He has ditched the ultrasonic module seen in those experiments. The new rig drives the piezo element using a 27V source. After each ping is sent out, the microphone input is immediately captured ...

So how does it work, though? The magic is in the special bridge, which contains a piezo element. The bridge picks up the strings’ vibrations and sends them to a little pre-amplifier, which ...

PZT-5H tubes is best for that. In case of a hydrophone it's possible to have the hydrophone attached with a long cable and the amplifier/buffer circuit close to the piezoelectric elements. It's of ...