This preamplifier circuit for turntable cartridges was found in the March 1994 issue of Electronics Now magazine. The circuit is suitable for magnetic cartridges.
This circuit was obtained from Linear Technology documentation from the 90's. The circuit uses...
In the figure we have a typical Wien Bridge oscillator with AGC. The negative waveform is sampled by...
In the figure we have one of the many ways to program the counting of a 4017. The circuit uses...