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This audio filter was found in the August 1993 issue of Radio Electronics magazine. It cuts low and high frequencies corresponding to rumble and scratch noises that occur on turntables.
This 1992 circuit uses an integrated circuit not common today. The Sanyo integrated circuit must...
This was one of the National Semiconductor clock modules very popular in the 70s and 80s. In the...
This digital / analog converter shield is suggested by MOTOROLA and is based on an operational amplifier...