30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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Locked relay (CB21220E)
This circuit can be used as a lockable shield. A pulse activates the relay that remains on even...
Battery condition indicator (CB9547E)
Found in a 90s documentation, this circuit makes use of D1, a switching diode that is uncommon today....
Series MT Micro Switches
June 2017 - New Honeywell MT MICROSWITCH Series can be ordered from Mouser Electronics for...