This 1970 Electronic Design circuit uses a varactor or varicap. The circuit divides the frequency of a 150 MHz signal by 2. Similar versions appear on this site.
May 6, 2015 - Mouser Electronics, Inc., the global authorized distributor with the newest...
This TTL module can be used in counter and many of them can be cascaded to counts up to 99, 999,...
Placed inside the refrigerator, this circuit triggers an oscillator when the part is opened...