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Michael Black[_2_] · July 24th 12, 12:59 AM posted to rec.radio.amateur.homebrew

On Sun, 22 Jul 2012, wrote:

I have a nice auto multimeter. The continuity buzzer's out so I wanted
to test it, replace with a radio shack element.

The meter turned itsself on inside the snapbox. Apparemtly the contacs
touched killing the buzzer or driver.

But you should never keep a meter on ohms or continuity. Because those
are vulnerable ranges. You turn it on and measure some voltage, and bang
you blew a fuse if you were lucky, you've damaged the meter if you weren't
lucky. Keep it on a voltage range, which can handle anything that would
come across the leads. Put it on a higher voltage range if you really
worry, though the meter should be protected for overvoltage.

Michael VE2BVW

When I tried it last, the buzzer buzzed twice then died.
Positive inside contact circle or outside ring ? Probably a standard

vu2nan · July 24th 12, 05:06 AM

Quote:

Originally Posted by

On Sunday, July 22, 2012 9:13:21 PM UTC-7, vu2nan wrote:
;793804 Wrote:
> what is postive and negative on a round buzzer where contacs are an
> inside center circle and an outside ring ?
>
> or does positive and negative matter with a piezo buzzer ?

I suppose you are referring to the piezo element alone. In that case the
answer is 'no polarity' as the element responds to an ac signal only.

--
vu2nan

there's an inverter inside my multimeter ? why are peizo buzzers listed in Radio Shack under DC voltages ?

Reference for Piezo Buzzer basics:

http://www.buzzer-speaker.com/manufa...o%20buzzer.htm

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