Don's source follower

[Hairy Harry]

Hello Don (et al)

I think the 1975 date would be significant. FETs were still kind of
pricey and most folks didn't use them unless necessary. And they were
less understood than today. The matching issue is one that almost EVERY high 
volume manufacturer would avoid in design.

But we are not that particular...

H^)  harry


>From: Don Tillman <don at till.com>
>To: mlloyd1 at enteract.com
>CC: synth-diy at node12b53.a2000.nl
>Subject: Re: Don's source follower
>Date: Mon, 26 Jun 2000 10:57:26 -0700 (PDT)
>
>    From: "Michael Lloyd" <mlloyd1 at enteract.com>
>    Date: Sun, 25 Jun 2000 21:13:01 -0500
>
>    Anyway, I did manage to find where I did actually see a circuit
>    that looks like what you described.  It's from an article in the
>    Journal of the Audio Engineering Society September 1975, Volume 23,
>    Number 7, pages 530 - 535. The article title is "A Complementary
>    Source Follower Circuit for Condenser Microphone Preamplifier by
>    T. Ken Matsudaira and Osamu Kono of Sony Corp.
>
>[Stopping by the local university library...]
>
>Bullseye!  Thank you so much!  Sure enough, Matsudaira and Kono
>described this exact circuit 25 years ago.
>
>They only talk about its use as the first stage of a condenser
>microphone preamp stage.  That's strange; I think this circuit has
>lots of potential applications.  And it's not clear why they use a
>regular source follower as a driver stage.  And they don't get into
>issues like distortions, driving low impedance loads, clipping, or the
>like.
>
>So maybe more research is necessary.
>
>   -- Don
>
>--
>Don Tillman
>Palo Alto, California, USA
>don at till.com
>http://www.till.com
>

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