Bass control (CB8722E)

Found in a 1993 Electronics Hobbyst Handbook, this passive circuit can be used with common preamplifiers and amplifiers.

Low Voltage Comparator MC34071 (CB15284E
) Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 or...
Optoelectronic Detector (CB4615E)
In this circuit the photo-transistor signal is amplified by a Darlington step and then applied to a...
Fake alarm (CB24990E)
The flashing LEDs in this circuit simulate a working alarm and can serve as a deterrent to a...