On some newer cars that use halogen headlights as a DRL and low or high beam on the same bulb. Is there a module or a circuit that senses the change from drl pwm to full voltage output available? What I am thinking that if a resistor and cap across the output going to the headlight the dc voltage change should be significant to use a battery voltage detector ie 741 op amp and drive a relay to provide two outputs, output 1 to drl led and output 2 12v to drive headlight high or low beam. Most people are using relays and getting 12 volts from the battery. Getting all the power from the headlight lead this way would retain the factory cars response to when the drl and headlight is on or off when driving the leds.
Headlight PWM sense module or circuit
- Thread starter cjdee
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Alaric Darconville
Flashlight Enthusiast
Yes, some cars use halogen headlamps as a DRL, whether on a low beam at 60% voltage or a high beam at 50% voltage. (Not sure exactly what your sentence means.)
Why would you need that? Also, on many PWM circuits, even the "full voltage" is pulse-width modulated.
Are you trying to move the DRL function away from the headlamps? It's hard to tell from all these words poured out here.
There's a module from Web Electric, the DRL-1 (described (and sold)here), that moves the DRL function to the turn signals.
If they're only getting 12V from the battery, their charging system has some serious problems!
SubLGT
Flashlight Enthusiast
Sounds like this is related to: http://www.candlepowerforums.com/vb/showthread.php?428128-Headlights-with-PWM-DRL-Dimming-LED
Alaric Darconville
Flashlight Enthusiast
Could be! In which case: Closed.
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