All your videos are great, you're sharing a huge amount of experience here. Seeing a real design step by step, from concept, going through simulating separate parts, up to building and measuring, is not commonly seen . I hope you success in this channel so you can buy all the gear you need!
Sorry to be offtopic but does anybody know a tool to log back into an Instagram account?? I was dumb forgot my login password. I appreciate any assistance you can give me.
@Thatcher Sage I really appreciate your reply. I found the site thru google and I'm waiting for the hacking stuff atm. I see it takes a while so I will reply here later with my results.
I know that process about designing a classD amplifier can obtainable if you search enough on the internet, but also your videos are giving great ideas for seeing all the things together. Thanks again
I totally agree with you! Basically watching this video gave me more knowledge about the class-d amplifiers than some other google wiki page..! Great work!
THD+N is often measured after filtering the amplifier's output signal using an almost ideal brickwall filter with -60 dB damping at 24 kHz and higher. That is probably why your amplifier sounds much better than THD+N of 6% may expect.
Hi, I find it very interesting. Could you please upload the ClassD_Trans LTspice simulation of the previous video in the git repository? I d like to have a look at the transient simulations of the amplifier myself. Thank you.
Hi, first of all amazing work was done here! But I've a question about the XOR gate and the turn-on, turn-off and death time. I think I don't see how you implemented that? If I see correctly both, positive and negative bridges are switched at the same time? Looking forward in following your DSP projects with the STM... Regards, Ales Zupanc
so this is basically a push-pull amplifier correct? so would this be similar to a full bridge design? also is this similar to a class B amplifier? since there is a possibility of going fully active and not using any crossovers technically you could get away with a Class B topology or this class style amplifier pictures here without any crossover Distortion since you don't have to run any kind of standby or bias, current from what I can understand. @ 4:50 you are explaining amplifier feedback circuits at this point from what I can tell this basically gives the audio signal more linearity from what I can recall. (?) After that?? Way above my I.Q. Level.. :-)
Have you ever thought about using a fast MCU with an i2s ADC and modulating the output devices from the MCU directly(buffered with something like a totem-pole for example)? That way you can very finely tune deadtime for your output tansistors right before they will start to shoot-through. It will reduce distortions dramatically. But for that you will need a higher than the upper rail supply voltage for the gate of the upper transistor, which can be achieved using a charge pump, modulated from the same MCU, or using a floating 12 V supply, referenced to a mid-point, or a gate drive transformer(the latter is impractical due to many catches on how to properly discharge the gates but doable).
Yes I thought about modulation on a microcontroller. I‘m actually planning something in that direction also with feedback completely in digital domain. But not sure how to realize a good low-latency feedback path back into digital. My target is to realize on a TC375 microcontroller
@@YetAnotherElectronicsChannel try the open loop first, fine tune the parameters, measuring THD, and maybe you won't even need for analog feedback? Properly driving MOSFETs is another challange.
No, they are the worst, especially the X7R type. Not only the piezo electric effect can induce ringing if the amp is in the same room as speakers but also they will induce audible distortions with high level signals on it's own. Even at small signal levels X7R can induce distortions under -80 db that can be clearly measured with a simple setup like a soundcard with a loopback and a ceramic cap inside the loop. NP0 are noticeably better in terms of THD but are totally same for piezo effect. MKP film would be the best bet here.
![[#11] TDA7492 Amplifier Power & Stress Testing](http://i.ytimg.com/vi/KDLmVlIuHQE/mqdefault.jpg)
![[#11] TDA7492 Amplifier Power & Stress Testing](/img/tr.png)
![[#18] Full digital Class-D amplifier with FPGA (by using a multibit sigma-delta noiseshaper)](/img/n.gif)
All your videos are great, you're sharing a huge amount of experience here. Seeing a real design step by step, from concept, going through simulating separate parts, up to building and measuring, is not commonly seen . I hope you success in this channel so you can buy all the gear you need!
Sorry to be offtopic but does anybody know a tool to log back into an Instagram account??
I was dumb forgot my login password. I appreciate any assistance you can give me.
@Gatlin Arturo instablaster ;)
@Thatcher Sage I really appreciate your reply. I found the site thru google and I'm waiting for the hacking stuff atm.
I see it takes a while so I will reply here later with my results.
@Thatcher Sage It worked and I now got access to my account again. I am so happy:D
Thanks so much you really help me out :D
@Gatlin Arturo happy to help :)
I know that process about designing a classD amplifier can obtainable if you search enough on the internet, but also your videos are giving great ideas for seeing all the things together. Thanks again
I totally agree with you! Basically watching this video gave me more knowledge about the class-d amplifiers than some other google wiki page..! Great work!
Thanks for the quality content!
This is a master class! thank you for submitting it
THD+N is often measured after filtering the amplifier's output signal using an almost ideal brickwall filter with -60 dB damping at 24 kHz and higher. That is probably why your amplifier sounds much better than THD+N of 6% may expect.
Awesome contend! Thanks alot!
Hi, I find it very interesting. Could you please upload the ClassD_Trans LTspice simulation of the previous video in the git repository? I d like to have a look at the transient simulations of the amplifier myself. Thank you.
Hi,
first of all amazing work was done here!
But I've a question about the XOR gate and the turn-on, turn-off and death time.
I think I don't see how you implemented that? If I see correctly both, positive and negative bridges are switched at the same time?
Looking forward in following your DSP projects with the STM...
Regards,
Ales Zupanc
so this is basically a push-pull amplifier correct? so would this be similar to a full bridge design?
also is this similar to a class B amplifier?
since there is a possibility of going fully active and not using any crossovers technically you could get away with a Class B topology or this class style amplifier pictures here without any crossover Distortion since you don't have to run any kind of standby or bias, current from what I can understand.
@ 4:50 you are explaining amplifier feedback circuits at this point from what I can tell this basically gives the audio signal more linearity from what I can recall. (?)
After that?? Way above my I.Q. Level.. :-)
Which power amplifier is used for amplifying the sensor output followed by PID controller?
Wondering the same thing class H possibly??
Have you ever thought about using a fast MCU with an i2s ADC and modulating the output devices from the MCU directly(buffered with something like a totem-pole for example)? That way you can very finely tune deadtime for your output tansistors right before they will start to shoot-through. It will reduce distortions dramatically. But for that you will need a higher than the upper rail supply voltage for the gate of the upper transistor, which can be achieved using a charge pump, modulated from the same MCU, or using a floating 12 V supply, referenced to a mid-point, or a gate drive transformer(the latter is impractical due to many catches on how to properly discharge the gates but doable).
Yes I thought about modulation on a microcontroller. I‘m actually planning something in that direction also with feedback completely in digital domain. But not sure how to realize a good low-latency feedback path back into digital. My target is to realize on a TC375 microcontroller
@@YetAnotherElectronicsChannel try the open loop first, fine tune the parameters, measuring THD, and maybe you won't even need for analog feedback? Properly driving MOSFETs is another challange.
@@YetAnotherElectronicsChannel And drop ceramic caps in the filter. They may constitute some numbers to the THD figure, even chinese guys use film.
Ceramic caps are good for filtering?which makes audible noise due to its piezo electric effect. (may be am wrong)
No, they are the worst, especially the X7R type. Not only the piezo electric effect can induce ringing if the amp is in the same room as speakers but also they will induce audible distortions with high level signals on it's own. Even at small signal levels X7R can induce distortions under -80 db that can be clearly measured with a simple setup like a soundcard with a loopback and a ceramic cap inside the loop. NP0 are noticeably better in terms of THD but are totally same for piezo effect. MKP film would be the best bet here.