What’s the Reason to Diode Isolate?

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bqe.

Member - Posts: 33

Joined: November 22, 2006

Location: United States

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?

kgerry

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Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: November 28, 2006 at 4:50 PM / IP Logged

feedback will keep them both on often....

Kevin Gerry

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since 1979

bqe.

Member - Posts: 33

Joined: November 22, 2006

Location: United States

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

bsd1

Copper - Posts: 62

Joined: August 01, 2006

Location: California, United States

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.

KarTuneMan

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Joined: December 14, 2004

Location: Isle Of Man

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.

What’s the Reason to Diode Isolate? -- posted image.

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

evois

Copper - Posts: 56

Joined: July 07, 2006

Location: United States

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 (+)?

jpease

Member - Posts: 9

Joined: November 01, 2006

Location: United States

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?

evois

Copper - Posts: 56

Joined: July 07, 2006

Location: United States

Posted: December 01, 2006 at 6:55 AM / IP Logged

it's easily accessible, at radioshack.

dea,can

Copper - Posts: 284

Joined: January 12, 2006

Location: Saskatchewan, Canada

Posted: December 03, 2006 at 2:51 AM / IP Logged

What’s the Reason to Diode Isolate? -- posted image.

dragon

jpease

Member - Posts: 9

Joined: November 01, 2006

Location: United States

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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