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.
The TLC555 is the CMOS equivalent of the well-known 555 bipolar transistor. It can be used in the...
This circuit, which was common at the time, was found in the February 1973 issue of Radio...
This circuit was found in the used integrated circuit manufacturer's manual. The table beside the...