This circuit was found in an American documentation from the 90's. What it does is provide at the output a voltage that is the average of the voltages set for the inputs.
If we modulate a beam of light from an LED, for example, we can receive this beam of light at a...
This astable multivibrator oscillates at a frequency of 1 kHz given by the capacitors and the base...
This 1990 circuit can also be used with fixed sound systems. What it does is trigger a set of LEDs...