Values of +/- 24 volt Borbely PSU.... - diyAudio
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Old 1st October 2003, 09:37 AM   #1
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Default Values of +/- 24 volt Borbely PSU....

I have just found this schematic for the Borbely EB-802/243 powersupply.

It's a wideband, lownoise powersupply designed for audio circuits.

Has anyone built thes unit? And can anyone tell me what the values of the components should be?

I only know, that r3=2.49K and R1=1K for the output to be +/- 24 Volts. Other outputs can be obtained by the formulae:

6.9x(R3+R1)/R1

The reference diodes is LM336Z-5.0.

Opamps could be NE5534.

Any help to get?

Best,

Peter
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Old 1st October 2003, 06:59 PM   #2
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Default If you have to ask............

RTF*D

http://www.audiokits.com/downloads.asp

Or you could buy a kit from these folks or Borbely Audio I would imagine. Tell them Walt J. referred you. **

Just don't tell PA about it.



BTW There are this cool new things called search engines, but perhaps you might not have heard about them.

* That's Formal you suspicious moderators

** Sorry Jan the devil made me do it....
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Old 1st October 2003, 11:56 PM   #3
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Talking Borbely PSU...

Very funny....

www.audiokit.com is where I got the schematic from. They may have a reason not to put values on it...;-)

I have another Borbely PSU design I can use instead.

Look here - free to use high quality PSU:
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Old 2nd October 2003, 11:49 AM   #4
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Both designs are based on Sulzer's supply, as far as I know.

The most modern version (Walt Jung's) is different because of the chips he used and because he added a feedback from the part you were powering. That is you should only use one supply for each chip you were powering.

From the photos I have seen, I think the small supply pcb Audiokits sells is based on Jung's design, but this is only a guess.


Carlos
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Old 2nd October 2003, 02:33 PM   #5
pooge is offline pooge  United States
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Default Get a better regulator

You are better off going to Andy's site and getting a reg from him. They are more advanced than Borbebly's, have high quality PCBs with plated through holes, and cost less.

I don't understand why Borbely uses a FET as a pass transistor, anyway. Walt Jung had the same question when I asked him about it.

ALW Audio
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Old 2nd October 2003, 02:49 PM   #6
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What's the URL of Andy's site?

The one you typed (AWL AUDIO) is a broken link....
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Old 2nd October 2003, 10:17 PM   #7
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Must've been a temporary down time. Works OK now...

Rune
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Old 3rd October 2003, 12:59 AM   #8
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Question We could tell you but we would have to kill you to keep it secret

"I don't understand why Borbely uses a FET as a pass transistor, anyway. Walt Jung had the same question when I asked him about it."

Erno knows...........

I know......

Andy knows.........

I bet even Walt now knows........

The open loop output impedance of the Mosfet is much higher than a bipolar at the same quiescent current which is a drawback rsulting in higher output impedance, but the Mosfet has the real advantage of ..........

I wonder who else knows?
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Old 3rd October 2003, 01:19 AM   #9
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Unhappy Re: Borbely PSU...

Quote:
Originally posted by jazzpeter65
Very funny....

www.audiokit.com is where I got the schematic from. They may have a reason not to put values on it...;-)

I have another Borbely PSU design I can use instead.

Look here - free to use high quality PSU:

I'm sorry, the version I downloaded EB-802-243-complete.PDF awhile back had a parts list. Is that not the case now? Have you tried Emailing Mr. Borbely?

http://www.borbelyaudio.com/
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