This circuit is from an American 80's documentation. The circuit indicates when the voltage of a 9 V battery drops below 7 V. The transistors can be BC548.
This circuit was found in a 1968 General Electric manual. The circuit is for 3 A motors but can be...
With this circuit it is possible to monitor a signal that is being recorded on an old tape...
We found this circuit in the September 1995 issue of Electronics Now magazine. The circuit has 6...