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  1. #11
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    Did they ever give a reason as to why? I can't think of any logical reason as to why relays would not work in a negative trigger setup. I can see why positive would not work with a typical automotive relay since they need 12v. I guarantee the mute output will work with a relay just off the principle of it being grounded properly enough to trigger a radio's negative mute trigger. I would diode isolate the 85 terminal on the relay just because I don't where the 5v standby voltage is coming from in the ALP (some relays have internal diodes for this btw).

    :edit: What is the ALP "fog" wire doing during standby and activation? I'm assuming 12v on and either ground or 5v off? If so that should work for a positive relay trigger. Just trying to figure this out since their response doesn't make sense to me.
    Last edited by ApexOnYou; 09-25-2014 at 08:17 PM.

  2. #12
    Senior Member Tman's Avatar
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    For the simple reason their system is made to deliver very small signal , 5 volts , but with very very very low amperage.

    If you know about Arduino , then you can use the green\blue wire.

    Alp is not like the Laser interceptor that triggers a ground contact upon alert.

  3. #13
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    It will trigger a relay if you use the mute output to trigger a relay. You would do this by connecting terminal 86 of the relay (coil +) to ignition 12v and terminal 85 (coil -) to the ALP mute output with a diode for the reason in my last post. You can still use that same output for radio mute, you would just run a second wire to the radio mute with a diode.

    So:
    12v ignition -> relay terminal 86
    ALP mute -> relay terminal 85

    This will operate a relay, this is called a negative trigger. The relay coil is being triggered when the ALP provides ground.

  4. #14
    Senior Member RedRocket's Avatar
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    Quote Originally Posted by Tman View Post
    For the simple reason their system is made to deliver very small signal , 5 volts , but with very very very low amperage.

    If you know about Arduino , then you can use the green\blue wire.

    Alp is not like the Laser interceptor that triggers a ground contact upon alert.
    In that case,there are "Solid State" relays that operate on lower voltages & current requirements.

  5. #15
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    tried and tested but both the LI and ALp with an auto motive relay the mute wires are not a solid ground so it will not trigger a a normal relay
    I got this idea from another ozzie but try this one

    I have one activating a number plater IR strip on alert ..also I need to install a few more to kill my amps on alert as my radio doesn't have a mute wire as it has Bluetooth shit

    http://www.ebay.com.au/itm/like/1810...=true&lpid=107
    Last edited by deano; 09-26-2014 at 08:36 AM.

  6. #16
    Moderator winterbrew's Avatar
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    I've got relays operating on the +5V green wire, as discussed in the 'blue and green wire' thread if its of use ;

    http://radarandlaserforum.com/showth...ll=1#post25378

    Works well on ALP alert.

    Edit : looks like you just beat me to the post Deano
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  7. #17
    Senior Member Tman's Avatar
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    Quote Originally Posted by RedRocket View Post
    In that case,there are "Solid State" relays that operate on lower voltages & current requirements.
    You are right RR , i tried this route ...but it does not work , the alp does not supply enough juice to trigger it ,
    and the relay is quoted to trigger @ 3 volts.

    As i explained before , the Alp works on tiny voltage , the only route that works is Arduino , i did it this way
    and it works. It took me a month to find the solution.

    Apex , i pray that you try your route and see by yourself .

    '' This will operate a relay, this is called a negative trigger. The relay coil is being triggered when the ALP provides ground. ''

    The explanation is that Alp does not provide ground : the blue\green provides + - in stanby mode ,
    then upon alert the polarity is reversed - + , that is why the Team says the relay is not supported.
    Last edited by Tman; 09-26-2014 at 12:52 PM.

  8. #18
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    My ALP'd car is down waiting for insurance to get their act together but I will play around with this later in the week. I did not know that it wasn't providing a solid ground, I understand your point now. I will report back with the actual impedance to ground. Either way it sounds like there is a solution for triggering other circuits should anyone desire so I'm more or less just curious of what the unit is actually doing now.

  9. The Following User Says Thank You to ApexOnYou For This Useful Post:

    Tman (10-01-2014)

  10. #19
    Senior Member RedRocket's Avatar
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    Well as it's a DC power sys. source,"Impedance" isn't the issue & checking for that won't tell you much.In your situation,actual "resistance" is the cause from poor bonding between the common ground connections is.

  11. #20
    Senior Member BestRadarDetectors's Avatar
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    Quote Originally Posted by RedRocket View Post
    Well as it's a DC power sys. source,"Impedance" isn't the issue & checking for that won't tell you much.In your situation,actual "resistance" is the cause from poor bonding between the common ground connections is.
    The radio mute wire an be used with a relay if needed. I have been getting too busy that I really cant keep up with every thread and I have missed viewing several threads. If someone has a particular issue please PM me and I will help.
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