This circuit is from the 80's, using an integrated of the time. The circuit serves as a reference, as this type of dialing is no longer used today.
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...