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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Electronic Scoreboard (CB16534E)
We found this digital scoreboard in a 1998 publication. It has two 7-segment displays, but it can...
Cable Tester (CB16567E)
The circuit shown is intended for cable testing, providing status indication via LEDs. The number of...
100 kHz Oscillator (CB22256E)
This circuit was found in an American transistor book from the 50's. The indicated transistors are germanium...