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Old 14th November 2004, 06:59 AM   #1
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Default Gary Pimm's battery biased mosfet cccs

Hi guys,
I need help form someone that has build the sch. attached or from mr. Gary himself......
I would like to try it on my 12B4 preamp. But since I don't know much about this circuit I have a few questions.

First, mr. Gary uses 3.3V battery cells in the table in his article (from where I have the sch attached). I have 3.6V cells - and because of that I would need to adjust slightly the circuit. Would it be enough to use the same circuit as attached and adjust it with the pot as in the sch or should I change some values.?

Second, he has metioned that he uses 2,3 or 4 cells- I asume that he use them in series with. So if I would decide to use 2 cells I would need 4 battery cells for the whole circuit, right?

Third, and most important of all, what is the voltage drop across the ccs? Is it the same as in other revisions (150V)?
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Old 14th November 2004, 07:00 AM   #2
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Here is the table - also from the same article....

BTW, thanks for all Your replies if there would be any.
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Old 15th November 2004, 06:07 PM   #3
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Hi,
is there anybody that could answer my q's?
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Old 15th November 2004, 07:05 PM   #4
grataku is offline grataku  United States
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GP would probably be able to answer all your questions. Have you tried him?
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Old 15th November 2004, 08:08 PM   #5
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Hi grataku,
no I didn't since I know that mr. GP is very, very busy man. I thought that someone on forum might have played around with this type of ccs. So it seemed better to ask those questions here, on forum.....
best regards

daniel
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Old 15th November 2004, 08:13 PM   #6
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You're more apt to find Gary if you ask over at the tube DIY asylum .
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Old 15th November 2004, 08:22 PM   #7
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Pedroskova, thanks - will also try there
regards
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