Unijunction metronome (CB21701E)

This traditional metronome circuit is powered by voltages from 9 to 12 V and output drives a common speaker.

Simple Transistor Test (CB3815E)
This ttransistor test was found in a 1987 documentation. It is a simple oscillator that allows to...
Telephone Dialer for Alarm (CB18755E)
This circuit was found in documentation from the 90s. Its purpose is to dial a programmed number...
FET High Impedance Amplifier (CB13222E)
We found this amplifier with high input impedance and low capacitance, using FET, in a...