This passive piezo clicker is only audible in a quiet room, as is any other passive speaker attached to a CDV-700. The CDV audio output was intended for 10k ohm wire coil headphones, but sometimes headphones get in the way. The pulse out of the CDV is about 12v.Materials you need are a PL259 twist-o...By: DavidN71
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from Instructables: exploring - technology - robots http://ift.tt/1EX1iyx
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