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 has a maximum frequency of 10 kHz and a linearity better than 0.01%. The circuit is...
This oscillator can generate 2 to 10 MHz signals and was found in an American 1980s documentation. The...
In fact, it is a night light system that automatically turns on the outside lights when it gets...