This circuit filters low frequency noise from the turntable motor. We found it in a 1989 documentation. The font doesn't have to be symmetrical, but it should have excellent filtering.
Several analog TV channels operate with stereo audio signals, but the vast majority of receivers are...
The purpose of this circuit is to control magnetic door locks activated by the power grid. The...
This circuit was found in the February 1990 issue of Radio Electronics magazine. The gain is given...