This simple three-LED sensor uses an NTC at the input. The circuit is based on an uncommon integrated component today. We found it in documentation from the 80s.
Found in an Electronics World of 1966 this circuit is intended for use with a microphone as an...
This VFO (Variable Frequency Oscillator ) has the output frequency controlled by a potentiometer....
This simple alarm circuit was found in the May 1990 issue of Radio Electronics magazine. The...