Found in a 90’s Radio Electronics, this circuit uses a component from the time, difficult to find today. It generates 12 tones in different octaves.
This circuit was found in the September 1989 issue of Radio Electronics magazine. The circuit uses...
This circuit controls current heating elements according to the power transistor used. The sensor is...
The third version for the 4098 is shown here (the others are CIR17E and CIR138E). It is a...