Found in an Electronic Design of 1964, this circuit is intended to the signal amplification in the 88 to 108 MHz band. The transistor can be a modern equivalent.
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...