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 FM receiver tuning step circuit was found in a 1960 documentation. No information about the...
This power supply for TTL and CMOS circuits with a voltage of 5 to 15 V was found in the Special...
This is a direction of rotation control for a small motor up to about 2 A with the indicated...