Transistor Tester (CB21956E)

This transistor tester was found in a publication by Gernsback from 1960. The circuit can be used with current transistors.

Central Alarm (CB17451E)
This circuit is from 1999 documentation. However, it can still be easily assembled, as all...
IF amplifier with the S041P (CB21890E)
Found in the 1976 Siemens transistors manual, this circuit works with AM or FM IF signals. In the...
Wien Bridge Oscillator CA3140 (CB4923E)
We found this circuit in an old American documentation (80's). The circuit generates sine signals...