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Old 27th December 2005, 11:48 AM   #21
Jay is offline Jay  Indonesia
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Quote:
Originally posted by quasi
The circuit at first glance could look like it uses the transistors as a booster stage carrying the bulk of the current
That's what I have in mind.

Quote:
Originally posted by quasi
Finally the circuit will work with any 3 pin regulator any 78xx & 79xx. The ouput voltage will be the sum of the zener(s) plus the regulator voltage.
Ha! That's a very good news I just might need to buy some other zeners...
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Old 27th December 2005, 12:26 PM   #22
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Supertex developed a nice little (TO-92) regulator which will "do" 1.2 to 450 V -- the LR8N3 -- it's stated purpose seems to be controlling the high voltage on the front-end of an off-line switching power supply. Of course it is also applicable as a regulator to control the base of a pass transistor.
http://www.supertex.com/pdf/datasheets/LR8.pdf

www.mouser.com is their distributor in the U.S.
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Old 21st January 2006, 11:33 PM   #23
awpagan is offline awpagan  Australia
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just saw this thread.

quasi
silicon chip used this idea for there ULD amp power supply +- 55v

Used 317/37's and trimpots for adjusting.

psu works well very versatile.

jackinnj

the LR8N3 looks interesting.
i need a 300v and 600v voltage lines for a valve amp.
been using zeners, because haven't found high voltage reg.
until now, thanks, food for thought.

300v rail easy to work out but 600v?
? could reference off the 300v or bypass like this thread.

any suggestions???
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Old 21st January 2006, 11:51 PM   #24
quasi is offline quasi  Australia
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I can't see why this would not work at 600v, using higher voltage transistors and capacitors and a current limiting input resistor(s) for a softer start. I'm not sure what voltage zeners you can get, I've got some 150v here so 4 of them would do it.
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Old 22nd January 2006, 12:01 AM   #25
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What kind of preamp needs 600v?
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Old 22nd January 2006, 01:10 AM   #26
awpagan is offline awpagan  Australia
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quasi
3*150v 1*130v zeners with 20% tolerance made to total of 594v, close enough
farnel has zeners up to 270v


did have it working, then when putting in case, redesigned psu pcb,
not stable since
probably done somthing wrong
got sidetracked till i saw these regs.

astouffer
preamp?

built this fair while ago
http://headwize.com/projects/showfil...ilmore_prj.htm


allan
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Old 22nd January 2006, 01:14 AM   #27
quasi is offline quasi  Australia
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Hey awpagan,

are you saying that you had my PCB working up to 594 volts, the schematic or something else?

Cheers
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Old 22nd January 2006, 01:25 AM   #28
awpagan is offline awpagan  Australia
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oops sorry
just reread my post

Not your circuit but the one in the link using zeners and bu508's
this one
http://headwize.com/images/gilmore4.gif

allan

ps silicon chips circuit i can mail if you want?
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Old 22nd January 2006, 01:45 AM   #29
quasi is offline quasi  Australia
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Quote:
Originally posted by awpagan
ps silicon chips circuit i can mail if you want?
Yes please.

Cheers
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Old 22nd January 2006, 01:58 AM   #30
awpagan is offline awpagan  Australia
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you have mail

cannot attach though diyaudio
please reply to email and i'll attach it
SC edition nov 2001
allan
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