do you know where these diodes can be purchased?
Tube Builder (www.tubebuilder.com) carries the SiC Schottkys.

The 1200 PIV parts are costly, but the 1 A./600 PIV parts are under 2 USD each. You can build a bridge rectifier with UF4007s in the ground legs and SiC Schottkys in the B+ legs that will be very quiet, as the Schottkys block the PN reverse recovery spike. IMO, containing costs while retaining performance can't be bad.
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Old 4th June 2004, 07:50 AM   #22
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Default SE813 AMPLIFIER SHEMATIC

HERE THE SHEMATIC OF 813 TUBE AMPLIFIER.
http://homepages.ihug.co.nz/~rwillis/alex/
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Old 4th June 2004, 01:38 PM   #23
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Default if you have to regulate

this is a close approximation of the Horowitz and Hill HV regulated supply with a voltage doubler. i have used this supply for a HV lab supply -- instead of a reference I use a DAC, etc., etc.

you might have to adjust the compensation values for your particular situation.

the bottom of C3 should be grounded.
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Old 4th June 2004, 05:22 PM   #24
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Default power supply

OK. What is Q2 ?
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Old 4th June 2004, 07:19 PM   #25
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Default Re: power supply

Quote:
Originally posted by noyan
OK. What is Q2 ?

Take a look at the parametric search engines at International Rectifier or Fairchild Semiconductor -- Fairchild, in particular, should have out their 1200 Volt Super MOSFET. (They talked about it on one of their web-seminars recently.)

The supply I have built only goes to ~400 volts, I am using IRFPG40's.
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Old 5th June 2004, 02:03 AM   #26
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Look at the voltage doubler power suppy at`s used in my 805 SET at Dave (planet10) so kindly posted for me, it works well as is simple.

Help needed changing from srpp5814a to srpp12bh7a

Cheers George
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Old 5th June 2004, 04:47 AM   #27
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Default IXTP3N120 1200V/3A SUPER MOSFET

If i use: IXTP3N120 1200volts / 3A high voltage super mofset in my shematic and remove IRF740 and BUX48. Then, 900 volts will not be a big deal for such strong mosfet. ???
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Old 5th June 2004, 12:57 PM   #28
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Default Re: IXTP3N120 1200V/3A SUPER MOSFET

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Originally posted by noyan
If i use: IXTP3N120 1200volts / 3A high voltage super mofset in my shematic and remove IRF740 and BUX48. Then, 900 volts will not be a big deal for such strong mosfet. ???
The circuit I have shown would also require that the values of the caps in the doubler be capable of handling more than 450V for 900V out -- thus you would use a pair in series -- i.e. 680uF/350VDC.

The Ixys transistors are available from Digikey (if anyone is wondering) they are $6.09 ea.
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Old 5th June 2004, 01:14 PM   #29
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i was just wondering... i had a look at george's power suply, and saw the two diodes in series on it, and it made me think how many times i have seen this used... so maybe i'm getting a little off topic, but what is the advantage of putting two diodes in series? is this to do with the switching noise or something??? anyone on this post know?

cheers
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Old 5th June 2004, 01:28 PM   #30
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Default serial diodes

I am wondering too.
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