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.
In the 110 V network, capacitors of 200 V or more and in the 220 V network, capacitors of 400 V or...
This circuit makes use of older operational amplifiers, but can be designed on the basis of modern...
This 12 V incandescent lamp switch with time delay can be found in old documentation. The SCR can...