[sdiy] MPF102 sub

[KD KD]

4007 for the charger/reset, sync switch and extra?

I..Denny Crane!

http://images.cheezburger.com/completestore/2010/1/27/129090859416219921.jpg
http://27.media.tumblr.com/tumblr_ln40xlVKP91qhak6mo1_400.jpg
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Sorry for the top-posting, but...

I concur exactly with what Ian is saying.  4391s are great for VCOs but they
don't always work in other applications, especially where variable pinchoff
is an issue.  In those cases, I generally find the 2N5485 to be more
reliable.  It's also available in SMD (MMBY5485) for those with Euro
aspirations.

Also, I simply can't find ANY discrete MOSFETs without the protection diode.
The 2N4351 is a classic in this regard, but it is practically unobtainium,
and if you do find it you might expect to pay $5 or more for it.  Forget
that!  This closes the door on a whole pile of interesting switching
options, and really leaves one with no choice except to use analog switches
-- those of the DG variety are indeed a very nice way to go for most
applications, and they come in a large variety of configurations.  However,
just be careful not to order the "low-voltage" variety accidentally.  These
usually have an "L" after the number, like "DG418L" and they won't work for
synth-level signals.  The Vishay DGs in particular are generally less
expensive, but some types only seem to be available in the low voltage
configuration.