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Old 06-10-2009, 09:38 PM #1
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Default Question about TTL modulation, and about laser galvos.

First, I'd just like to thank anyone in advance for helping.

Okay, so first off, I'm wondering how exactly I'm supposed to power this module: http://o-like.com/b2b_cpinfo.asp?id=966.



I hooked it up to the 5V on an ATX Power Supply. I'm pretty sure the 5V was going to it and that the power supply was on, but I'll probably check right now with a DMM. Basically, I'm not sure exactly how TTL modulation works. I'm guessing it is used with the 2-pin adapter which I didn't plug anything into... but, does it need to be closed in order for the laser to turn on?

Second, I am thinking about trying this: http://www.youtube.com/watch?v=qCUiCs-aYNk, but I have a few questions. I just received these galvos: http://www.laserpic.com/Ebay/Z30%20galvos.pdf. So, in order to do this, how would the wiring work? I wire one keyboard's headphone output to the input signal section of one galvo's amp board, and the other keyboard's headphone output to the input signal section of the other galvo's amp board? If so, I'm a little confused. There are three wires for the input signal (black, red, and white). The manual says the black is ground, the red is +x/y signal and white is -x/y signal, but... what would that be in terms of the wires from the keyboard?


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Old 06-10-2009, 09:39 PM #2
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Also, I'm guessing I should first measure the voltage coming out of the keyboard, and increase the volume until it reaches a max of 5V?
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Old 06-11-2009, 03:39 AM #3
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I'm not too well versed with this kind of thing, so I'm not really sure what you're asking... Are you suggesting you're going to run 5v TTL signals from your MIDI keyboard or some other audio source?

No audio signal is ever going to reach a volt, you're going to need something like this to amplify your signal to 5v.

As for your power question, is the fan on your ATX power supply spinning? If not, it's probably not supplying any voltage. You'll need to short out pins 14 and 15 to turn on the power supply.

Hope this helps at least somewhat.
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Old 06-11-2009, 02:54 PM #4
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Umm... never mind, I broke the laser driver. I opened it to try fixing it, and I accidently shorted out this part which I think messed up this small transformer which was inside. So... I'm just going to use the O-like's CC driver.
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Old 06-11-2009, 04:55 PM #5
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For your future reference, the TTL signals go to the small white 2-pin plug. They are what controls the blanking, usually it's TTL low (0V) = laser off, and TTL high (5V) equals laser on. The power input to the driver goes to the larger red cords, but you must be careful to observe polarity.
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Old 06-11-2009, 06:45 PM #6
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Quote:
Originally Posted by ElektroFreak View Post
For your future reference, the TTL signals go to the small white 2-pin plug. They are what controls the blanking, usually it's TTL low (0V) = laser off, and TTL high (5V) equals laser on.
... and there should be a pullup resistor inside the driver so that if you leave the input not connected the laser is always ON. At least every driver with a TTL input I've seen works this way.
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Old 06-11-2009, 06:59 PM #7
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^Ordinarily, that would be built in at the factory, so the "end user" shouldn't have to worry about it..
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