Hi Alain,

Thanks so much for sharing your experience. Before I started this thread, I too did some reasearch on this and as rsocor01 says got some very conflicting opinions. Which is why I am curious to know, did the system work effectively? With your design, did the problem get solved?

Of the units being marketed, I notice a lot (most?) seem to use a wimpy piezo disc as a transducer. I'm sure these cannot handle either the power, or the frequencies that would be required. Perhaps, these are also responsible in giving a bad name to the product as a whole category.

But, with a better designed (and more powerful, as the one you describe)) unit I dont see how it *cannot* work? Especially in the small environs of a vehicle engine compartment; I mean, imagine being blasted by a loud sound every few minutes; wouldnt the chaps prefer to take up residence in a quieter car?

BTW, Alain, was your unit designed to work in a car as well? How often did you have the bursts, and how did it affect the battery? I ask because there are times when I am away, and its not unusual for the car not to be used for days at a stretch.

Regards,

Anand