Tuned active antenna (CB8412E)

Found in a 90s Popular Electronics, this circuit allows to select the operating ranges between short waves and VHF. MOSFET is uncommon today.

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Automatic Modulated Siren C (CB15856E)
The same basic audio oscillator as the CIR15855E can be modulated automatically by a relaxation...
Elevator Actuator (CB16556E)
This configuration was found in a 1988 documentation. It is a touch lift drive system. The circuit...
One transistor timer (CB21913E)
We found this simple timer in a Raytheon documentation from the 60s. The transistor is made of...