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  • Piotr of Poznan commented on jbumstead's instructable 13 Note MIDI Laser Harp3 months ago
    13 Note MIDI Laser Harp

    Thank you so much, Jon! *I WILL NOT* send the control signals to the power pins, promise! :D I was talking about the three pins marked on your image as "-/+5V signal input". On my board, I'd say identical to yours, those pins are marked as "-", "G", "+". While I have ground reference (like for example ground from power supply) which can be connected to the "G" pin, the output from the differential amp will provide me with just a single voltage, varying from, let's say, -8V to +8V, as referenced to the mentioned ground. So, I was only wondering about where to connect this voltage - to the "+" pin or to the "-" pin of the input. I understand that the only difference would be in inverted operation of the galvo: with volt...

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    Thank you so much, Jon! *I WILL NOT* send the control signals to the power pins, promise! :D I was talking about the three pins marked on your image as "-/+5V signal input". On my board, I'd say identical to yours, those pins are marked as "-", "G", "+". While I have ground reference (like for example ground from power supply) which can be connected to the "G" pin, the output from the differential amp will provide me with just a single voltage, varying from, let's say, -8V to +8V, as referenced to the mentioned ground. So, I was only wondering about where to connect this voltage - to the "+" pin or to the "-" pin of the input. I understand that the only difference would be in inverted operation of the galvo: with voltage connected to the "+" pin, the galvo will be working CW with increasing voltage, and with "-" pin - CCW. If so, do I have to connect the unused pin to the ground or leave it be?I will try different scenarios with the hope of not burning the board :) Edison would not invent a light bulb if he did not try and fail a hundred times, right? ;)Thanks a lot for the time devoted to your replies, I feel like I used my limit already :) Take care!

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  • Piotr of Poznan commented on jbumstead's instructable 13 Note MIDI Laser Harp3 months ago
    13 Note MIDI Laser Harp

    Oh, many thanks for your reply, Jon! I will be experimenting with the said amps once they're delivered. They seem very versatile and should solve my issues with proper galvo feeding - so thank you very much for your explanation, time devoted and for digging in the depths of your mind and your archives :) Also, for the enlightment about using the +/-15V from the galvo's power supply! So obvious...One thing bothers me, though. There are three pin inputs in galvos: +, - and GND. I understand that it's enough to connect GND from the differential amp and its output to let's say "+" input pin in galvo. Once it's powered with positive voltage, it should turn in one dirrection, while powered with negative voltage from the amp it should turn the opposite, am I right? The "-" ...

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    Oh, many thanks for your reply, Jon! I will be experimenting with the said amps once they're delivered. They seem very versatile and should solve my issues with proper galvo feeding - so thank you very much for your explanation, time devoted and for digging in the depths of your mind and your archives :) Also, for the enlightment about using the +/-15V from the galvo's power supply! So obvious...One thing bothers me, though. There are three pin inputs in galvos: +, - and GND. I understand that it's enough to connect GND from the differential amp and its output to let's say "+" input pin in galvo. Once it's powered with positive voltage, it should turn in one dirrection, while powered with negative voltage from the amp it should turn the opposite, am I right? The "-" input pin would be irrelevant to the galvo's movements and as such should be connected to GND as well or left unconnected?Once I finish the project, I will send you some pictures of the thing I built with your instructable as well as your personal help :)Thank you once again!

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