Found in a 1968 Electronics World, this circuit uses components from the era. In this circuit, a small incandescent lamp is activated when it gets dark.
This circuit was published in an Italian magazine Radio Elettronica in February 1976. The...
Found in a Popular Electronics from the 90's, this circuit converts a 40 V symmetrical source to a 5...
This high selectivity circuit for single tone decoding was found in 1970s documentation. The coil...