27 MHz Oscillator (CB24983E)

This tunnel diode oscillator was found in July 1986, Radio Electronics magazine. Note the low supply voltage.

Tachometer with the LM3900 (CB4030E)
The circuit presented is from the Motorola Linear Databook of 1990. The integrated circuit is a...
DC Motor Control (CB12361E)
This linear speed control for DC motors up to about 2 A was found in a 1978 publication. The power...
Manual Advertisement Canceller (CB4217E)
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...