Suggested by Sprague in the 90's documentation, this circuit applies to AC motors. The documentation does not indicate the maximum engine power that can be controlled.
This circuit was found in an 80's Electronic Design. It amplifies TTL fast signals for a coaxial...
This circuit maintains on a flashing LED at a frequency determined by the capacitor. The...
Found in 1965 Radio Shack documentation, this circuit has a crystal phone output in the 14.8 kHz...