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Old 11-13-2011, 09:12 PM #273
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Default Re: Sound card DAC tutorial

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Originally Posted by arcaneinsomniac View Post
So there's no way to get fast analog current control without bleeding off extra power as heat? I guess standard methods to do it (buck circuit?) has inductances and properties which make it too slow to keep up?

So I got an email saying my order from Nautilus Integration has been cancelled. I guess DrLava doesn't have any more laserboy PCB's. I think my digikey order is in, though. I guess it's breadboard time.
The dimming circuits for many bucking topology circuits simply have a bypass transistor in parallel with the laser for PWM. It ends up using the same amount of power no matter what.

PWM is ultimately what you'd have to use to reduce the brightness without (much) heating. The problem is, of course, that you need a PWM base period that is far smaller than what you intend to have projected or you'll see those nasty dashes. At even a lowly 20kpps, you're looking at a very fast PWM.

Another thing to try would be using an acousto-optic modulator or something of that nature. It still may not be fast enough.


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Old 11-20-2011, 01:01 PM #274
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Default Re: Sound card DAC tutorial

Okay I got a breadboard X-Y correction amp built:



There is a pin header on the driver boards labeled +15 0V -15, it seems to be a +/- 15V supply but I have no need for them. What is this for?

Also, what exactly do I connect the input to the scanner? It takes 3 pins for input for each galvo. The SpaceLas PDF labels them +X -X 0V and +Y -Y 0V.

My correction amp has a ground and a single voltage output for X. Do I hook that up to +X? What goes to -X? is 0V the correction amp GND? Or is it -X?

I'm looking at ILDA spec now:

Quote:
X: Controls the horizontal beam position. This is a bipolar analogue signal whose voltage range is 10V peak-to-peak differential.
A differential voltage level of -10V shall deflect the laser beam to the left side of the projection area. A differential voltage level of +10V shall deflect the signal to the right side.
A differential voltage of +10V occurs if the normal signal line has a voltage level of +10V with respect to the voltage level of the inverted signal line. When compared to the ground level of the differential driver, the voltage level of the normal signal line shall be +5V and the voltage level of the inverted signal shall be -5V.
It seems to specify that the signal value is transmitted using a symmetrical differential signal where the voltage difference between the two opposite signals is between -10V and 10V and they are equally and oppositely changing from the 0V GND value.

This is not the signal being provided by the tuned correction amp, which (please please correct me if I am wrong) produces -10V for all the way to the left, and +10V for all the way to the right.

To satisfy ILDA I need a voltage that is in the middle to connect to the 0V pin...

My guess at this point is I skip the 0V pin and simply connect my correction amp's GND to -X, and the TL072 output for X to +X. Then I have a differential value which is the correct value.

Also I can't seem to find a link to download circle.wav.

Also, I cannot seem to get LFI to put out a waveform. I havent set up a sound card or anything yet but I should be able to hear something coming out of my headphones while playing an ILDA show but I'm getting nothing.

Edit: gonna start a new thread about LFI
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Last edited by arcaneinsomniac; 11-20-2011 at 02:03 PM.
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Old 11-25-2011, 03:56 PM #275
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Default Re: Sound card DAC tutorial

OP updated with important info on getting output from LFI Player.
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Old 11-27-2011, 07:51 PM #276
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Default Re: Sound card DAC tutorial

hey guys i downloaded the cmedia driver i see a folder for vista and xp anything for windows 7? thanks guys
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Old 11-27-2011, 07:56 PM #277
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Default Re: Sound card DAC tutorial

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Originally Posted by bennett326 View Post
hey guys i downloaded the cmedia driver i see a folder for vista and xp anything for windows 7? thanks guys
I think the Vista drivers work in Win 7 IIRC.
I actually just eneded up using Windows own drivers for the thing.
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Old 11-27-2011, 08:00 PM #278
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Default Re: Sound card DAC tutorial

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Originally Posted by Guyfromhe View Post
I think the Vista drivers work in Win 7 IIRC.
I actually just eneded up using Windows own drivers for the thing.
Thanks +1 for the quick help/reply
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Old 11-27-2011, 11:34 PM #279
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Default Re: Sound card DAC tutorial

Remember to set it up correctly in Windows 7 though. Otherwise you'll get some channel mixing.
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Old 11-27-2011, 11:37 PM #280
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Default Re: Sound card DAC tutorial

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Originally Posted by Bionic-Badger View Post
Remember to set it up correctly in Windows 7 though. Otherwise you'll get some channel mixing.
thanks i didn't see that thread before LOL

maybe cause the search bar ran away :cough: c0ld?
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Old 11-29-2011, 07:16 PM #281
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Default Re: Sound card DAC tutorial

Hey guys, I'm using the audiolase dac and soundcard. Wired everything up, connected the SC to my laptop, did what it's been suggested in this thread and in the other one for win7 users, but didn't get an output. I want to get this going on LFI. Any other tips that might help on getting output ? When I plug in the dac, there are 2 devices recognized. One is digital and the other says Speakers. I have really no idea what to do lol. All new to this.

