This low-power circuit was found in the March 1990 issue of Radio Electronics magazine. It consists of a tone control solution for portable turntables.
Found in an Elektor from the 90s, this circuit is suitable for viewing audio signals on an...
This project was found in a 1982 publication, using only two transistors. Signal injectors are...
Found in documentation from the 1980s, this circuit uses components from that time. The circuit is...