This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the zener, the circuit can be used to monitor other voltages.
This LC oscillator with complementary transistors was found in an English publication from the...
This circuit generates two signals in phase opposition. The frequency is determined by R1 and C1...
We found this circuit in an old documentation from the 80's. The integrated circuit used is an...