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Ooze
New Member
4 Posts |
 Posted - Aug 27 2005 : 05:37:09 AM
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Hey there! I'm an enthousiastic motorcycle driver. Some of you my know that bikers seem to pop up out of nowhere.... well, one of the reasons for that is (apart from the bikers that drive like @ssholes), is that most bikes ern't really visible. Apparently one of the psychological reasons is because the headlights on a bike do not resemble the predator's two eyes, but have only one.
Nowadays, most cars have their headlights on during daylight, so bikes don't stand out anymore when they also run their headlights. One of the solutions is running lights. Another one is dimming the high beam. And here's where I need your help.
I am looking for help in designing a circuit with I can chop the voltage on my hi beam.So, the 14V needs to stay 14V, but it needs to be chopped into blocks of, let's say, 100Hz, with variable duty cycle.
I found that the BUZ11 is a good MOSFET to switch the beam. Now, I need something that converts 14V (12V) into a AC with variable dutycycle.
Any bright ideas?
Thanks in advance,
Steven
http://www.geocities.com/hotsyflotsy/ |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Aug 29 2005 : 09:33:11 AM
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The easiest way is to just put a resistor in series, but you waste a lot of power. Probably the reason you don't want to do that.
That said, you can use any PWM motor controller to also control your light. There is one on this site, but since it's not "real" PWM it doesn't do the best job. http://www.discovercircuits.com lists several suitable PWM controllers.
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sergiosparks
Apprentice
Philippines
132 Posts |
Posted - Aug 30 2005 : 07:15:30 AM
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How about putting two diodes in series there would be about 1.2 v drop..you think that's dim enough ?
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Ooze
New Member
4 Posts |
Posted - Aug 30 2005 : 11:17:09 AM
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Dunno. But i'd get stuck with the same issue as the resistor: lots of heat dissipation. Motorcycles don't have big batteries nowadays, so I'd lose as little power as possible.
http://www.geocities.com/hotsyflotsy/ |
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Dimming Hi-beam ?