Last edited by Elektrotechniker; 11-29-2011 at 07:21 PM.
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Old 11-29-2011, 07:21 PM #282
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Default Re: Sound card DAC tutorial

Quote:
Originally Posted by Silvershot View Post
Hey guys, I'm using the audiolase dac and soundcard. Wired everything up, connected the SC to my laptop, did what it's been suggested in this thread and in the other one for win7 users, but didn't get an output. I want to get this going on LFI. Any other tips that might help on getting output ?
The primary issue I had with LFI is you have to open the settings and check the "Laser On" checkbox and then it outputs sound. I believe ElektroFreak (OP) has updated the tutorial with this bit of info.

I was able to get my scanner running, though LFI does like to crash a bit. One of these days, once I get a setup to mount my scanner and optics and lasers I'll probably start working on a superior open-source software solution for quick&easy beamshows. Stay tuned.
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M-140 445nm@ 1800mA in L2X body (I have both a 2x18650 and 1x18650 L2X tubes that I drive with either 2x18650 or 2xIMR18350) with G2 LFL lens
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Mitsubishi "300mW" 638nm @ 775mA in Solarforce L2T Waterproof
A-140 445nm @ 1500mA flexdrive, Aixiz 445 lens in Solarforce L2P Waterproof thanks Jayrob
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Old 11-29-2011, 07:25 PM #283
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Default Re: Sound card DAC tutorial

Quote:
Originally Posted by arcaneinsomniac View Post
The primary issue I had with LFI is you have to open the settings and check the "Laser On" checkbox and then it outputs sound. I believe ElektroFreak (OP) has updated the tutorial with this bit of info.

I was able to get my scanner running, though LFI does like to crash a bit. One of these days, once I get a setup to mount my scanner and optics and lasers I'll probably start working on a superior open-source software solution for quick&easy beamshows. Stay tuned.
I did check the laser On option. Not sure what I'm missing. Do you remember chaning anything else? Are you on win7?

Last edited by Elektrotechniker; 11-29-2011 at 07:25 PM.
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Old 11-29-2011, 07:28 PM #284
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Default Re: Sound card DAC tutorial

Quote:
Originally Posted by Silvershot View Post
I did check the laser On option. Not sure what I'm missing. Do you remember chaning anything else? Are you on win7?
I am. Do you see any output coming from the LFI entry in your sound mixer thingy?
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M-140 445nm@ 1800mA in L2X body (I have both a 2x18650 and 1x18650 L2X tubes that I drive with either 2x18650 or 2xIMR18350) with G2 LFL lens
Mitsubishi "500mW" 638nm @ 1400mA in Solarforce P1D Grey, beautiful custom Copper heatsink in a waterproof configuration and with a G2 lens You have outdone yourself Flaminpyro!
M-140 445nm @ 1800mA Lazeerer X-Drive 2x14430 host thanks Ehgemus
Crooked 500mW O-Like Crown 532nm thanks Susie (but damnit, it's mounted crooked)
Mitsubishi "300mW" 638nm @ 775mA in Solarforce L2T Waterproof
A-140 445nm @ 1500mA flexdrive, Aixiz 445 lens in Solarforce L2P Waterproof thanks Jayrob
BDR-S06J @475mA L2P thanks Flaminpyro
LPC-826 in Aurora SH-032 Stainless @417mA
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Old 11-29-2011, 07:42 PM #285
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Default Re: Sound card DAC tutorial

Quote:
Originally Posted by arcaneinsomniac View Post
I am. Do you see any output coming from the LFI entry in your sound mixer thingy?
I do. On the volume mixer bottom right, there is volume on the digital device, indeed. Also you've got a PM

Last edited by Elektrotechniker; 11-29-2011 at 07:43 PM.
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Old 11-30-2011, 06:05 AM #286
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Default Re: Sound card DAC tutorial

Use the "Speakers" output; the digital version will output PCM which is not what you want. Also make sure that the speakers are set up for 7.1 surround sound with full-range as per the tutorial or else you'll get weird mixing.
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Old 11-30-2011, 08:40 AM #287
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Default Re: Sound card DAC tutorial

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Originally Posted by Bionic-Badger View Post
Use the "Speakers" output; the digital version will output PCM which is not what you want. Also make sure that the speakers are set up for 7.1 surround sound with full-range as per the tutorial or else you'll get weird mixing.
Hello,

I am also working on a soundcard dac. I have set the soundcard up correctly but I still get some channel mixing. I can hear a weak signal from the left channel onto the right channel (It's the same on all channels) Could it be a bad soundcard or is there something else wrong?
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Old 12-01-2011, 12:58 AM #288
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Default Re: Sound card DAC tutorial

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Originally Posted by laser15 View Post
Hello,

I am also working on a soundcard dac. I have set the soundcard up correctly but I still get some channel mixing. I can hear a weak signal from the left channel onto the right channel (It's the same on all channels) Could it be a bad soundcard or is there something else wrong?
Are you able to post or PM me pics of your DAC setup and screenshots of your audio card settings? Hardly anyone ever does that, but I'll ask anyway since they would be absolutely golden in terms of helping to diagnose problems.
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Last edited by ElektroFreak; 12-01-2011 at 12:58 AM.
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