Alarm Siren (CB20327E)

This powerful siren is suitable for warning or alarm systems. The components are current and the transistor 3055 must be mounted on a good heat sink.

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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...