Author Topic: Anti-parallel diode over speaker  (Read 1990 times)

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Offline Tomomastchi-projectTopic starter

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Anti-parallel diode over speaker
« on: October 13, 2008, 12:43:10 PM »
Hi,

I want to use a M-LSP-1 speaker. It is 100 Ohm 6V. On the site I ordered it(voti.nl) it said that if you want to connect directly to a PIC, you should connect an antiparallel diode with it. What does this mean? It sounds like I have to connect the speaker between the O-pin of the PIC and the mass, get a diode parallel to it and reverse its polarity. Am I right?

Thanks
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Offline izua

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Re: Anti-parallel diode over speaker
« Reply #1 on: October 13, 2008, 02:15:44 PM »
yeah, the diode arrow should be towards the pin.
since the speaker is an inductor, when it will be turned off, it will create a big potential difference with respect to ground at the pin, and it may damage it. the diode forces the current through the speaker again.
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Offline Tomomastchi-projectTopic starter

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Re: Anti-parallel diode over speaker
« Reply #2 on: October 13, 2008, 02:30:01 PM »
Thanks a lot ;)
Didn't think about the speaker being an inductor.
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