This circuit was obtained in a French documentation from 1981 and can be easily assembled. The analog instrument itself can be replaced by the current scale of an ordinary multimeter.
We found this phonographic transmitter for the MW band in a 1956 documentation. The circuit has a...
The voltage of 30 V indicated in this project, shown in the figure depends on the diac used. It...
We find this circuit in an American 1980s documentation. The circuit drives a system that keeps a...