Not truely "random" #202
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Adding two videos of it working. In this one with it in the unlocked position you can see if always hit the same voltages https://youtube.com/shorts/sOzEx5lxdU0?feature=share a video of it with a "scope" view |
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posted pictures here of the build https://modwiggler.com/forum/viewtopic.php?p=3995928#p3995928 |
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bump |
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The pictures look OK, was this built from a Thonk kit? One think to try would be to swap the two 4015 shift register chips and see if the behaviour changes |
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I am pretty sure its a thonk build. I picked it up second hand. It was working as expected before shipping. I swapped the two chips and the behavior stayed the same. |
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Hi Rafael,
I think you should return it and get a refund or insist that the seller
repairs it for you.
Regards
Steve
Thonk
…On Fri, Jul 14, 2023 at 2:03 PM Rafael Azevedo ***@***.***> wrote:
I am pretty sure its a thonk build. I picked it up second hand. It was
working as expected before shipping. I swapped the two chips and the
behavior stayed the same.
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Ya I worked out a deal with the seller already. Just trying to see if I can troubleshoot whats up. I ordered new IC chips if those don't work I'll just do a new build haha |
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Ok glad to hear that, there are some sellers who seem to think a buyer
should inherit their build problems :)
…On Fri, Jul 14, 2023 at 3:17 PM Rafael Azevedo ***@***.***> wrote:
Ya I worked out a deal with the seller already. Just trying to see if I
can troubleshoot whats up. I ordered new IC chips if those don't work I'll
just do a new build haha
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Any other recommendations on troubleshooting before I give up. I've replaced all the ICs outside of the DAC and the noise trimer pot and its still exhibiting the same behavior |
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Seems I have isolated the issue. The voltage out is not matching the bits in the shift register. If I understand correctly they should be multiples of 0.033v but I am getting 0.3V with 1 bit in the first position video attached explaining |
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Maybe something wrong around the resistors in the op amp that scales the output? Maybe if R26 was 50k or 500k you'd see this behaviour? Just a guess, I've never seen this before, and it would only explain incorrect voltage output, not incorrect sequences of bits. |
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Yup looks like there was an incorrect resistor for R26 I replaced it and had to jump it to p1 of the TC074. Now I am getting a new behavior where sequences longer then 5 don't work as expected https://youtube.com/shorts/4pj9n4bUo6s?si=-Ana2UskU1RuRxdt |
I was able to calibrate the turing machine so the locking feature works. The issue I am having is that I always get a similar sequence a small ramp up from 0 in steps and then it holds the highest value set by the trim pot for a while and repeats. Now it does this randomly , but I never get step down or anything of that nature.
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