This common circuit using operational amplifiers was found in the 1993 issue of Radio Electronics Special Projects. The circuit is sandwiched between the pickup and the amplifier input.
Indicated for vinyl media recovery, this circuit is from the 80's, having been found in an...
This levitation circuit keeps a small globe floating in space under the action of a magnetic...
This frequency-corrected 1 kHz circuit has a nearly perfect rectangular signal. The circuit is...