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I have a “Knock Box” for sale. (prototype unit)

Basically a high gain amplifier coupled to a piezo Transducer.

The Transducer is bolted to the engine block and transmits “engine knock” to the headphones via the high gain amplifier with gain control.

This handy tool can also be used to identify other engine noises like failed bearings etc.

Price is $69.00 plus $12.00 postage Aus. only

I can build more units if people are interested.

PM if interested.

post-18394-1140610101.jpg

Edited by Bov
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https://www.sau.com.au/forums/topic/106925-knock-box/
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