Transistor Tester (CB21956E)

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

bq51222 Wireless Receiver Qi
April 2017 - Texas Instruments bq51222 integrated circuit for chargers and other Qi wireless power...
Two-Tone Decoder (CB19928E)
Using two 567 PLLs, this circuit recognizes two audio tones in sequence providing a signal for a...
Door buzzer or alarm (CB20492E)
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...