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LED Lights / 12 Volt / Halogen sockets / Flashcircuit WANTED

 
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educationmaster
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Joined: 11 Mar 2007
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PostPosted: Sun Mar 18, 2007 9:33 am    Post subject: LED Lights / 12 Volt / Halogen sockets / Flashcircuit WANTED Reply with quote

Hello all Gadgeters
I have a question from Germany. You can get al lot of 21 or 48 LED lamps as replacement for halogenspots. Now I want them as real bright strobelights for car use.
What Im looking for is a very easy way to have them flash from about 0,5 Hz to almost not visible flashrate. Id not like to etch a board, better way would be a experimental board with lines and/or dots and a Photo how to place and solder parts. (53 years old but e real novice to electronics)

Thanks to you all

Ruediger
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sun Mar 18, 2007 10:48 am    Post subject: Reply with quote

Are those lights you are looking at 12 Volts? If not you will have to make some serious modifications to allow them to operate at 12 Volts...

If it is a 12 Volt light then all you need is a simple flasher circuit. You want a flash rate of 0.5 Hz? That rate is one cycle per two seconds.

You could use a simple 555 timer to get your flash rate you desire.
http://www.doctronics.co.uk/555.htm
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educationmaster
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Joined: 11 Mar 2007
Posts: 4

PostPosted: Mon Mar 19, 2007 5:36 am    Post subject: 12 Volt LED replacements for 12 Volt Halogen Reply with quote

Thanks for the answer.
These are 12 Volt replacement lamps for halogen lamps. You get them with different sockets, at least here in Germany, with 21 or 48 LEDs.
Im not sure if the cicuit in the link will take 12 Volt and the output power used for the Lamp. The 0,5 hz ist just that i have a little space to have a sure 1 hz.

Thanks

Ruediger
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Alan
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PostPosted: Mon Mar 19, 2007 8:28 am    Post subject: Reply with quote

The 555 has a working voltage of up to 15 Volts. What you need to do is feed the output into a transistor that will actually handle the load.

Here is an example of driving a load, you will have to use the first link to calculate the value of components based on your frequency though.
http://www.cpemma.co.uk/555pwm.html

So at 1 Hz, is this going to be used as a turn signal indicator?
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educationmaster
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PostPosted: Mon Mar 19, 2007 10:47 am    Post subject: Use as Reply with quote

want to use that flashing / blinking as 2 blue or blue-red fake Policelight.
of cause only on private ground.

Data: 12 Volt, 20 or 48 LED, 2 or 3.5 Watt
100000 or 120000 and 450000 mcd

Ruediger
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Alan
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Location: Winnipeg, MB

PostPosted: Mon Mar 19, 2007 5:38 pm    Post subject: Re: Use as Reply with quote

educationmaster wrote:
want to use that flashing / blinking as 2 blue or blue-red fake Policelight.
of cause only on private ground.

Data: 12 Volt, 20 or 48 LED, 2 or 3.5 Watt
100000 or 120000 and 450000 mcd

Ruediger


OK that makes sense Smile
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