Bass control (CB8722E)

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

Constant Current Source (CB12272E)
Constant currents from 10 mA to 1 A can supply the load, depending on the selection made by S1. Q1...
Regulators with short circuit protection (CB9963E)
In the figure we have two typical configurations of voltage regulators with protection against short...
Precision full wave rectifier (CB8244E)
Found in an old Radio Electronics, this circuit uses current components, used to rectify AC...