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the12volt`s installbay - Mobile Electronics Forums the12volt's install bay / Car Security and Convenience - Hot Topics

Subject Topic: What’s the reason to diode isolate? (Topic Closed Topic Closed)

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bqe.
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Posted: November 28, 2006 at 4:32 PM - IP Logged  

Why is it necessary to diode isolate a glass break sensor and motion sensor if there not connected to the door sensor?
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kgerry
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Posted: November 28, 2006 at 4:50 PM - IP Logged  

feedback will keep them both on often....
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bqe.
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Posted: November 28, 2006 at 5:51 PM - IP Logged  

Can u explain how and why the feedback would occur without any of the sensor's being  triggered?  Thanks
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bsd1
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Posted: November 29, 2006 at 12:06 PM - IP Logged  

If both sensors are connected to a dedicated (not shared with door trigger) sensor input (same zone) of your brain, logically that doesn't matter because your brain can't identify which is which when it's triggered.
When they are connected together to the door trigger, for instance, feedback can cause your domelight to be on unexpectedly. Other than that, isolation with diode doesn't make much sense.
Say I connected hood and trunk triggers to the same input, same zone violation appears on your 2-way remote display anyway.
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KarTuneMan
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Posted: November 30, 2006 at 3:57 AM - IP Logged  

A diode STOPS both a NEG(-) signal and a POS(+) signal from going in a certain direction....depending on the placement of the diode.

common 4000 series diodes

In some cases....bigger IS better...

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evois
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Posted: November 30, 2006 at 11:41 AM - IP Logged  

taking this diagram as correct, why is it that if you use an ohmmeter it shows continuity if I use the (+) of the ohmmeter to the (+) of the # 1 diagram and the (-) of the ohmmeter to the (-) of the diagram?  Is it because electricity travels (-) to (+)?
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jpease
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Posted: November 30, 2006 at 10:38 PM - IP Logged  

anyone know a good place to buy diodes online used for automotive security online and what should I buy. Link?
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evois
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Posted: December 01, 2006 at 6:55 AM - IP Logged  

it's easily accessible, at radioshack.
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dea,can
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Posted: December 03, 2006 at 2:51 AM - IP Logged  


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jpease
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Posted: December 04, 2006 at 9:42 AM - IP Logged  

evois wrote:
it's easily accessible, at radioshack.

anyone have a part number/sku?   or link?

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