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 voice scrambling scrambler was published in the August 1982 issue of Radio Electronics...
This is the traditional configuration of an inverter amplifier with 100 voltage gain and...
This circuit was obtained in a 1980 publication. The transistors can be BC548 or 2N2222. The...