Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

| Clique na imagem para ampliar |

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...