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Step 6Magnify
Position a magnifying glass in front of the phototransistor, in an attempt to focus the beam. You should hear the most noise from the amp when it is positioned correctly.
At this point you may need to adjust the volume on the amp and preamp. Turn it up until you hear feedback, then turn it down until it goes away.
At this point you may need to adjust the volume on the amp and preamp. Turn it up until you hear feedback, then turn it down until it goes away.
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