Valic Posted July 18, 2006 Report Share Posted July 18, 2006 I am needing to find anyone that has made a headlight flasher or better yet the one off of the project links here. I have been trying to locate the Relay that was used. or if it is just a common relay. Thanks to anyone that can help.... Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 18, 2006 Report Share Posted July 18, 2006 This project?http://www.electronics-lab.com/projects/automotive/003/index.htmlThe current rating of the relay contacts must be at least as high as the headlamps' current plus more, since a cold incandescent lamp draws up to 10 times its operating current.The current rating of the transistor must be high enough to drive the relay's coil.The value of the 1k resistor feeding the base of the transistor must supply enough base current.I recommend adding a reverse-connected diode across the relay's coil to avoid breakdown of the transistor and 555 IC due to the inductive voltage spike. Quote Link to comment Share on other sites More sharing options...
Valic Posted July 19, 2006 Author Report Share Posted July 19, 2006 Yes that is the Project that I am working on.. The Relay is not labeled or the Transistor as well Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 19, 2006 Report Share Posted July 19, 2006 You must select a relay and transistor to match the current of your headlights and all the other things I mentioned.You also must select whatever parts you can find in your country that have those spec's. Quote Link to comment Share on other sites More sharing options...
Valic Posted July 20, 2006 Author Report Share Posted July 20, 2006 Ok thanks for the information Quote Link to comment Share on other sites More sharing options...
ante Posted July 20, 2006 Report Share Posted July 20, 2006 It’s better to use a semiconductor switch for this; the halogen lamps (and the relay) will suffer badly if turned on and of repeatedly. If repeated very often it might be les harmful since the filament is still very hot for the next pulse.Just my two cents! ;) Quote Link to comment Share on other sites More sharing options...
Valic Posted July 20, 2006 Author Report Share Posted July 20, 2006 Ante.. What sort of Semiconducter Switch are you thinking about??? I have been looking all day and have not found truely any that I think will work Quote Link to comment Share on other sites More sharing options...
ante Posted July 20, 2006 Report Share Posted July 20, 2006 A power MOSFET will do the job. Quote Link to comment Share on other sites More sharing options...
Valic Posted July 21, 2006 Author Report Share Posted July 21, 2006 Ok thanks Quote Link to comment Share on other sites More sharing options...
pantla Posted February 8, 2007 Report Share Posted February 8, 2007 Which transistor and relay are, usualy, used here?Please, give me some values!Thank's!!! Quote Link to comment Share on other sites More sharing options...
ante Posted February 9, 2007 Report Share Posted February 9, 2007 I wouldn Quote Link to comment Share on other sites More sharing options...
pantla Posted February 10, 2007 Report Share Posted February 10, 2007 What would you use? I don't understand? Quote Link to comment Share on other sites More sharing options...
ante Posted February 11, 2007 Report Share Posted February 11, 2007 I believe a relay will have a very short life in this application. A Mosfet must be dimensioned to cope with the load you Quote Link to comment Share on other sites More sharing options...
pantla Posted February 11, 2007 Report Share Posted February 11, 2007 Ok! Witch mosfet should I use? (current by one headlight is 3A) Quote Link to comment Share on other sites More sharing options...
ante Posted February 12, 2007 Report Share Posted February 12, 2007 If you mean a circuit diagram; No, I don Quote Link to comment Share on other sites More sharing options...
pantla Posted February 18, 2007 Report Share Posted February 18, 2007 Ok! Witch mosfet should I use? (current by one headlight is 3A) Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 18, 2007 Report Share Posted February 18, 2007 I thought car headlights are 60W and draw 5A to 6A when hot, and draw 50A to 60A when cold. They are turned on by a big strong relay. A 3A relay would be a tiny little thing and wouldn't even be needed since the switch could turn on a little 3A light without a relay.If I select a Mosfet that I can buy here in Canada, could you get it? I don't know which parts you can buy. Quote Link to comment Share on other sites More sharing options...
pantla Posted February 20, 2007 Report Share Posted February 20, 2007 Just name it! I'll see what I can do. Quote Link to comment Share on other sites More sharing options...
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