This circuit found in the February 1992 issue of Radio Electronics magazine is designed to adapt an audio signal for use in a computer's ADC. It can be adapted to operate with microcontrollers.
This rather sophisticated circuit does not recognize false tones, such as harmonics, and can be...
Suggested by Hughes in 1968 documentation, this circuit makes use of a transistor matched pair and...
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...