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.
Found in a 1980s documentation, this circuit uses as base a component of the era. The formula for...
For the 600 kHz range coil is formed by 35 turns of 28 AWG wire on a ferrite core with a diameter...
Found elsewhere in this section, but from other sources, this circuit is from a 1964 Electronic...