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Author Topic: Rapidly spinning laser to create one-lined image  (Read 1618 times)
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why can't it be mentioned in one or 2 sentences? Like this, "That won't work because X, Y, Z"
This won't work because a laser presents a varying impedance to the thing driving it and so a simple resistor will not be able to give it the constant current it needs.

ok, then I figure you would just use a transistor in between the laser driver and the laser diode. That way the driver always has power applied to it and the diode would just be rapidly swtched on/off. Would that work?
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I have used this exact circuit



to control a low-power 3V laser module (inset).
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Cool. Did you just use that circuit simply for powering it or did you use it to rapidly flip it on/off over and over?
« Last Edit: May 13, 2012, 03:08:06 pm by David82 » Logged

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It was in a blinking application of sorts, a "low" frequency with a narrow pulse "on" (low duty) - a great success.

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I have used this exact circuit

Interesting circuit. Did the laser module require any external current limiting?
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I got the modules from ebay, they have circuit boards already (you can sort of see it stuffed in in the picture up there).  So, all they need is a supply voltage.. and you can run around and be irritating.. or do something constructive.. as the spirit moves.
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and you can run around and be irritating.. or do something constructive.. as the spirit moves.

Bad day at the Pancake House?
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It was in a blinking application of sorts, a "low" frequency with a narrow pulse "on" (low duty) - a great success.


What was the actual reason why you couldn't you just use a digi out pin and the appropriate resistor to switch the laser on and off? What would've been the result if you tried to do it the way I just described?
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