This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
Suggested by an American technical documentation, this circuit is polarized in order to provide an...
January 2017 - Mouser Electronics is shipping the new Littlelfuse TVS SP1043, SP1044 and SP1045...
This doorbell or buzzer as announced in a 1990s US publication uses an operational amplifier that admits...