1964 Antique MODEM Live Demo

[Jim Battle]

Brent Hilpert wrote:
...
> Here's the schematic for amusement (note measurements), pretty simple except
> for the specced coils:
> 
>   http://www3.telus.net/~bhilpert/tmp/LDSModelAModem.gif

The power supply has a multi stage filter to get rid of ripple.   I 
would have thought investing in the extra diodes to make a bridge 
instead of the half wave rectifiers would have been cheaper than the 
extra C's & R's.