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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Ring Counter using Lamps (CB6599E)
This circuit was found in Motorola documentation from 1966. The lamps are according to power and...
Locked Timed Alarm (CB17043E)
This circuit, which uses components still common today, was found in a 1997 documentation. It...
Waiting music (CB9113E)
This circuit is intended to apply the music signal from a stereo to a telephone line for the...