17 May
2009
17 May
'09
5:41 p.m.
On 16 May 2009 at 20:17, Ethan Dicks wrote:
Yes, it's pretty clever...
... and the schematic...
http://www.porticus.org/bell/images/35_dial.gif
One of my favorite schematics! Generating DTMF with a single
transistor. ISTR that the 113 modem was equally sparse in active 
devices, but I can't find a schematic anywhere.
THis is mildly OT, but does anyone know of a source of the schematic for
the computer-interfaced autodialler (is that a model 108???) with an
RS336 interface from about that time? Finding the actual unit would be
even better, but I suspect that's impossible over here.
-tony