Input switching

Discussion in 'General Electronics Chat' started by vdubin, Sep 4, 2012.

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  1. vdubin

    Thread Starter New Member

    Sep 22, 2009
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    Hey guys... I am working on a custom sign using leds. The problem i have is, full brightness to be seen during the day will be blinding at night. I was thinking of using a switching relay for power and having a resistor on one leg, triggered by an exterior light circuit to power the signs. What i have been looking into, is using a transistor setup to try for a solid state system that i can keep out of the weather.

    Any ideas? The load would be quite small 2-3 amps at 12-14v with a 12-14v trigger.
     
  2. #12

    Expert

    Nov 30, 2010
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    I disagree with the idea that you are going to "improve" a system that only uses one relay and one resistor by building a transistor rig. Just use a store-bought eyeball to fire a 120 VAC relay coil and have that one relay connect or disconnect a resistor.
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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  4. bertus

    Administrator

    Apr 5, 2008
    15,646
    2,344
    Hello,

    This is the second thread we have to close on a vehicle related subject:
    Transistor or relay

    Next try will result in a ban.

    Bertus
     
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