| Electronics > Beginners |
| Analog help: Splitting guitar signal and eliminating cross-talk |
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| Scott D:
--- Quote from: radiolistener on July 17, 2019, 10:02:32 am --- --- Quote from: Scott D on July 16, 2019, 02:25:15 pm ---I have designed and built an analog circuit that will be housed inside a guitar --- End quote --- that's fail, electronic components, especially capacitors will be affected by guitar vibrations and will make distortions. Some times ago Dave published a video, where oscilloscope shows terrible pulses when you knock on his body. The same thing will happens with your circuit inside guitar. So, if you're want to get best sound quality, you're needs to move your analog circuit far away from guitar. --- End quote --- How significant was the noise? and was it at any specific frequency? It didnt seem to be an issue or significantly measurable when I tested with just the guitar. |
| Audioguru again:
--- Quote from: radiolistener on July 17, 2019, 10:02:32 am --- Electronic components, especially capacitors will be affected by guitar vibrations and will make distortions. Some times ago Dave published a video, where oscilloscope shows terrible pulses when you knock on his body. The same thing will happens with your circuit inside guitar. So, if you're want to get best sound quality, you're needs to move your analog circuit far away from guitar. --- End quote --- A cheap ceramic capacitor is microphonic and does what you say. Audio circuits should use film, not ceramic coupling capacitors for low distortion. |
| Buriedcode:
--- Quote from: radiolistener on July 17, 2019, 10:02:32 am --- --- Quote from: Scott D on July 16, 2019, 02:25:15 pm ---I have designed and built an analog circuit that will be housed inside a guitar --- End quote --- that's fail, electronic components, especially capacitors will be affected by guitar vibrations and will make distortions. Some times ago Dave published a video, where oscilloscope shows terrible pulses when you knock on his body. The same thing will happens with your circuit inside guitar. So, if you're want to get best sound quality, you're needs to move your analog circuit far away from guitar. --- End quote --- Well that depends, but my response to that is - not really. There are plenty of examples of circuits inside guitars - active pickup preamps, buffers, onboard distortions (fuzz factory I believe has been built into some guitars) and I haven't heard any reports of these making distortions - except the fuzz factory where it is actually required. I wouldn't worry at all about it, if you have a very high gain amp in there, and it picks up vibrations, then there are ways to mitigate that. Also, "guitar" and "best sound quality" don't really go together, even the cleanest guitar amp has oodles of harmonic distortion. Into a HIFI amp guitar sounds pretty terrible. |
| Scott D:
Big believer in closing the loop - to that end, I can confirm that the problem was well identified and resolved by replacing the signal input resistor to 1Mohm. Thank you everyone helping out, and explaining it. :-+ |
| Audioguru again:
--- Quote from: Scott D on July 20, 2019, 04:33:29 pm ---Big believer in closing the loop - to that end, I can confirm that the problem was well identified and resolved by replacing the signal input resistor to 1Mohm. --- End quote --- Then the guitar pickup is no longer loaded down and the gain of the 1st opamp is only 1 instead of 1000. The 0.1uF input capacitor feeding the new 1M resistor value will pass earthquake frequencies down to 1.6Hz, the capacitor value can be changed to 0.01uF and still pass all audio frequencies. Use a film capacitor, not electrolytic and not ceramic. |
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