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 is from an old National Semiconductor component manual. The circuit can be...
We found this circuit in a 1977 Radio Shack documentation. The circuit should be powered, for...
The gain of this amplifier is 10 times and the excursion to the output voltage is 6.0 V (peak to...