Are piezoelectric disc-type buzzers waterproof? - test-drb@ccmp.vtda.org

14 May 2014

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 Message: 1 
Date: Tue, 13 May 2014 18:34:29 +0100 (BST) 
From: ard at p850ug1.demon.co.uk (Tony Duell) 

  All *seems* to be well now, other than the -ve
wire from the battery 
 compartment needing replacing; the system powers up and seems to "work" - I 

It is not uncommon for the electorlyte fro ma leaking battery to creep 
along inside the insulatio nfo one of the wires and corrode the wire 
strands themselves. This can obviously cause an open-circuit, it can also 
cause nasty intermittant faults. 

It happens on cars too, the battery wires then gain resistnace so things 
go wrong when the starter motor is used (t draws around 600A after all). 
That can be 'intersting' to trace if you are not expecting it. 

-tony  ? 
Corroded wires are also a well-known failure mode for the light meter in the Olympus OM-1
35mm SLR camera, although in the OM-1, the wires can corrode even if the battery does not
leak. 
? 
Bob 