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.
Using transistors and lamps, this simple circuit was found in Popular Electronics. The circuit can...
This simple 1 transistor circuit was found in an American documentation from the 60's. The...
This configuration is from a 1964 US documentation valid for any FET. The range of power voltages...