Yes. The thing get warm to the touch, rail volts is 15v regulated.
I settled for 1.52MHz since it got hot above 2MHz.
I settled for 1.52MHz since it got hot above 2MHz.
good job tekko
the voltage is a bit lower. 15v
but you can run it at 2mhz is cool.
tell us how about the sound at mhz 🙂
fumac
the voltage is a bit lower. 15v
but you can run it at 2mhz is cool.
tell us how about the sound at mhz 🙂
fumac
The amp sound reather good, i don´t have a speaker that would make the actual sound justice, so i need to get RMAA and install a M-Audio Audiophile USB soundcard on the laptop to get a line in, since the laptop soundcard doesent have one.
I also need to find my T106-2 cores to replace this crappy -26 material one.
I also need to find my T106-2 cores to replace this crappy -26 material one.
Great job, I'm really interested in these Mhz design as they really look simpler than hypex ones.
But what about performances? It's hard to find information about this technology.
But what about performances? It's hard to find information about this technology.
My amp is ****, i tried to measure it but IMD + Noise peaked @ over 24000%, however thd was only 0.06%.
The imd problem could be due to that the amp generates a tone on low freqs, yet im not sure if it comes from the preamp or the poweramp, or if its due to that i dont have af error feedback yet.
The imd problem could be due to that the amp generates a tone on low freqs, yet im not sure if it comes from the preamp or the poweramp, or if its due to that i dont have af error feedback yet.
Nice and small stuff! And seems to work well!
Do you have any schematics?
Does it includes an AF error feedback?
The only paper I found is
http://class-d.net/tech/
If you could give me some information on this 🙂
Thanks,
Nicolas
Do you have any schematics?
Does it includes an AF error feedback?
The only paper I found is
http://class-d.net/tech/
If you could give me some information on this 🙂
Thanks,
Nicolas
Hi Tekko!
what is advantage of 1..2 mHz carrier freq. amp compared with usual 300..400kHz carrier freq. amp?
or it's only "science" experiment 😉 ?
what is advantage of 1..2 mHz carrier freq. amp compared with usual 300..400kHz carrier freq. amp?
or it's only "science" experiment 😉 ?
Lum, that have to do with that the LM311P output is inverting, if i use a TC4421, then the inputs would be the same as fumac´s block diagram.
Bender.ru, the higher switching frequency allows for more accurate reproduction of higher part of the audio band, class-d.net explains this.
Bender.ru, the higher switching frequency allows for more accurate reproduction of higher part of the audio band, class-d.net explains this.
Hi, Bender,
I read Fumac's explenation here http://class-d.net/tech/ about the advantage of Mhz modulation. The loss (yellow triangle tip) seems can be applied if the system is forced clocked (triangle clocked).
Fumac, is this also applicable to self-oscillating classD? Isn't that in selfoscillating, it's self-adjusting towards errors?
I read Fumac's explenation here http://class-d.net/tech/ about the advantage of Mhz modulation. The loss (yellow triangle tip) seems can be applied if the system is forced clocked (triangle clocked).
Fumac, is this also applicable to self-oscillating classD? Isn't that in selfoscillating, it's self-adjusting towards errors?
lumanauw
You are correct to some degree. Saying that a higher frequency improves the high frequency reproduction needs to be proven, not just taken for a theoretical to practical translation.
Self oscillating amplifiers gets more loop gain the more it attenuates the switching ripple but at some point the propagation delay and switching nonlinearities will take over and cause more distortion. My experience is that going above 600kHz is difficult without generating very high levels of radiated emissions. Of course if one is only building for DIY it would be OK as long as the neighbours pace maker does not stop.
Saying that EMI decreases when the switching frequency is pushed above 1MHz is pure fantasy and based only on the assumption that if the residual decreases in amplitude the EMI decreases. If you switch twice as many times the radiated emissions double and if you want to use this higher frequency for improving the sound the DV/DT need to be shortened easily doubling the radiated noise again.
You are correct to some degree. Saying that a higher frequency improves the high frequency reproduction needs to be proven, not just taken for a theoretical to practical translation.
Self oscillating amplifiers gets more loop gain the more it attenuates the switching ripple but at some point the propagation delay and switching nonlinearities will take over and cause more distortion. My experience is that going above 600kHz is difficult without generating very high levels of radiated emissions. Of course if one is only building for DIY it would be OK as long as the neighbours pace maker does not stop.
Saying that EMI decreases when the switching frequency is pushed above 1MHz is pure fantasy and based only on the assumption that if the residual decreases in amplitude the EMI decreases. If you switch twice as many times the radiated emissions double and if you want to use this higher frequency for improving the sound the DV/DT need to be shortened easily doubling the radiated noise again.
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