I had a similar problem with this despite it not happening day before. In my case I found that the input signal wires had come loose on that channel. Don't know why it did it, but resoldering my input wires on that channel fixed problem. (I have input wires temporarily soldered to larger caps which then attach to neg legs of the boards 1uF while I determine the final size of my input caps).
But just seen irrebeo reply and he has pointed out wrong values on your mod!
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If you still got blue ones as bootstrap on top you can try the red ones there, if same as on YJblue the blue ones there create some problems
In my case yes. I had a channel where the resistor starting smoking, and upon investigation the input connections had come loose on that channel. I resoldered and problem didn't come back.
BUT. In your case it looks like values wrong as irrebeo pointed out. 330pf.
Someone who shall remain nameless got me sucked into "yet another giant killer Class D amp" and all the madness that goes with it. I have spent all morning going in the wrong direction. You would think that I would have learnt my lesson with the "Sonic Impact" crowd around 2006 when I joined DIYA. Following that I got bitten by Gainclones and made several incarnations, C-Moy's, Pass Labs F2, B1, then a JLH 10w Class A and many other things in between.
I'm too old for all this now😀 I hung up my soldering iron long ago, but here I was wasting a whole morning when I could have been asleep or reading or daydreaming.
My own bootstraps are well and truly tied up and ready to take me out into the world. As for this amp, that's it. Input caps done, PS caps done, bootstrap tried and failed. It sounds good enough to me. Now....where am I going to use it?......Ahh yes that heavily laden shelf containing other languishing projects will just about take it......😀
Thanks to everyone who responded to my posts.
Rob.
I'm too old for all this now😀 I hung up my soldering iron long ago, but here I was wasting a whole morning when I could have been asleep or reading or daydreaming.
My own bootstraps are well and truly tied up and ready to take me out into the world. As for this amp, that's it. Input caps done, PS caps done, bootstrap tried and failed. It sounds good enough to me. Now....where am I going to use it?......Ahh yes that heavily laden shelf containing other languishing projects will just about take it......😀
Thanks to everyone who responded to my posts.
Rob.
"Bootstrap" snubber, 10 ohm / 330pF is added to signal output, the bootstrap capacitor 220nF is always there. Schematic is in WIKI. YJblue bootstraps may not function properly, but that has nothing to do with snubber. Two YJblue's may differ substantially, partswise, and then there are ampboards that look like YJblue but have a different pcb and also again different parts.
Guilty as charged...don't go giving up just yet Rob!
I have never considered you a quiter, however old you may be! 😉
Sent from my LG-D855 using Tapatalk
Irrebeo... I realise this is a dumb question to be asking at this point, but I am reading again....🙁 ....
Can you confirm the output modulation scheme (AD or BD) used by the 3116, and is it a closed or open loop system. And, is the circuit in the data sheet BTL or other????
I have read data sheets etc on the chip, and thought it was clear to me until my new reading which introduces many variations, and combinations into the class d output mix and thought best to clarify for certainty.
Cheers for help.
Oh... And is it fully differential or common mode etc???
Can you confirm the output modulation scheme (AD or BD) used by the 3116, and is it a closed or open loop system. And, is the circuit in the data sheet BTL or other????
I have read data sheets etc on the chip, and thought it was clear to me until my new reading which introduces many variations, and combinations into the class d output mix and thought best to clarify for certainty.
Cheers for help.
Oh... And is it fully differential or common mode etc???
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Your HSDZ blueboard has bottomside gnd plane directly connected to audio gnd only. Electrolytic and decoupling Lin side are through electrolytic to gnd plane. PSU inputside electrolytic is only component on PSU gnd directly and topsidetrace connects to decoupling and to vias under tpachip to bottomside gnd plane. Most of times this is different, entire gnd plane PSU gnd directly and connected to audio gnd somewhere. Maybe doctormord/abraxalito has insight on difference.
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Ahh, you say the nicest things (you're not buttering me up are you?).
I will be interested to see how you get on. Just don't use the SMD's on the underside of the board like some other numpty😀
Incidentally, if they are intended to go near the chip, they are physically too big😱
Me? Reading through your description I follow through the PSU/GND stuff looking at board.
GND plane bottomside is connected to audioinput gnd, PSU gnd is "seperated", connected to electrolytic one side only, then pcbtrace topside, decoupling one side connects there (10nF smd side) and then through vias to gnd plane. Ussually it is other way around or not "separated" at all.
Sorry isn't true at all, PSU gnd seems only connected to one side electrolytic and decoupling, not going to chip there ? PSU gnd seems entirely seperated. Need to look again, LOL
Sorry isn't true at all, PSU gnd seems only connected to one side electrolytic and decoupling, not going to chip there ? PSU gnd seems entirely seperated. Need to look again, LOL
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Well it works for me.
Here's one of the readings as to why I asked about modulations.....
" Intrinsic Distortion of a Fully Differential BD-Modulated Class-D Amplifier with Analog Feedback "
Stephen M. Cox, Jun Yu, Wang Ling Goh, and Meng Tong Tan
Here's one of the readings as to why I asked about modulations.....
" Intrinsic Distortion of a Fully Differential BD-Modulated Class-D Amplifier with Analog Feedback "
Stephen M. Cox, Jun Yu, Wang Ling Goh, and Meng Tong Tan