I need a to make a circuit that measures signal strength, something for a amp project. I need to know in how many volts my output is. Thank you so much for helping.
Sorry if I didn't explain myself clearly. I want to make a sonar distance meter (just for a meter or two) I will have a speaker transmit a 50khz signal and then the mic listens for the echo. I hope by listening to the echo I can determine how far away the object is. I will use a PIC16F57 to do all of that, my only concern is how get the highest part(in voltage that is) of the signal.
To measure the distance of a few meters, line of sight, I have an idea.
Use a LED transmitter/receiver and an audio transmitter/receiver.
At the receiver end, use the LED circuit to start the timer and the audio circuit to stop the timer. Convert the result to distance.