Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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28 V PWM Regulator (CB8502E)
Found in a Motorola's 1968 documentation, this circuit operates at 16.5 kHz. The output is 5 A....
Experimental Volume Control (CB4560E)
This circuit was obtained from an Auguist 1974 Everyday Electronics magazine. The circuit is still...
Under Temperature Switch (CB16266E)
To be used in greenhouses, heating or drying systems, this device activates a relay when the...