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Messages - gianpaolo
Pages: [1]
1
« on: June 22, 2021, 12:34:46 PM »
Yes I did, but no change with or without grounding. Did you try grounding the theremin? I built several opentheremins v3 but had no issues whatsoever, maybe Gaudi could help?
2
« on: June 22, 2021, 12:34:04 PM »
Thanks for the suggestions, will try. Unfortunately I don't have an oscilloscope. I will bet that there are others watching this post, just waiting for someone to jump in, so here goes: I am no expert about this device, (I have never even built one using semiconductors), but it appears to me that your problem is NOT one of calibration. Something is wrong with the circuit. Since it fails after it has been on for a while, it sounds like something could be heating up. A short somewhere? Maybe a capacitance is building up due to a missing parallel resistance? Maybe a defective capacitor or other component? Bad solder joint? Power supply issue? I'd start by measuring some stuff when it is "cold" and then again when it fails to see what has changed.
3
« on: June 13, 2021, 12:00:09 PM »
I built the OpenTheremin v3 from the kit provided by gaudi.ch but it is quite unstable. After the first calibration, it worked for some ten minutes, then the sound started to degradate till it did not work anymore. Further calibrations did not reach the working result. After hours, it worked again, but then few minutes later it degraded again. It's the same story each time, it works few minutes then not anymore. And further tentatives to let it calibrate, did not work.
Please can you help me?
I see from the logs that set frequencies are not always in the range, is that wrong? how can I fix it?
---
PITCH CALIBRATION
Arudino Freq: 15988545.00
Pitch Set Frequency: 499658 Frequency tuning range: 488401 to 526328
DAC value L: 0 Freq L: -11341 DAC value H: 4095 Freq H: 26677
DAC value L: 4095 Freq L: 26664 DAC value H: 1222 Freq H: -5021
DAC value L: 1222 Freq L: -5008 DAC value H: 1677 Freq H: 1790
DAC value L: 1677 Freq L: 1788 DAC value H: 1558 Freq H: 59
DAC value L: 1558 Freq L: 58 DAC value H: 1554 Freq H: 1
DAC value L: 1554 Freq L: 1 DAC value H: 1554 Freq H: 1
VOLUME CALIBRATION
Volume Set Frequency: 460395 Frequency tuning range: 455623 to 485872
DAC value L: 0 Freq L: -4781 DAC value H: 4095 Freq H: 25475
DAC value L: 4095 Freq L: 25451 DAC value H: 648 Freq H: -3158
DAC value L: 648 Freq L: -3155 DAC value H: 1028 Freq H: -2027
DAC value L: 1028 Freq L: -2046 DAC value H: 1710 Freq H: 815
DAC value L: 1710 Freq L: 802 DAC value H: 1516 Freq H: -220
DAC value L: 1516 Freq L: -236 DAC value H: 1557 Freq H: -24
DAC value L: 1557 Freq L: -23 DAC value H: 1561 Freq H: -3
DAC value L: 1561 Freq L: -13 DAC value H: 1561 Freq H: -3
CALIBRATION COMPLETED
PITCH CALIBRATION
Arudino Freq: 15988638.00
Pitch Set Frequency: 499655 Frequency tuning range: 482584 to 518827
DAC value L: 0 Freq L: -16912 DAC value H: 4095 Freq H: 19279
DAC value L: 4095 Freq L: 19265 DAC value H: 1914 Freq H: -670
DAC value L: 1914 Freq L: -691 DAC value H: 1987 Freq H: 100
DAC value L: 1987 Freq L: 157 DAC value H: 1978 Freq H: 97
DAC value L: 1978 Freq L: 103 DAC value H: 1964 Freq H: -97
DAC value L: 1964 Freq L: -260 DAC value H: 1970 Freq H: -202
DAC value L: 1970 Freq L: -131 DAC value H: 1990 Freq H: 213
DAC value L: 1990 Freq L: 234 DAC value H: 1978 Freq H: 95
DAC value L: 1978 Freq L: 102 DAC value H: 1970 Freq H: 8
DAC value L: 1970 Freq L: 2 DAC value H: 1970 Freq H: 9
VOLUME CALIBRATION
Volume Set Frequency: 460392 Frequency tuning range: 450529 to 479715
DAC value L: 0 Freq L: -9869 DAC value H: 4095 Freq H: 19359
DAC value L: 4095 Freq L: 19348 DAC value H: 1383 Freq H: -5963
DAC value L: 1383 Freq L: -5969 DAC value H: 2021 Freq H: -1010
DAC value L: 2021 Freq L: -1017 DAC value H: 2150 Freq H: 644
DAC value L: 2150 Freq L: 635 DAC value H: 2100 Freq H: 12
DAC value L: 2100 Freq L: -7 DAC value H: 2100 Freq H: 12
DAC value L: 2100 Freq L: 12 DAC value H: 2100 Freq H: 18
CALIBRATION COMPLETED
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