Scratch is the scratching noise that occurs mainly with old records. This high frequency noise is eliminated by the filter found in the February 1990 issue of Radio Electronics magazine.
This is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s...
This staircase generator was found in the July 1991 issue of Radio Electronics magazine. Its...
This 80's circuitry decodes stereo signals used in analog TV at the time. The circuit can be used...