[sdiy] moog high pass flter

[Tony Clark]

> The Moog HPF is the ugly twin of the LPF.  It uses the same variation
> of transistor impedance vs current... but has to use an NPN-PNP pair
> that must be closely matched to each other, and to three other pairs. That
> makes it hard to do
> 
> It also does not feature resonance as the LPF does.

   Well I like the idea of a Moog ladder-style HPF, in fact I even 
breadboarded one up and got it working, but it may take a long time to 
find parts that are suitable for a _small_ design (and not something that 
looks like a mono-block!).
   Probably fun as a one-off, but not well suited for production runs.

   Cheers,

   Tony

-----------------------------------------------------------------------
         The E-Music DIY Archive - New Site Coming Soon!
-----------------------------------------------------------------------

"We wouldn't want to ship something that doesn't work"
   - Carl Stork, general manager, Microsoft Windows division
     Excerpt from EE Times April 2, 2001