Device is working

The pulse collection device is now working, however my PC’s audio card is refusing to accept as an audio device. One thing that could be a cause is that I may need a second stage amplifier. I came to the conclusion after using a multimeter to measure the voltage. The multimeter seems to respond to me when I hit the piezo film however the output voltage is very low. This is a major set back in my project as I need a working device in order to collect pulses for my report.

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