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Old 03-19-2009, 02:40 AM #1
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Default WTB: Pulsed PHR-803 Driver

Title says it all.....any ideas?


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Old 03-19-2009, 02:56 AM #2
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Default Re: WTB: Pulsed PHR-803 Driver

There is a circuit called the 555 circuit. Google it. I dont know much about it but you could try to use that before a driver.
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Old 03-19-2009, 03:16 AM #3
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Default Re: WTB: Pulsed PHR-803 Driver

You basically want a driver that can be modulated. You'll still need a signal source, such as the 555 timer, as suggested, to provide a +5V signal.

DrLava sells his "flexmod" driver that can do that, just check out his website posted under the Flexdriver thread, it's one of the links up top.
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Old 04-11-2009, 06:03 PM #4
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Default Re: WTB: Pulsed PHR-803 Driver

hummm im doing some research and i found a good way to have one without 555 timer;

555 timer can supply a maximum of 200 ma, so for a PHR it must be fine; otherwise we must use transistor to boost to high amperage

Quote:
Using a standard 555 timer IC and a 2N2222a NPN transistor, it is possible to create a drive pulse with width down to a few microseconds and amplitude to about 800 mA. The 555 timer chip has a rise/fall time of about 100 ns and current drive capability of 200 mA
check this page for high current http://www.jensign.com/opto/ledlaserdrivers/index.html

check google about basic circuit with the 555 timer, playing with R, C allow us to modify the frequency, and the wide of wave current, pretty easy.

without a 555 timer, check the precious document attached which can supply 2.7 A, pulse @17uS@100hz :


(it come from google books)
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Old 04-11-2009, 06:16 PM #5
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Default Re: WTB: Pulsed PHR-803 Driver

problem attaching file while modifying...

Somebody know how drLava's Flexmod is working, i don't fully understand if we can change the duration pulse and the frequency of current ?
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WTB: Pulsed PHR-803 Driver-pulseddriver2.jpg  
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