In this interesting circuit from Popular Electronics, the output voltage is the square root of the input voltage. Equivalent operational amplifiers can be tried out.
This fast-acting circuit uses any phototransistor as a sensor. The circuit drives a 30 V relay, but...
We found this circuit in a technical documentation from Texas Instruments. The generated signal is...
This circuit, from a 1997 documentation, is used to adjust the angle of permanence of vehicles of the...