Brian and Fred,
    I started to send the PPM tester schematic to the list but noted how
large the file was so I aborted the transmission.  I don't know if it went
to the list at all or what.  I sent a copy to reid.  If you two or anyone
else is still interested in the schematic I will send it direct to you if
you wish.  It is a .BMP file and can be viewed with MSPAINT as you may know.
Usually I can peel your email off of the header when you post a message to
the list.  That way, people not interested in the device don't have to clog
up their in basket with a huge file they don't need.
    Best wishes,
    Mike Huttinger