This circuit is from the Motorola LinearDatabook of 1990. It shows how it uses the LF355, 356 and 357 operational capacitive loads. The power supply must be dual.
Capacitors determine the frequency range together with resistors, and these components can be...
This circuit was found in the June 1970 Radio Electronics magazine. The power to the load is triac...
This circuit has its application suggested in an alarm system. The circuit is from an old RCA...