This circuit provides a reference voltage for calibration. He uses a diode in a small thermal chamber. We found this circuit in an old american documentation.
The figure shows how to use the 4 transistors of the IC 4007 as a current drain. The circuit was...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This control allows to start or stop a motor up to 3 or 4 A with a low intensity signal. The...