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  1. You've got the polarity on the outputs wired as sinkers, not sourcers. The T2 outputs are PNP type. Your wiring would work if you had a -TR20, where the outputs are NPN type. Don't forget to connect power on the output connector as well. Hook it up like this for a -T2: If you've got 2K resistors that's fine - all you're trying to do is limit the current through the optocoupler. We use 2.2K resistors. If you want to go all OCD and calculate the current through the optocouplers go right ahead. You may not be happy with this setup, as the max frequency in the spec sheet on the -T2 is 500 Hz. I have put a scope on this and the waveform gets triangle shaped the faster you go and becomes unusable at about 1200 Hz. Your results may vary. The -TR20 board using the dedicated HSO NPN outputs is MUCH faster, with a maximum speed of 200 kHz. I've been down this road and the PNP outputs are horribly slow for a stepper. There are other models that have the NPN HSO outputs as well. Just not the -T2. Joe T.
    1 point
  2. Just for fun I wrote the program for the above.
    1 point
  3. I can just imagine an audiophile with the most expensive valve amps and super duper turntable sitting back with their $10K headphones on, listening time and again to Ding.wav, savouring every moment. 🎵 🎧 Kratmel, you've really hit the "I don't believe someone actually made this" jackpot this time. Is it from M$oft? cheers, Aus
    1 point
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