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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Amplifier for ceramic capsule (CB9059E)
Found in documentation from the 1980s, this amplifier uses an integrated circuit from the time....
Alternator Monitor (CB15050E)
The purpose of this circuit is to monitor the operation of an alternator in cars with a 12 V...
Single Crystal Filter (CB6542E)
High selectivity filters can be obtained by combining same frequency crystals in series as shown...