This circuit uses a resonant reed switch at the trigger frequency. The circuit is from General Electric in a 1966 documentation. This type of component is rare today.
This circuit was found in the January 1994 Electronics Now magazine. The transistors are general...
This circuit was found in a 1994 publication. It can receive signals from the 3 to 20 MHz band,...
This stabilized source can supply currents up to 200 mA with the indicated transistor or 500 mA...