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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2.7 V Power Supply (CB8687E)
This circuit with 1% regulation aims at replacing mercury cells. We found it in a 1967...
Transistor Tester (CB18456E)
This transistor tester configuration can be found on this website with many variations. The...
Simple adjustable regulator (CB24429E)
This high current control circuit was found in a publication from the 1990s. The power transistor must...