Debouncer (CB9277E)

This circuit was found in a 1967 American documentation. The switching diode (tunnel) used is an uncommon component today.

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Liquid Flow Meter (CB6340E)
This circuit was found in an old Linear Technology documentation. The working principle can be...
Scratch and Rumble Filter (CB12432E)
Scratch is the scratching noise that occurs on old, scratched discs and the rumble is the...
Commercial Portable MW Radio AT235 (CB18430E)
This 6-transistor receiver was manufactured in Japan in the 60s. The circuit is superheterodyne and has a 6V...