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Old 14th January 2007, 09:26 PM   #1
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Default broskie voltage regulator

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

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Old 14th January 2007, 10:48 PM   #2
rdf is offline rdf  Canada
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Default Re: broskie voltage regulator

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.
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Old 14th January 2007, 10:50 PM   #3
lndm is offline lndm  Australia
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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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