+B Power Supply Basics
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 6th December 2006, 09:42 PM #1 Bengali   diyAudio Member   Join Date: Oct 2006 +B Power Supply Basics Hi, any suggestions for a good book on tube power supply designs or online sources? there are so many designs. I'm trying to find out the basics, like after the rectification, where do you go from there, add a choke in series, add a cap, add a resistor,etc. How are the appropriate values calculated for the target voltage and to achieve the low noise, low ripple? If I have a transformer with an output of 220V, after full wave, I have about 311V. My target voltage is 200v, less than 50mA. If I wanted to use solid state parts to regulate it, what would you use? thanks.
 6th December 2006, 10:21 PM #2 SY   On Hiatus     Join Date: Oct 2002 Location: Chicagoland "Valve Amplifiers" 3rd edition, Morgan Jones. He treats these questions in great detail. __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
zobsky
diyAudio Member

Join Date: Mar 2002
Location: Dallas, Tx, USA
Re: +B Power Supply Basics

Quote:
 Originally posted by Bengali Hi, If I have a transformer with an output of 220V, after full wave, I have about 311V. My target voltage is 200v, less than 50mA. If I wanted to use solid state parts to regulate it, what would you use? thanks.
I'm guessing that 311 is the unloaded voltage, .. The load will affect the output voltage.

Also, reducing the first C in a CLC..... filter will bring down the voltage, and vice versa.

PSUD is a good software to play around with these values, in addition to reading up.

Hope that helps
__________________
"Not everything that can be counted counts, and not everything that counts can be counted." - Albert Einstein

 6th December 2006, 10:32 PM #4 alexmoose   diyAudio Member     Join Date: Mar 2006 Location: Michigan there a few important things to remember 1. V=IR if the transformer is NOT loaded, then I is virtually 0 and there will be no voltage drop at all no matter how much R is in the Line. This becomes a real pain in the behind when you are trying to drop voltage without knowing the operating point of your tube. 2. Once again, if the Transformer is not Loaded, all of the voltages read marginally higher even with no resistance in the Line. 3. many people suggest that you usePSUD2 However in my experience it seems rather worthless unless you already have a circuit built, and you are tweaking it. 4. Have fun! I'll be happy to answer any more questions to the best of my ability -Moose
Alain Dupont
diyAudio Member

Join Date: Sep 2003
Location: Paris - France
Bengali,

A nice new design from John Broskie:

I did build 2 of these for 250DC volts and 50mA load for my phono stage

Working real great!!

These can be called "regulations..."

I did use a LF356N as IC and 7mA in the IXCP 10M45 {could use a DN2470}

Ripple invisible at the scope... and no variation of output voltage between
0 and 300mA... done tests until 1.2A

regards.

Alain.
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 6th December 2006, 10:42 PM #6 Nordic   diyAudio Member     Join Date: Sep 2005 Why do they call it B+?
 6th December 2006, 10:42 PM #7 dsavitsk   diyAudio Member     Join Date: Jan 2005 Location: Hartford A couple of nice articles here including a few on beginning PS design: http://www.audioxpress.com/resource/...lass/index.htm __________________ http://www.ecpaudio.com :: http://diy.ecpaudio.com
 6th December 2006, 10:43 PM #8 anatech   diyAudio Moderator     Join Date: Jun 2004 Location: Georgetown, On Hi Nordic, B battery, positive terminal. -Chris
alexmoose
diyAudio Member

Join Date: Mar 2006
Location: Michigan
Quote:
 Originally posted by Nordic Why do they call it B+?

correct me if I am wrong, but doesn't B refer to a battery that used to run the plates in old portable Radios? B+ being the positive Terminal

alexmoose
diyAudio Member

Join Date: Mar 2006
Location: Michigan
Quote:
 Originally posted by Alain Dupont Bengali, A nice new design from John Broskie: http://www.tubecad.com/2006/11/blog0087.htm I did build 2 of these for 250DC volts and 50mA load for my phono stage Working real great!! These can be called "regulations..." I did use a LF356N as IC and 7mA in the IXCP 10M45 {could use a DN2470} Ripple invisible at the scope... and no variation of output voltage between 0 and 300mA... done tests until 1.2A regards. Alain.

I like the Design, any chance I could sneak a peak at the schem?

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