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Old 26th November 2006, 09:06 AM   #1
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Default High voltage psu

Hello

I use some of my time at tube amplifiers and that is the reason I need a regulated power supply (transistors ).

Variable output voltage 100 - 350 (400) voltage
Current 100 mA. Short circuit protected

Schematic wanted.

Regards

Benny
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Old 26th November 2006, 09:33 AM   #2
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Default Look for a Heathkit IP-32

I do not have the schematics for these unit but the specs are very close to what you need.

Three simultaneous Outputs:

Main (B+): 0 to 400 volts DC, 100 mA continuous, 125 mA max intermittent

Bias (C-): 0 to -100 volts DC, 1 mA max

Filament (A): 6.3 volts AC, 4 amps max

B+ Regulation: output variation less than 1% from no load to full load, for outputs of 100 to 400 volts; output variation less than +/-1% for a +/-10 volt variation in the 117 volt AC input

B+ Ripple: less than 10 mV RMS ripple, jitter and noise

Find a schematic and you can build it yourself.

-- josť k.
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Old 26th November 2006, 10:16 AM   #3
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Hi !

Some german sites with very well working PSU's:

One with the LR8N3 Regulator.
http://www.roehrenkramladen.de/hboexp3/hboexp3.htm

And one with comparators:
http://www.jogis-roehrenbude.de/Lese.../250VNT_01.htm

Both work very well

Manta
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Old 26th November 2006, 04:31 PM   #4
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Sounds like you need a Heathkit IP-32 power supply, its specs are very similar.

ftp://bama.sbc.edu/downloads/heath/ip32/IP32_2.GIF
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Old 26th November 2006, 05:41 PM   #5
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if you substitute a variable resistor for one of the fixed ones this works quite nicely -- uses the SuperTex LR8N3 HV regulator:

Click the image to open in full size.
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Old 26th November 2006, 05:43 PM   #6
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here's a schematic:

Click the image to open in full size.
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Old 26th November 2006, 06:02 PM   #7
sklimek is offline sklimek  United States
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Page 23 of Bas Horneman's latest DIYMAG shows a Texas Instr. TL783 schematic with a 400V regulated output.

http://www.diyaudio.com/forums/showt...25#post1060325

Stan
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Old 26th November 2006, 07:07 PM   #8
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the TL783 is designed with a smaller range of input voltages than the LR8N3 -- you could effect the same result with an LM317 --just protect such that the input to output voltage is limited by the zener.

the supertex devices was designed as a supervisory circuit regulator for off-line SMPS -- just repurposed.
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