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## How to Troubleshoot pedalSHIELD MEGA 1 year 5 months ago #1374

 Sonstwer OFFLINE New Member Posts: 12 Thank you received: 1 Karma: 1 Hi, i got some strong noise problem, i bought this Power Supply DC 500mA 1A 2A 220V www.amazon.de/gp/product/B01EWI95RY/ref=...00_s01?ie=UTF8&psc=1 that helped reduce the noise a little bit, but not enough i also turned the RV1 trimmer without any (strong) effect i will re-check every soldering tomorrow (or soon), is my chip set in right? are there other things i could have done wrong? do i have to (somehow) ground the pedal? Edit: the only thing i realize i did a bit differently was that i made the led much shorter (i thought it should be very close to the shield as well and only realized later) Last Edit: 1 year 5 months ago by Sonstwer. The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 1 year 5 months ago #1375

 Ray NOW ONLINE Moderator Posts: 687 Thank you received: 146 Karma: 40 Hi Sonstwer, the only thing i realize i did a bit differently was that i made the led much shorter (i thought it should be very close to the shield as well and only realized later)That won't be a problem, the LED legs length has no effect over the sonic performance. i bought this Power Supply DC 500mA 1A 2A 220V www.amazon.de/gp/product/B01EWI95RY/ref=...00_s01?ie=UTF8&psc=1Looks like a good power supply, as far as the Arduino MEGA is happy with it, the shield will be happy too. I have compared your board against mine and all seems to be in place. Have you tried just using the sinewave generator, that code should be pretty clean and it should not create much hiss noise. Could you describe the noise? is more like a hummmmm or like a noise hisssss. The Arduino MEGA is not the best piece of hi-fi but the sound quality should be at least as good as the one we have in the MEGA video in youtube, we did not apply any noise reduction. Sometimes ground loops could be a problem, try to connect the arduino DC power supply close to your amplifier mains connector (also disconnect it from the computer (no USB)) The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 1 year 5 months ago #1379

 Sonstwer OFFLINE New Member Posts: 12 Thank you received: 1 Karma: 1 Hi, Today I checked all soldering points again and repaired every single one of them that didn't look very nice. The power supply I used is crap I made a video comparison with a battery pack I got myself, not with the effects you proposed, but I'm not near my computer to change effects right now. The sound distortion is quite good to hear Which of the shields you have at electrosmash sounds best? Last Edit: 1 year 5 months ago by Sonstwer. The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 1 year 5 months ago #1380

 Sonstwer OFFLINE New Member Posts: 12 Thank you received: 1 Karma: 1 So, i was finally able to change the sinewave generator. i found a funny bug (or maybe an indicator that i indeed did something wrong when i build my shield) what do you say? The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 1 year 5 months ago #1382

 Ray NOW ONLINE Moderator Posts: 687 Thank you received: 146 Karma: 40 - In the first video, I can hear that the sound has improved with the 9V battery pack that you use. The power supply noise is maybe the biggest factor of noise in this project. The noise is still noticeable so I wonder if maybe the gain that you are using at the amp is a bit too high, there is no guitar signal to compare. I don't know if I am explaining myself clearly but if the amp gain is pretty high, it is "normal" to have some background noise as the general guitar level and noise will be playing over it. In terms of sound quality I think that the DUE shield sounds better, but just by a small margin, they are not completely different animals. - In the second video, the signal generator can be heard even with the effect disconnected, this can be fixed by software by addingspeed=0;after the sentence:digitalWrite(LED, LOW); // switch-off the LEDBasically, it will stop the signal generator when the effect is off. This again could be seen if the gain of the amp after the pedal is too high, although in theory the effect is completely disconnected due to the action of the 3PDT footswitch, a tiny portion of the signal could be coupling into the audio path through the switch and the amp could be amplifying it... Just in case... could you check (with a multimeter (if you have one)) that your 3PDT connects the pins like the image below?: The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 9 months 2 weeks ago #1628

 lreinhart OFFLINE New Member Retired Engineer Posts: 6 Thank you received: 1 Karma: 1 The buttons and switches all work. The OLED works. The Sin Wave program sounds nice. The value for the ADC is around 32704; that is close to max as I understand it. I will take a close look at the circuit board and components tomorrow, but if this sort of thing has been seen before it could save me time. The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 9 months 2 weeks ago #1629

 Ray NOW ONLINE Moderator Posts: 687 Thank you received: 146 Karma: 40 The value for the ADC is around 32704; that is close to max as I understand itwww.electrosmash.com/images/tech/pedalsh...d-mega-schematic.jpg with nothing connected to the pedal (just power) make sure that the op-amps pins 5,6 and 7 are around 2.1 to 2.5V approx. Also, check that the ADC A0 pin is around 2.1 to 2.5V The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 9 months 2 weeks ago #1632

 lreinhart OFFLINE New Member Retired Engineer Posts: 6 Thank you received: 1 Karma: 1 Fixed up some insufficient solder joints and found that using batteries is the only way to keep it quiet. I am using two 2500 mah lithium cells that produce 8.25 volts and there are no noise problems at all. I am not seeing a big difference between the effects on and off, but there is a difference. The sound is very clean though. I wonder if I need a higher voltage, the next cell would take me a bit over 12 volts fully charged. The bit cruncher, for example does nothing until I reduce the number to 9 then all off a sudden it gets real loud. I haven't done anything with the pot, it is still in the middle position. So far I like the Chorus and Vibrato the best. I will start messing with the programming soon. The administrator has disabled public write access.

## How to Troubleshoot pedalSHIELD MEGA 9 months 2 weeks ago #1633

 lreinhart OFFLINE New Member Retired Engineer Posts: 6 Thank you received: 1 Karma: 1 I adjusted the pot so the output is the same for both switch positions (pass through, effects) and I think the battery is fine. My favorite is still chorus and tremolo, but I will try each for awhile and make a multi with my favorites. I see the VUE meter in some pictures, but not in any of the published code. Does the Mega not have enough power to handle it? I like the Mega shield, it meets my expectations. The administrator has disabled public write access.
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