speaker hiss
- ShowMaster
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Re: speaker hiss
The ring was interesting. I don't have any to try. I'll have to ask my ham friends. Local electronics surplus should have some.
Re: speaker hiss
I have a f-ring... didn't seem to do anything for me.jhsa wrote:What about the idea someone posted a while ago about using a ferrite ring?
João
Custom 9x with M64/Telemetry Mod
Re: speaker hiss
It will probably take you as much time to show me (in a diagram where that is) as to just doing it yourself.. but if you do, I will try it today, I have time to test that out... that is how much I want to solve this problemMikeB wrote:When I get a moment I'm going to try adding a 47pF capacitor across the (complimentary) inputs to the amp. This might roll off a bit of high frequency, but also suppress some noise pickup on the tracks between the processor and the amp.
Mike.
Custom 9x with M64/Telemetry Mod
- MikeB
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Re: speaker hiss
Not had time to look into adding that (yet), maybe tomorrow.
Mike.
Mike.
erskyTx/er9x developer
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- MikeB
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Re: speaker hiss
I tried a 47pF capacitor and I couldn't detect any improvement. It may not be a large enough value, the cutoff frequency may be as high as 26000 Hz. I'll see if I have something in the range 200 to 300pF to try.
Mike.
Mike.
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
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Re: speaker hiss
Thanks for the update... out of all my radios.. the original MegaSound sounds the best... but out of the other 2 Xtreme's the 4.7uF Cap does the trick, little quieter.. but very clear and no to less hiss. I hope your solutions works...
Custom 9x with M64/Telemetry Mod
Re: speaker hiss
Mike, do you have a picture where you are doing this?
Happy to test a few options for your... really want to help solve this... its really bothering me
Happy to test a few options for your... really want to help solve this... its really bothering me
Custom 9x with M64/Telemetry Mod
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Re: speaker hiss
Showmaster said -
[QUOTE]
In the olden days, before ... we added a parallel cap in series with a pot across the audio amp input ... We didn't boost the lows, but rather turned down the highs ... backache has kept me from bending over the bench work.
[END QUOTE]
Did you get a chance to try that yet?
What about 2 coils with opposing polarity causing the noise to cancel itself out without losing any of the frequencies? Aka, Humbucker Coils.
I think the "olden days" way you did things is still pertinent. All of the Sound Engineers and professionals with Degrees in Acoustics that I've bothered for information over the years trying to get the best out of my PA equipment always had one common piece of advice, anytime you go above flat, you have the capability of introducing noise. Roll-off/decrease other frequencies instead of boosting one.
[QUOTE]
In the olden days, before ... we added a parallel cap in series with a pot across the audio amp input ... We didn't boost the lows, but rather turned down the highs ... backache has kept me from bending over the bench work.
[END QUOTE]
Did you get a chance to try that yet?
What about 2 coils with opposing polarity causing the noise to cancel itself out without losing any of the frequencies? Aka, Humbucker Coils.
I think the "olden days" way you did things is still pertinent. All of the Sound Engineers and professionals with Degrees in Acoustics that I've bothered for information over the years trying to get the best out of my PA equipment always had one common piece of advice, anytime you go above flat, you have the capability of introducing noise. Roll-off/decrease other frequencies instead of boosting one.
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- MikeB
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Re: speaker hiss
Have a look at this:
I'm testing adding a capacitor between them. Since both signals at ths point coming through 130K resistors, if the capacitor value is large, it will block the audio altogether. That's why I started with 47pF.
I've just found a 560pF capacitor, so that will be my next attempt.
Mike.
I've marked two points in RED very near the bottom right corner, at the ends of two resistors.I'm testing adding a capacitor between them. Since both signals at ths point coming through 130K resistors, if the capacitor value is large, it will block the audio altogether. That's why I started with 47pF.
I've just found a 560pF capacitor, so that will be my next attempt.
Mike.
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
The difficult we do immediately,
The impossible takes a little longer!
- bob195558
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Re: speaker hiss
Hi Mike,
The picture is only 6 kb and so not able to see where the marked two points in RED are.
This pic is 546 kb, could you use and make this pic ? Thanks!
Bob B.
The picture is only 6 kb and so not able to see where the marked two points in RED are.
This pic is 546 kb, could you use and make this pic ? Thanks!
Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
Re: speaker hiss
I think this is the place... from what I can see.
Thanks for the image... Thanks for the info.
Will test today....
Thanks for the image... Thanks for the info.
Will test today....
Custom 9x with M64/Telemetry Mod
- MikeB
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Re: speaker hiss
Yes, those are the correct two places.
Mike.
Mike.
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
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Re: speaker hiss
I tried a 220pf, 470pf, 1nf, 2.2nf so far...
It seems to introduce another sound...
The hum is prominent.
It seems to introduce another sound...
The hum is prominent.
Custom 9x with M64/Telemetry Mod
- MikeB
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Re: speaker hiss
During a bit of testing of adding a capacitor today, the tiny resistor (right one on the picture) failed so I had no audio output. I've replaced it with one from a prototype board for now and I'm back working again.
The interesting thing is with no resistor, there was no hiss/clicking (I have I2C enabled), even though the amplifier was still powered (class D so still driving the speaker). This, at least, indicates the noise is being introduced BEFORE the amplifier.
I was trying a capacitor from the right resistor to ground (560pF), but again, this is probably too low in value.
I'll see if I can try some other values, but don't want to break another resistor!
Mike.
The interesting thing is with no resistor, there was no hiss/clicking (I have I2C enabled), even though the amplifier was still powered (class D so still driving the speaker). This, at least, indicates the noise is being introduced BEFORE the amplifier.
I was trying a capacitor from the right resistor to ground (560pF), but again, this is probably too low in value.
I'll see if I can try some other values, but don't want to break another resistor!
Mike.
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
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Re: speaker hiss
I think 1000 of those resistors costs around a dollar
Re: speaker hiss
you're buying them cheap
João
João
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- bob195558
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Re: speaker hiss
Hi,
I just ran across this youtube-video (How to Upgrade Your Taranis Speaker!) and after doing the speaker upgrade for the Taranis-X9D,
the speaker hiss disappeared, and the sound amplification was greatly increased too.
Click here to view this youtube-video: (https://www.youtube.com/watch?v=JB0qbx96BI0).
Could this speaker fix the hiss in the 9Xtreme ?
Bob B.
I just ran across this youtube-video (How to Upgrade Your Taranis Speaker!) and after doing the speaker upgrade for the Taranis-X9D,
the speaker hiss disappeared, and the sound amplification was greatly increased too.
Click here to view this youtube-video: (https://www.youtube.com/watch?v=JB0qbx96BI0).
Could this speaker fix the hiss in the 9Xtreme ?
Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
Re: speaker hiss
For that speaker to fit the 9x one will have to cut the power switch board in half, right?
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2x - Turnigy 9X with 9xtreme board;
2x - Turnigy 9XRpro ;
Frsky Taranis & Taranis +;
Horus x10s;
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Radiomaster TX16S Max mark II.
2x - Turnigy 9XRpro ;
Frsky Taranis & Taranis +;
Horus x10s;
Horus x12s;
Radiomaster TX16S Max mark II.
- bob195558
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Re: speaker hiss
I think it will fit with little trouble as the 9x and Taranis cases are very similar in size.
Bob B.
Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
Re: speaker hiss
I really doubt it would fit without modification.
When I shopped for speakers... keep in mind there are hundreds of thousands of speakers out there... the field quickly narrowed given the constraints.
8 ohm (ok, that narrows it down to tens of thousands)
40mm or smaller (now we're down to about 5 thousand)
At least half a Watt (still 5 thousand)
No more than 5.5mm thick
Whoops... that last one brings us down to pretty much 4 or 5.
Not many are that thin. And certainly not the one shown in that video, which I would guess is closer to 25mm.
When I shopped for speakers... keep in mind there are hundreds of thousands of speakers out there... the field quickly narrowed given the constraints.
8 ohm (ok, that narrows it down to tens of thousands)
40mm or smaller (now we're down to about 5 thousand)
At least half a Watt (still 5 thousand)
No more than 5.5mm thick
Whoops... that last one brings us down to pretty much 4 or 5.
Not many are that thin. And certainly not the one shown in that video, which I would guess is closer to 25mm.
- bob195558
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Re: speaker hiss
I was thinking more toward, Can a different speaker fix the hiss ?
Bob B.
Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
Re: speaker hiss
No fix as of yet on the 9Xtreme Hissing Noise...?
Did anyone try the new speaker yet? Did it do the trick?
Did anyone try the new speaker yet? Did it do the trick?
Custom 9x with M64/Telemetry Mod
- ShowMaster
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Re: speaker hiss
I did try a larger 8 ohm speaker like I used for my Taranis upgrade but no change.
The concerned hiss as we're calling it, is still not heard on 2 9xt boards unless in a quiet room. Verified by many at my field and club meetings. Much lower than a buzzy Taranis if you don't move the antenna around.
I'm not saying live with it, just that when outside flying, where I use it the most, it disappears.
I have been laid up and also dealing with the holidays, but have more bench time now.
I did find the using a finger on the audio IC circuitry I could introduce a lot of hum from my CFL overhead bench lights. This tells me that the traces and gain circuits are maybe high enough impedance to pick up adjacent data noise floating around. Like Mike, I don't think this noise is generated in the actual IC amp circuit, but instead it's being picked up and amplified. And eq or degrading of the amp circuit itself is just trying to mask it. This in turn will degrade the audio quality.
The idea of out of phase input coils or hum buckers, or balanced inputs, does work, but usually for lower end frequency hum I'm thinking.
All thinking on my part, so far, I also believe it's not the amp, but the circuitry before it, and that could be more challenging.
I've tried to scope the source but so far haven't found a direct visible cause. My scope probe actually introduces issues.
I'm open to circuit places to look at and the technique to use to actually see the offending hiss over the ambient noise already there but not heard.
The concerned hiss as we're calling it, is still not heard on 2 9xt boards unless in a quiet room. Verified by many at my field and club meetings. Much lower than a buzzy Taranis if you don't move the antenna around.
I'm not saying live with it, just that when outside flying, where I use it the most, it disappears.
I have been laid up and also dealing with the holidays, but have more bench time now.
I did find the using a finger on the audio IC circuitry I could introduce a lot of hum from my CFL overhead bench lights. This tells me that the traces and gain circuits are maybe high enough impedance to pick up adjacent data noise floating around. Like Mike, I don't think this noise is generated in the actual IC amp circuit, but instead it's being picked up and amplified. And eq or degrading of the amp circuit itself is just trying to mask it. This in turn will degrade the audio quality.
The idea of out of phase input coils or hum buckers, or balanced inputs, does work, but usually for lower end frequency hum I'm thinking.
All thinking on my part, so far, I also believe it's not the amp, but the circuitry before it, and that could be more challenging.
I've tried to scope the source but so far haven't found a direct visible cause. My scope probe actually introduces issues.
I'm open to circuit places to look at and the technique to use to actually see the offending hiss over the ambient noise already there but not heard.
Re: speaker hiss
I personally think that if we could get the amp to shut down when not in use, that would satisfy most people. My understanding is that people are annoyed with it hissing when it is NOT talking, right?
Re: speaker hiss
Couldn't the amp shutting down and restarting again introduce other noises and also other issues like delay on the sound?
João
João
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Re: speaker hiss
Tis possible! Experimentation would be required. The whole speed-of-light thing has me optimistic, but I'm not sure by any means.
Re: speaker hiss
Hey... that also has me wondering. Is the hiss ONLY there when there's no voice output? I honestly can't hear the hiss unless I'm in a very quiet place (which has me concerned my hearing should be checked)... but even when I can hear it, it seems to "disappear" when a voice is spoken. My assumption was that it was being masked or simply that the louder voice made the hiss less noticeable. But is it possible that it is only hissing when there's no output? I guess what I'm getting at... can we generate an output that is less noticeable than the hiss?
Probably not. Just a thought.
Probably not. Just a thought.
- ShowMaster
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Re: speaker hiss
Thinking? Any gating of the amp input or power, could introduce a pop? Doesn't this audio IC have a standby mode? I can't remember it's device # but I think it has. Wife's away for a week so more bench time tomorrow.[emoji2] I'll miss her, but I'll just have to work on Rc projects 24/7.
Re: 9Xtreme speaker hiss
It has shutdown mode. I see it has a 36ms time to wake up. Is that enough to cause problems with audio?s_mack wrote:This is the IC: http://www.issi.com/WW/pdf/31AP2005.pdf