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Radar detector and stuff

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  • #16
    Originally posted by jmenon View Post
    What is the max voltage for the LED? they cant take 12v?
    (I'm not expert by any means on this stuff, I just hack away until it works)

    I tested red, green leds and they are not bright enough for daytime use. White led's are the way to go.

    White led's have a "forward voltage drop" of -3v each and around 200ma max current controled
    by varying resister values.

    Led's have around a 20-30 degree viewing angle

    Mounting in line of site within the viewing angle is quite bright. You might not need a "whole" strip of them.
    I was going to go with more leds's but settled on using just 2 leds because they are more then enough when
    mounted in the right position.

    First testing 2 white leds they where way to bright at night, would totally light you up, almost blinding. Had
    to put a switch on the led pod for high and low levels for night or daytime.

    Led example....

    Typical value for white LED = 3v and 200ma

    Example in a series circuit on 12v circuit white with -3v forward voltage drop and 200ma

    The most leds would be 4 leds. 12v -> -3v, -3v, -3v, -3v -> 0v at around 200ma total

    Example in parallel circuit on 12v circuit . You can use as many leds as want but will draw a lot more power to run.

    10 leds -3v running at 200ma "each" = drawing "2" amps.

    running series if a led burns out, circuit dies, but only have one bad led to replace.
    running parallel if a led burns out it will over voltage the rest of the leds and blown them all out.

    Here's a online LED calculator to help figure values.

    https://www.hobby-hour.com/electronics/ledcalc.php


    I'll post "my hand drawn" schematics later.











    Our ability to distribute interesting information is out pacing our ability to create it.

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    • #17
      This should get the project going.....

      The 2N3904 transistors in this config are running at around 200-250ma if you run higher amp levels you would need to replace with higher
      rated transistors.


      rd-bob.jpg




      rd-pod.jpg
      Our ability to distribute interesting information is out pacing our ability to create it.

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      • #18
        Just thinking might be able to tap into bikes system and use led alert lights for a staging light / shift light too, when and if I get to the
        drag strip again. Make some sort of pigtail from bikes stage/shift light, remove rd and plug into breakout box, hmmmmm....
        Our ability to distribute interesting information is out pacing our ability to create it.

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        • #19
          looking at this project again. How are you getting a volume signal from your RD? How does the LED light up if you do not have a source out of the aux out volume port of the RD? Does it give that signal out of the power cord?

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          • #20
            No volume port / aux used. (not enough volts / amps)

            This is a hack of the Escorts builtin smart cord features.

            On the Escorts RJ plug, it has, + , - and 2 signal wires.

            Google "escort smartcord wiring diagram" for more general info and that should get you going in the general
            direction. Then what I did with it might make more sense.




            Our ability to distribute interesting information is out pacing our ability to create it.

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            • #21
              yep I have a smart cord.. That does have a volume mute funtion built in. So there is a volume source on that... cool. plan to use a LED white tape strip with 6-10 lights... so I can see it for sure.

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              • #22
                I used my 8500 Escort/Passport ear-pod out- put using a 3.5 mono plugged wired to a bank (11 led's) to get a lighted warning.
                The LED module is one like you clip to a ball cap, with the power coming from the ear jack. About 2.5 volts +or-
                I have some pics on the setup so email me (opie3535@aol.com) and I'll send pics on it. I have ran the setup for several
                years in the car (when stereo is turned up, most always) when you can't hear the audible warnings. I run the same LED
                fixture on the Zed. With volume turned all the way up on detector wheel/switch, you get 3or4 flashes then you will take
                a look at the display on the detector to see what it is. Simple and cheap too, about 10 bucks and a half hour to wire
                it all up. I have the LED bank velcro mounted under the windscreen so daytime it works well too.
                "If it ain't broke, don't fix it"

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