broskie voltage regulator

dave dove · 14th January 2007, 08:26 PM

http://tubecad.com/2006/11/blog0087.htm

i've been looking at the 12b4 regulator above
i understood i would need to shunt @120% of circuit current
is this so?
i can't find any mention of this on broskies site
my phono stage draws 80mA
i'm thinking this 12b4 will not be enough

dave

rdf · 14th January 2007, 09:48 PM

Quote:

Originally posted by dave dove
i understood i would need to shunt @120% of circuit current....

Where did the figure originate? I suspect the 12b4 is required to sink a DC minimum of 120% of the circuit's maximum AC draw, which for most line stages would be miniscule. I'ld also be tempted to investigate returning the cathode through the zener diode stack at an appropriate voltage and running it pseudo fixed-bias.

lndm · 14th January 2007, 09:50 PM

You really only need to shunt enough so the shunt device can make up the difference from the amp. Ie, if the amp under working conditions varies its current by, say, 1mA in each direction then the shunt device only needs to draw 1mA plus a little more to be sure it stays within a good area of operation (doesn't bottom out).

14th January 2007, 08:26 PM	#1
dave dove diyAudio Member Join Date: Mar 2005 Location: mid wales	broskie voltage regulator http://tubecad.com/2006/11/blog0087.htm i've been looking at the 12b4 regulator above i understood i would need to shunt @120% of circuit current is this so? i can't find any mention of this on broskies site my phono stage draws 80mA i'm thinking this 12b4 will not be enough dave

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14th January 2007, 09:50 PM	#3
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	You really only need to shunt enough so the shunt device can make up the difference from the amp. Ie, if the amp under working conditions varies its current by, say, 1mA in each direction then the shunt device only needs to draw 1mA plus a little more to be sure it stays within a good area of operation (doesn't bottom out).

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