Extremely compact en nice design! Please tell us more in detail.
It seems a clickable module for a multichannel system!?
It seems a clickable module for a multichannel system!?
Thank you!
Not necesserily for multichannel but I built it for experiment to replace TI BTL driver ICs in my D-class amd with GAN output stage.
(posted it here: https://www.diyaudio.com/community/...-dsp-bluetooth-aux.376006/page-2#post-7720371)
The module has 2 channels for differential PWM signal input (i.e. 1 BTL audio output), driver - PA29102 (now obsolete) and EPC2016C FETs, 4 layer board.
The schematic is attached.
I've tested it but did not perform any measurements yet.
Not necesserily for multichannel but I built it for experiment to replace TI BTL driver ICs in my D-class amd with GAN output stage.
(posted it here: https://www.diyaudio.com/community/...-dsp-bluetooth-aux.376006/page-2#post-7720371)
The module has 2 channels for differential PWM signal input (i.e. 1 BTL audio output), driver - PA29102 (now obsolete) and EPC2016C FETs, 4 layer board.
The schematic is attached.
I've tested it but did not perform any measurements yet.
Je confirme!
J'ai essayé sans, ce n'était pas glorieux... Etage d'entrée MA12070 HS, alors... Explosion de l'op1612 du dac... Problème d'oscillation ?
Maintenant c'est stable, après avoir ajouté MKS sur les entrées, aucune perte de qualité audible n'a été constatée.
Il s'agit d'une pile de 2 planches, Entoure et centre....
Les enceintes principales MA5532MS! en double mono tout en étant totalement symétriques.... Mon Denon commence déjà à trembler.....
Attachments
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There is DC on the inputs. That is why the coupling caps are needed. The OPA1612 didn’t like backfeed of DC 😉
Sorry....I messed up my post...
So after burning 2 MA1270 chips in direct coupling, and the 2 opa1612 of the dac... I added MKS in inputs...
2 stacked cards for the rear and center speakers.
2 Mono MA5332 cards for the main ones all powered by 3 AKM4493SEQ dacs and 6 channel XMOS chip....
Goodbye my DENON....
Here is a photo of the dac....It is more advanced now...it is the only photo on my phone...Vacation!
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You are a lucky guy that the MA12070 survived.Yes...it's by failing...that we learn.!!!
Cordialement, JP
With my Sparkos discrete opamps I had no problems with DC as they have a DC servo.
Anyway got MA5532 so no concern anymore.
A DC servo serves to adjust outputs of opamps with symmetric PSU to 0.00V DC regardless of temperature and/or component differences. A very good industrial opamp is adjusted/produced with a very low DC offset documented in the datasheet. DC offset is nasty in DC coupled devices as it will be amplified. Audio branded discrete opamps can certainly not be made that well (among other specifications) so a DC servo is then a necessity. An exception and not a feature or a quality item.
Connecting them DC coupled to an IC that always has an incorrectable 2.5V DC offset itself will make the servos of the opamps wanting to correct that to 0V. In other words: they’ll go crazy.
So one better not uses opamps with DC servos in such situations as they may produce a blacker than black background permanently.
MA5332MS typically has 0V DC offset +/-18 mV.
Connecting them DC coupled to an IC that always has an incorrectable 2.5V DC offset itself will make the servos of the opamps wanting to correct that to 0V. In other words: they’ll go crazy.
So one better not uses opamps with DC servos in such situations as they may produce a blacker than black background permanently.
MA5332MS typically has 0V DC offset +/-18 mV.
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Using MKS is better than having blown MA12070. They simply sound good/neutral contrary to “for audio” made stuff. They also sound way better than the ceramic caps on such boards. They are relatively small so all in all they are a worthwhile improvement for only a few Euro. Alltogether many would call them quality parts.
They also don’t need any advertising as they prove themselves. Some brands produce stuff to retrofit for believers. Such products need advertising.
They also don’t need any advertising as they prove themselves. Some brands produce stuff to retrofit for believers. Such products need advertising.
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DC servo or not...Now I'm wary....
The connecting cables could turn into inductance...AND generate evil
The MKS have not added any coloring. 👍
https://www.wima.de/en/our-product-range/metallized-capacitors/applications/
MKP is tecnically better at HF. But that is coupled with low impedance (voice coil) Not medium impedance like input stage of amp. So MKS is a good choice
MKP is tecnically better at HF. But that is coupled with low impedance (voice coil) Not medium impedance like input stage of amp. So MKS is a good choice