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Old 04-03-2004, 02:55 PM
E Fitzgerald
Join Date: Mar 2004
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Default RE: Testing a fishfinder?

Melnic - allow me to clarify my statement - it is actually the output stage of the echosounder that I am worried about. If the sounder is putting out a fixed power and the resistive load presented by the transducer is lower than expected then the sounder will have to flow more current to maintain power output. On most sounders I would expect the output stage to be tolerant of this but some may not,..... better safe than sorry.

In general, transducers are not perfectly efficient when it comes to converting electrical energy into mechanical energy so some heat is generated within all transducers. The transducers with which I am familiar use adhesives, etc and too much heat can soften the adhesives which would temporarily change the elctroacoustic chararcteristics. In extreme heating cases I suppose it could be perminent effect.

E Fitz
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