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Old 27th January 2013, 12:30 AM   #31
dimitri is offline dimitri  United States
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Scott Wurcer published this circuit a while ago
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Old 27th January 2013, 03:21 AM   #32
CBS240 is offline CBS240  United States
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Here is a very simple SS buffer I use. It allows me to use 1uf polypropylene input cap. 1uf PPM cap is reasonably sized to fit onto a PCB and not act as an antenna. "I-bias" is simply a Jfet bias Idss (Vgs=0V), a few mA or so. 4091 is like a J111 and has realitivily high conductance and Vgs is about 6-8V at a few mA.
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Old 27th January 2013, 05:19 AM   #33
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Thanks for the posting! This is what I 've waited to know! :-) The concept used, although not the form, is exactly the same i've used in my buffer! :-).

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Old 27th January 2013, 05:25 AM   #34
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Quote:
Originally Posted by CBS240 View Post
Here is a very simple SS buffer I use. It allows me to use 1uf polypropylene input cap. 1uf PPM cap is reasonably sized to fit onto a PCB and not act as an antenna. "I-bias" is simply a Jfet bias Idss (Vgs=0V), a few mA or so. 4091 is like a J111 and has realitivily high conductance and Vgs is about 6-8V at a few mA.
Good circuit but require the use (and even a coarse selection) of two JFET, a device which is progressively fading from the market, at least in other form than the SMD format, Even more require an addictional servo with its own circuitry.

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Old 27th January 2013, 05:33 AM   #35
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Quote:
Originally Posted by dimitri View Post
Scott Wurcer published this circuit a while ago
Not well refined (a bit cervellotic instead and even circuitally inconsisent: pheraps because is likely to be just a sketch to be evolved further as those reported by you before.

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