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DhrBaksteen / ArduinoOPL2

Arduino library for use with the OPL2 board (YM3812) and OPL3Duo (YMF262)
MIT License
198 stars 39 forks source link

terrible noise #12

Closed romeurolo closed 6 years ago

romeurolo commented 6 years ago

hi mate, i receive the board and connected to my Chinese Arduino NANO clone, and Nothing. Some beers after i found that the problem is the wires not connected in the correct place. Now the board it's working but you can only hear some sound in the middle of the noise. My questions are: Chinese arduino sucks? My computer power switch sucks? I try to power up the board whit an external USB power switch, but the noise still remains. I will post some photos and audio file to show what im talk about. Thank for the Board, Romeu

romeurolo commented 6 years ago

wp_20180214_15_54_45_pro wp_20180214_15_54_54_pro wp_20180214_15_55_00_pro wp_20180214_15_55_05_pro

romeurolo commented 6 years ago

the link to the audio i record using my phone https://youtu.be/Ku73E8Qbxf0

DhrBaksteen commented 6 years ago

Hmm this puzzles me a bit.. I've heard it produce some strange noises while developing the board but not like this.

I take it that the pins on your breadboard with the Arduino are making a proper connection.

Let's see if we can diagnose it... Can you probe the board with an amplified speaker or headphones between a pin and GND while the demo tune sketch is running? You should get the following when probing: Pin 4 of IC2 - You should hear a distorted version of the tune Pin 2 of IC2 - You should hear the tune on low volume, less distorted Pin 1 of IC3 - You should hear the tune clearly but not very loud Pin 5 of IC4 - You should hear the tune regularly and volume can be adjusted with the pot

Another thing to try is what happens when you sweep the volume carefully? If there is a very narrow setting where the noise goes away and you can hear the music softly then it could be that you have a broken capacitor.

romeurolo commented 6 years ago

I try and the result are: Pin 4 of IC2 - Distorted version of the tune Pin 2 of IC2 - I can't hear nothing Pin 1 of IC3 - I hear the tune on low volume, less distorted Pin 5 of IC4 - I hear the tune low whit background noise

In the pot i try several times what you told me to do but the noise still remains.

DhrBaksteen commented 6 years ago

I'm trying a few things here, but so far it looks like a damaged amplifier

DhrBaksteen commented 6 years ago

Can you please measure if you have a short between pins 5 and 6 of IC4?

romeurolo commented 6 years ago

Hi, i change all the Ic's, made a nice 5 volts power supply and the noise remains. And that left me whit 2 problems, some passive component damage or the Chinese Duino sucks....

cbmeeks commented 6 years ago

Do you have a genuine Nano/UNO to test?

romeurolo commented 6 years ago

Not at this moment, but i have order some arduinos. I have to wait until they arrive.

DhrBaksteen commented 6 years ago

I would be surprised if it's due to the Arduino. The other circuitry on your board is not interfering with het Arduino?

vincentbernat commented 6 years ago

@romeurolo I have been used an Arduino Nano similar to yours without any issue (and with no additional components, just powered by USB).

DhrBaksteen commented 6 years ago

Closing this issue due to inactivity.

ashermja commented 4 years ago

Hi @DhrBaksteen, love the board but I'm having some problems with a large amount interference. I have a pre made board. I think it could be a capacitor issue as there is a narrow volume setting where most of the noise goes away.

DhrBaksteen commented 4 years ago

Can you provide a sample of the noise? Usually that diagnoses the problem quite quickly. One possible cause is that the power supply introduces unwanted noise.

ashermja commented 4 years ago

Thanks for getting back to me. I've tried quite a few different power supplies to see if it makes any difference, but all were the same.

https://www.dropbox.com/l/scl/AABzNk0U9ULBcg5PE0voerGhlTv5gyqmbpc https://www.dropbox.com/l/scl/AADj3ODCuLbxYI0jT9jStafam5K0Bt1fHm4

DhrBaksteen commented 4 years ago

I wasn't able to access the files unfortunately. They were private to you.

In the mean time to rule out the LM386 you can try by removing the chip from its socket hooking up some externally amplified speakers between the pins 3 and 4.

DhrBaksteen commented 4 years ago

Thanks for getting me access. It sounds as if the filter is having some issues and likely this is indeed one of the caps. Can you try the above and let me know? I will get back to you later today

ashermja commented 4 years ago

Just tried removing the LM386 same and testing pins 3 and 4, same interference.

DhrBaksteen commented 4 years ago

Ok, then I suspect that C1 is causing some issues.

Can you check one last thing? Try to reseat the ICs 2 and 3. And can you check that on the bottom of your board non of the pins are bent so that they are touching?

ashermja commented 4 years ago

Tried reseating IC 2 and 3 and still the same problem. The bottom of the board looks fine, nothing is is touching or bent. So I guess it's C1?

DhrBaksteen commented 4 years ago

That is probably this issue indeed. Can you send me a message on Tindie? Then let's get this resolved! :)

ashermja commented 4 years ago

Great, thanks