This low power circuit was obtained from an American 80's documentation. The circuit indicates the voltage of a battery being trimmed by the trigger point. The transistors can be the BC549.
This circuit came out in an American magazine that no longer exists. It's the Electronic...
The circuit shown in the figure causes the lamp to light up after a certain time determined by the...
The high number of transistors on this radio for the medium wave range is an indication of its...