Period to voltage converter (CB8869E)

This circuit was found in a 1969 EEE. The circuit uses transistors from the era that can be replaced by modern equivalents.

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Dual adjustable symmetrical power supply (CB25957E)
This dual adjustable power supply was found in the June 1990 issue of Radio Electronics magazine....
Multipurpose Alarm (CB17301E)
We found this simple alarm circuit in a 1986 documentation. The circuit uses sensors of the NA...
Up to 10 MHz Oscillator using Transistors (CB9416E)
This circuit, from a 1973 documentation, can be made with BC549 transistors. The frequency depends on...