This circuit was found in an Experimenters Handbook of the 1990s. The purpose of this circuit is to keep constant the audio signal level of a system, increasing the lower signals.
This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the...
This 5-range current measurement circuit was found in the September 1989 issue of Radio...
This oscillator with crystal for overtone operation was found in an old American documentation. The coil...