Found in an English publication from the 1980s, this circuit can be built with equivalent transistors such as the BC549. The signal must be applied to an external amplifier.
This circuit was obtained in a 1982 publication. There are many types of car alarms available to...
Found in Linear Technology documentation from the 90s, this circuit has a 100 V common mode...
This circuit can be used as a polarity indicator shield the direction of current circulation for...