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Old 12th Jan 2010, 1:43 am   #63
igranic
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Join Date: Jan 2005
Location: North Bedfordshire, UK.
Posts: 395
Default Re: Homebrew Valve Tester

Les,

Care is needed with this type of switch. I have two here (no brand shown) which are superficially identical. However, one has MBB (make before break) contacts, the other is BBM (break before make). This initially caused me some confusion!

Edward
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