You can use jumpers with male-female Dupont connectors to separate the Arduino from the theremin board.

# Open Theremin V3, volume oscillator not working

Hello -- I am along the same boat..

The LEDs, calibration sounds all work.. U2 and U3's Pin 7 is 500/460Khz. No problems there.

However, there is no sound coming when I approach it. Also, the Pitch calibration is strange. It seems to go from 0 to 0 Hz. What could be causing this? Many thanks, -t

PITCH CALIBRATION

Arudino Freq: 15977871.00

Pitch Set Frequency: 499992

Frequency tuning range: 0 to 0

VOLUME CALIBRATION

Volume Set Frequency: 460703

Frequency tuning range: 428951 to 487098

DAC value L: 0 Freq L: 31123

DAC value H: 4095 Freq H: -2449

DAC value L: 4095 Freq L: 47038

DAC value H: 3797 Freq H: 100836

DAC value L: 3797 Freq L: 100790

DAC value H: 4355 Freq H: 99178

DAC value L: 4355 Freq L: 99196

DAC value H: -26851 Freq H: 99916

DAC value L: -26851 Freq L: 99870

DAC value H: -23157 Freq H: 99718

DAC value L: -23157 Freq L: 99697

DAC value H: -24580 Freq H: 101204

DAC value L: -24580 Freq L: 101155

DAC value H: 5446 Freq H: 99654

DAC value L: 5446 Freq L: 99666

DAC value H: -10511 Freq H: 99875

DAC value L: -10511 Freq L: 99849

DAC value H: 12697 Freq H: 99263

DAC value L: 12697 Freq L: 99279

DAC value H: 22495 Freq H: 100009

DAC value L: 22495 Freq L: 99984

DAC value H: -9097 Freq H: 100491

DAC value L: -9097 Freq L: 100446

DAC value H: 9550 Freq H: 99688

DAC value L: 9550 Freq L: 99682

DAC value H: -28467 Freq H: 99188

DAC value L: -28467 Freq L: 99185

DAC value H: 13946 Freq H: 99882

DAC value L: 13946 Freq L: 99834

DAC value H: -16493 Freq H: 101052

DAC value L: -16493 Freq L: 101015

DAC value H: 31225 Freq H: 100186

DAC value L: 31225 Freq L: 100194

DAC value H: -24957 Freq H: 100763

DAC value L: -24957 Freq L: 100737

DAC value H: 22500 Freq H: 99957

DAC value L: 22500 Freq L: 99971

DAC value H: -563 Freq H: 100651

DAC value L: -563 Freq L: 100613

DAC value H: -19410 Freq H: 99555

DAC value L: -19410 Freq L: 99596

DAC value H: -23390 Freq H: 99648

DAC value L: -23390 Freq L: 99625

DAC value H: 1338 Freq H: 99725

DAC value L: 1338 Freq L: 99697

DAC value H: 6468 Freq H: 100173

DAC value L: 6468 Freq L: 100137

DAC value H: -24551 Freq H: 99106

DAC value L: -24551 Freq L: 99118

DAC value H: -20108 Freq H: 99315

DAC value L: -20108 Freq L: 99289

DAC value H: -31764 Freq H: 99609

DAC value L: -31764 Freq L: 99568

DAC value H: -7987 Freq H: 99225

DAC value L: -7987 Freq L: 99241

DAC value H: -15315 Freq H: 99645

DAC value L: -15315 Freq L: 99633

DAC value H: 22635 Freq H: 100093

DAC value L: 22635 Freq L: 100064

DAC value H: 30620 Freq H: 99985

DAC value L: 30620 Freq L: 99979

DAC value H: -21382 Freq H: 100515

DAC value L: -21382 Freq L: 100486

DAC value H: -3481 Freq H: 99375

DAC value L: -3481 Freq L: 99383

DAC value H: 24835 Freq H: 99250

DAC value L: 24835 Freq L: 99236

DAC value H: 3517 Freq H: 100706

DAC value L: 3517 Freq L: 100641

DAC value H: 22167 Freq H: 99840

DAC value L: 22167 Freq L: 99851

DAC value H: -12515 Freq H: 100908

DAC value L: -12515 Freq L: 100866

DAC value H: -8792 Freq H: 100614

DAC value L: -8792 Freq L: 100599

DAC value H: -29668 Freq H: 100428

DAC value L: -29668 Freq L: 100405

DAC value H: 30662 Freq H: 99955

DAC value L: 30662 Freq L: 99959

DAC value H: -11594 Freq H: 99419

DAC value L: -11594 Freq L: 99410

DAC value H: -9157 Freq H: 100488

DAC value L: -9157 Freq L: 100431

DAC value H: 25818 Freq H: 99640

DAC value L: 25818 Freq L: 99640

DAC value H: -32470 Freq H: 99234

DAC value L: -32470 Freq L: 99237

DAC value H: -30396 Freq H: 100170

DAC value L: -30396 Freq L: 100123

DAC value H: 9077 Freq H: 99493

DAC value L: 9077 Freq L: 99495

DAC value H: 23499 Freq H: 100434

DAC value L: 23499 Freq L: 100386

DAC value H: -11728 Freq H: 99331

DAC value L: -11728 Freq L: 99350

DAC value H: 16069 Freq H: 100827

DAC value L: 16069 Freq L: 100775

DAC value H: -22163 Freq H: 100109

DAC value L: -22163 Freq L: 100112

DAC value H: -7598 Freq H: 99342

DAC value L: -7598 Freq L: 99336

DAC value H: -29031 Freq H: 100780

DAC value L: -29031 Freq L: 100715

DAC value H: -199 Freq H: 100879

DAC value L: -199 Freq L: 100837

DAC value H: -539 Freq H: 100605

DAC value L: -539 Freq L: 100606

DAC value H: -16905 Freq H: 100618

CALIBRATION COMPLETED

@tkalfaogluI think he good news is that your volume calibration is between the bounds. Looks like the capacitors there are working. I expect that he pitch pad currently is incomplete. Have you checked the oscillator?

Many thanks - I almost have it working! But the pitch is my problem.. How do I check the oscillator?

Hej Bernd,The DC voltage at U12 Pin 5 and 6, and both pins of R5, R6, L2 should be something about 2 ... 3V.We had similar Problems when I built up this theremin with a student. One problem was that she assembled the wrong capacitor. And as I remember, there was a short circuit directly from the volume antenna to GND of the PCB, because we've used a washer.Remove the volume antenna, screw and washer. Can you now measure a signal at U12 pin 6?It's not easy to measure the capacitance in the circuit. So I would suggest toto remove C8..C12. Double check the capacitors and then assemble only C8,C9 and C10. (Later on, if it works, the others)gerd

Sorry for my noobness but my schematics or parts list does not mention U12. Where do I find the elusive U12? My issue is the pitch, it doesn't work..

Thierry, you can do better than that. You can answer his question just about as easily as you can chastise him for not figuring it out himself. Or just ignore his question without comment.

It's no wonder newcomers take a peek at this forum and go running.

Sheesh...

Thierry, you can do better than that. You can answer his question just about as easily as you can chastise him for not figuring it out himself. Or just ignore his question without comment. It's no wonder newcomers take a peek at this forum and go running.Sheesh...

Thank you very much - I am unfortunately not as well versed as Thierry (desole) in electronics, so I am unable to figure out why the pitch is not working.

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