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Electronics => Electronics => Topic started by: Tomomastchi-project on October 13, 2008, 12:43:10 PM

Title: Anti-parallel diode over speaker
Post by: Tomomastchi-project 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

Title: Re: Anti-parallel diode over speaker
Post by: izua 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.

Title: Re: Anti-parallel diode over speaker
Post by: Tomomastchi-project on October 13, 2008, 02:30:01 PM

Thanks a lot ;)
Didn't think about the speaker being an inductor.