Everything non-Armonía...
#2835 by lingyueqing
February 27th, 2018, 11:08 am
I am trying to amplify an audio signal generated by a hydrophone. I am trying to work from this (very general) circuit diagram I have found online and in an electronics textbook I own.This is LM318N's datasheet: http://www.kynix.com/uploadfiles/pdf2286/LM318N.pdf

http://www.kynix.com/BlogImage/27.1.png

However, I am confused about what input and outputs correspond to what. The hydrophone is attach to a coaxial cable, which is diagrammed as such on its data sheet.

http://www.kynix.com/BlogImage/27.2.png

As of now I am using a connecter to break out the coaxial cable to a "positive", and "negative" wire. So, currently, my circuit is as such, with ground representing the 0v terminal on the bench top power supply I am using.

http://www.kynix.com/BlogImage/27.3.png

simulate this circuit

When I measure my Vout with an oscilloscope with the power supply turned on, I get a randomly oscillating garbage output, so clearly I am doing something wrong. Are all of my input and outputs correct. Should I be completing the circuit by connect Vout to gnd, or the + terminal of my hydrophone?