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.
With the coded activation of the relays, it is possible to control which of the 16 outputs...
The integrated circuit used in this application is not very common. Transistors and resistors...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...