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Topics - vinietje

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1
Other Hardware / Safety Hardware
« on: November 15, 2014, 11:24:39 am »
Hi,


I'm looking into building some safety hardware in my diy projector setup
- (pt-20k) galvo+amp
- pt-trust showcard (only for the ILDA interface)


i noticed there is some header on the driver, which may enable me to tap into the feedback circuit of the amp.


I'm hoping to sample this signal with a uC controller, to switch the laser whenever the mirror is sitting still at some point for X time.


Has someone got any experience/thoughts regarding diy safety circuitry?


I'm afraid at some point one of my galvo's or the pc-app will crash, and my beam will be still but on




2
DACs / Max.wav download
« on: July 27, 2014, 04:14:47 pm »
Hey guys,


I thought let's fix my setup once again, swapping out a shorted sound card, but obviously i need te re-calibrate the correction-amp's output.


I've search everywhere for the max.wav zip files.


Can somebody help me out locating them?

3
DACs / Remove switching power supply noise
« on: January 04, 2014, 10:31:55 am »
Hi all,

first of all, BIG thanks for the eleborate forums, help and other info regarding the world of DIY dacs!

I build my own laser in the first phase, ebay galvo's (20pps), and an RGB-brick with analog modulation + showcard. Works great, however as i found the stock figures boring, I build the sound-dac.

This is were the problems arises:
It works very nice (used the tl042 op-amps, 50k gain pots, and the negative voltage regulator + the 5v-> 12 +- converter. The only problem i have, is that It picks-up the noise of my mac-book power adapter. If the show is running, and i disconnect the power adapter, clear images, no pixalited lines between two non-intersecting shapes, but if I add it to charge my battery, it does render more lines than i care fore.

I added the 3 10uF caps (tantalum), added an additional one to the 5v->12v+- converter (also 10uF). But still it pickup noise. the signal doesn't strike me as an 50hz distortion (eu), though. And as my battery isn't great anymore, I rather run in dc-connected.

Anyone has an idea where to put more caps? I power the converter by taping into the test-points on the sound card, as I rather not add more electronics to the dac, like an external powered hub or similar.

any tips are very appreciated!

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