This circuit consists of a stereo audio compressor. We found it in Radio Electronics magazine from October 1968. The circuit uses an opto-coupler made with a neon lamp and LDR.
This filter was found in a 1975 American technical publication. The filter can be of any type and...
This motor logic control was found in the September 1985 issue of Radio Electronics magazine. The...
This configuration can be found elsewhere on this website and section. The circuit is from Popular...