This automotive circuit was obtained from an 80's schematic from the integrated circuit factory itself. The voltage regulator is still common, but the operational amplifier is of the time.
September 2016 - can be purchased from Mouser Electronics the new transceivers MAX348x and MAX349x from...
This egg timer has been found in an English magazine that no longer exists in 1982. The...
This doorbell or buzzer as announced in a 1990s US publication uses an operational amplifier that admits...