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Old 06-19-2008, 09:01 AM #1
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Default Pulsed driver ideas

In the last installment of "driver ideas", the great minds of this forum came up with a pretty easy to use boost driver. This time, I was wondering about making a pulsing driver. It can be based on a simple LM317 current regulator, I'm just not sure how to go about pulsing the output. Can a 555 timer be used for this? I'm not even sure on which frequency to use. Something with an adjustable frequency from slow (strobe-like) to fast (not visible with the eye, unless one uses large sweeping motions) would be VERY cool.

Ideas?


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Old 06-19-2008, 09:44 AM #2
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Default Re: Pulsed driver ideas

It's a good idea, it does of corse open up the possibility of running diodes at 300mW or such without worrying about burning it out.
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Old 06-19-2008, 12:45 PM #3
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Default Re: Pulsed driver ideas

I would use a microcontroller and a FET. simply because its easier
but if analogue is your thing...
if you use a 555 also have a schmitt trigger to drive the fet, because you want to drive it with a square wave, not whatever comes out of a 555...
just hook up the fet between the driver and the battery.

search the net for 'adjustable frequency strobe 555' or something
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Old 06-19-2008, 12:45 PM #4
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Default Re: Pulsed driver ideas

I can draw you up the pulsing circuit if you want, and you can build it then attach it to a LM317 driver, You'll need to wait till I get home though.

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Old 06-19-2008, 03:59 PM #5
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Default Re: Pulsed driver ideas

heres that pulsing circuit, it should work, if you use a small resistor with a low resistance and capacitor thats small 200uF or less, it should pulse fastest.

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Attached Thumbnails
Pulsed driver ideas-pulsingcircuit.jpg  
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Old 06-19-2008, 04:29 PM #6
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Default Re: Pulsed driver ideas

Dude, this has actually been tried and isn't that far back in this very section. *We had about 3-4 people building individual pulsed drivers with 555 timers. *I'll see if I can find it.

http://www.laserpointerforums.com/fo...m=1187540489/0
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Old 06-19-2008, 04:46 PM #7
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Default Re: Pulsed driver ideas

DOnt know much about capaciters, only had a day or two on it in my physics class, but could you build a pulsed unit by using a capacitor? The charge would build up, be released, pulse the laser, and another would be building at the same time...
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Old 06-19-2008, 04:48 PM #8
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Default Re: Pulsed driver ideas

If you use that pulsing circuit I drew up and connect it to an LM317driver that will work, just need the right components at the right votlages .

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Old 06-19-2008, 05:11 PM #9
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Default Re: Pulsed driver ideas

As woop said it would be best to use a micro controller because its easier, you can program it to how many pulses per second. i think 30 pulses per second would be good enough?
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Old 06-20-2008, 02:59 AM #10
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Default Re: Pulsed driver ideas

you could look into the picaxe, it is programmable in basic. it even has a PWM command. (its like a basic stamp but all in one chip, and cheaper)
you could have 2 pots connected to its ADC ports to control the freq and on/off times

otherwise here is a circuit for adjustable frequency
http://www.tkk.fi/Misc/Electronics/c...bocontrol.html
I made it last night. it seems to work from &gt;1Hz to above 20kHz by adjusting the resistor (I hooked up a speaker, it went above my hearing range)
to simplify that circuit, get rid of the Vreg and run it off a 9V battery, the output circuitry is not really required, just put a resistor in series with the base of a power transistor, that can switch your LD + driver on and off
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Old 06-20-2008, 09:30 AM #11
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Default Re: Pulsed driver ideas

awesome! good work, guys.

So, details on this microcontroller setup?
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Old 06-20-2008, 01:21 PM #12
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Default Re: Pulsed driver ideas

ah screw it just use the 555 in that circuit i linked to. its simple, and it does what you want.

here is some good info on setting up a 555 and how to play around with duty cycle and freq
http://www.kpsec.freeuk.com/555timer.htm#astable
its always fun playing around with analogue circuits anyway. who knows you might learn something
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