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TOPIC: Guide to troubleshoot pedalSHIELD.

Guide to troubleshoot pedalSHIELD. 4 years 6 months ago #295

  • stevemiller99
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Holy crap! We have a pedal!
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Guide to troubleshoot pedalSHIELD. 4 years 6 months ago #296

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Holy crap! We have a pedal!

Rechecked continuity and resoldered the power supply and op amps. Tried distortion sketch and noted that the switches worked but didn't see any real difference (other than the input and output were working). I loaded the octaver sketch and it worked as advertised!

JR, thank you for all your help. My next task is to look at the sketches and see why some work and some don't.
Last Edit: 4 years 6 months ago by stevemiller99. Reason: Post didn't post all of text
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Guide to troubleshoot pedalSHIELD. 4 years 2 months ago #338

  • Sazabi
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Hello!

One question about U1 (TL072) pin3 voltage: is 0.1V correct?
I have all other Vs correct except this one - it's ~1V and slowly drops to ~0.87V while measuring.
Also, I've tried to replace TL072 with another ones and still got same result.
The reason I'm asking is that my pedal doesn't work.
Sine gen works good, bypass works good, but fx sketch, i.e. reverb, doesn't work at all. I'm just getting amplified signal without any delay. And rotating pots doesn't help.
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Guide to troubleshoot pedalSHIELD. 4 years 2 months ago #339

  • Ray
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Hi, I have my pedalSHIELD powered through the USB and I get 0.16V in pin3 of U1.
It is weird that you get that voltage, specially if Pin1,2 and 5 are 1.65V approx.

- Check continuity in the input components to see that are all connected in the right way, i.e check that pin3 of U1 is connected to R3 and R3 connected to R2 and C1, etc...

- Could you upload a pic of your board (or just send it to This email address is being protected from spambots. You need JavaScript enabled to view it.)

- Check the RV1 is placed in a mid position.
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Guide to troubleshoot pedalSHIELD. 4 years 2 months ago #341

  • Sazabi
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To keep topic clean, sent pics to email.
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Guide to troubleshoot pedalSHIELD. 4 years 2 months ago #342

  • Ray
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Hi, just to share the info with the rest of the users the Sazabi's problem has been fixed.
Seems that the problem was a bad Chinese Arduino Due, so beware:

"Actually, I found faulty element - Arduino Due. Actually, it's chinaduino due. But it's only available at my side for a moment.
I took another board and it worked. Thou, U1 pin 3 voltage is still ~1V and drops while measuring to about 0.8V. But pedal works. I've tried only reverb yet and it sound amazing:)"
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Guide to troubleshoot pedalSHIELD. 3 years 3 months ago #524

Hello all, I recently built the pedal shield but only some stuff works. I tried to follow the guide and here is all I got.
I checked all the soldering for shorts and checked the polarities of the capacitors, they are all good. The diodes are placed correctly and the ICs too, there does not seem to be any shorts in the pad. I tried to check the voltages but I'm not sure where to place the black lead of the multi-meter, the sine wave generator works. I tried to upload the programs but my LED is very dim and the effects work sometimes. I tried the metronome it works but when I press the foot switch everything gets loud no matter how i change the volume potentiometer. I loaded the blink program and the LED lights up correctly. I'm thinking that I messed up the positions of the switches or a component is dead. Thanks in advance for any help!
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Guide to troubleshoot pedalSHIELD. 3 years 3 months ago #525

I found the ground pin,
+5v reads 4.56V
-5v redas -4.08
TC1044s:
pin1:4.57v
pin2: 2.66v
pin3: 0v
pin4: -1.667v
pin5: -4.12v
pin6:1.253v
pin7:2.62v
pin8:4.58v
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Guide to troubleshoot pedalSHIELD. 3 years 3 months ago #528

  • Ray
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Hi,

The power rails look good, you have +5 and +5V (or close enough)m maybe could you be a bit more clear about "some stuff works"...? seems that your output stage (signal generator) is fine.

Make sure that the LED works, check this:
www.electrosmash.com/forum/hardware-peda...p-please?lang=en#343

Maybe your input stage is not that fine, did you adjust the input potentiometer VR1? do you have clean signal when you push the foot-switch and disable the effect?
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Guide to troubleshoot pedalSHIELD. 2 years 3 months ago #962

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The most important part of the TC1044 is that it is able to generate +5V and -5V (or close to it).
If you have a noisy unit I would recommend to use a better power supply, it has a big impact in the audio, have a look at this:
www.electrosmash.com/forum/hardware-peda...powering-arduino-due
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