Bias oscillator for tape recorders (CB7339E)

This circuit was found in a 1967 Electronics World. The circuit uses components of the time that are difficult to obtain, such as the transformer.

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Water Pump Control (CB16951E)
This circuit uses reed switches as sensors. We found it in a 1992 documentation. A float at a...
Triplicator for ionization chamber (CB21200E)
Found in Electronics Now, this circuit generates high voltage to charge a capacitor in an...
TTL Optical Interface (CB16022E)
In the figure we have a Texas Instruments circuit for TTL interfacing using discrete transistors. The two...