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From: "Phil Allison"
Subject: Re: comments on using a MOSFET instead of JFET for audio compressor
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 18 Jan 2003 17:38:22 +1100
NNTP-Posting-Date: Sat, 18 Jan 2003 17:27:31 EST
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"Tony Roe" wrote in message
> I need to build many ultra-low cost audio compressor/limiters, so I looked
> various designs from the internet (some commercial, some diy) using a JFET
> the control element as Rds(on) changes with gate voltage.
** Did you see http://sound.westhost.com/project67.htm ?
I know just a tiny bit about that one.
> Is a MOSFET less / same / more noisy than a JFET?
** There is no significant fet noise as such - but the signal level is
lowish which can degrade things.
> Can the MOSFET handle less / same / more voltage signal for a given
** J- fets are better - that is why I used one.
> Do the same comments also apply to the MOSFETs in a hex inverter?
** Yes. I tried one with poor results in terms of THD
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