simple sample/hold circuit?

[Andy Sloane]

I'm thinking of making a quick, cheap midi2cv converter with multiple outs
using a PIC16C84 and a single DAC.. Like a PIC version of PAiA's design
(which IMHO is a little overcomplex).  My question is, what's a good way to
do sample and hold on the DAC output so that I can scan through all the
outputs using a single DAC?  I guess it doesn't need to hold for very long,
but I haven't written the PIC code yet so I don't know how long it needs to
hold for.

My electronic devices book suggests a design simply using a MOSFET and a
cap.  Is this the best way to go?  I've never really experimented with
mosfets before.  Obviously you'd need an opamp follower after that or
something... So are there any other s&h tricks I should know?  Can you do
this with BJTs somehow?  or opamps?

-Andy.