Hey, I'm supposed to answer the following question:
A certain microphone is capable of delivering + 0.1 V when someone claps their hands at a distance of 20 feet. A particular electronic switching circuit has an input resistance of 670 ohms and requires + 20 mA to activate the switching action. Design a circuit that will connect the microphone to the electronic switching circuit in such a way that the switch is activated by someone clapping their hands.
I don't understand what the input resistance is about. Do they mean the resistance in the switching circuit, that would be connected to the output of an op amp?
I don't think they mean the resistance of the op amp, becuase we're doing ideal op amp analysis, in which case i htink we're supposed to assume the input resistance is infinite.
We're supposed to be solving these problems using basic op amp building blocks.
Can anybody help me about, just explain what htey mean by input resistance?
thanks;
sean