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 traditional flasher configuration in a June 1969 Radio Electronics magazine. SCRs...
This simple circuit indicates the conductivity of materials through two LEDs and two LEDs are...
This circuit was found in an Italian magazine Radiorama from 1960, but it can be assembled with...