Вы планируете деактивировать реле защиты? Он закорачивает выход на GND, поэтому вы не слышите щелчки и удары при включении/выключении питания. Это может не быть проблемой, если ваш операционный усилитель имеет защиту от короткого замыкания на выходе.
due to the war in my country, I only have 4580, 4556 , 4562 and 6172 available. I'm not strong in materiel and I don't know if they have such protection. can you educate me on a possible buffer bypass ? someone wrote that it worsens the sound, right?
due to the war in my country, I only have 4580, 4556 , 4562 and 6172 available. I'm not strong in materiel and I don't know if they have such protection. can you educate me on a possible buffer bypass ? someone wrote that it worsens the sound, right?
Well, I have done some mods to one of my Single AK4497EQ DSD units, and was planning to remove the transistor buffer stage - but haven't done it yet (got busy with other projects).
It's possible that the transistor buffer may be able to supply more output current than some op-amps, so removing the buffer might limit your output current - and reduce the performance if you have a hard to drive set of headphones.
On the other hand - a high-current op-amp may be able to deliver more current than the transistors - using the op-amp to drive your headphones may provide better performance.
I can't remember what the part numbers are for the transistors, but it shouldn't be too hard to determine what their maximum current capability is.
It looks like the NJM4556A has the highest output current (±70-mA) of the op-amps you list - so that would be the one to compare to the transistor specs.
This is the buffer configuration of OPA 1622 that Ivan describes bellow.
I think this is only for people that want to experiment with electronics and with the player, because replacing the discrete transistors with this or any other opamp buffer, will require a major modification: all discrete components that are part of the discrete transistors circuit need to be lifted and if we think a bit about that and we see that Ivan didn't stop there, he replaced all the analog amplification. So if you start doing this, maybe you end up like his PCB.
I think this Matrix quote applies to the mods Ivan did:
After this, there is no turning back. You take the blue pill—the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill—you stay in Wonderland, and I show you how deep the rabbit hole goes.
I've configured 1622 as a buffer per your instructions, I also read the datasheet to get the pinout and all makes sense, but could you please take a look at my photos and see if I did it right?
Maybe the photos are useful with your instructions, so I post them here.
Top side with the "bridge 1-2 and 6-7" and "extra 22uF caps", I didn't had 22uF, so I used 10uF.
(I used zero ohm resistor bridge, but a wire or solder can do the same job)
Back side, here I replaced this two 1uF capacitors with 0.1uF, they are in parallel with the top side capacitors.
The buffer pins are:
I used another dip8 opamp layout to identify the dip8 PCB pins and the wire colors:
Not directly related to the DSD, but Zishan has released a new desktop DAC/Disc-Player/Bluetooth/Wifi, the “D1”. Looks like a high-end MD2 for $226 on AliExpress
Not directly related to the DSD, but Zishan has released a new desktop DAC/Disc-Player/Bluetooth/Wifi, the “D1”. Looks like a high-end MD2 for $226 on AliExpress
The screen is simply described as LCD and doesn’t appear to be a touch screen… The remote looks the same as the MD1/MD2 (simple) one.
The description talks about Rigelian (IOS) and Malp (Android) Apps support which I think is how you would manage the USB disc player feature (there are 3 USB ports on that thing, in addition to the USB-C Amanero DAC interface).
It also talks about supporting Airplay, DLNA (I assume renderers), and future support for NAA push (HQplayer?), Roon protocols, internet radio, and adding DTS output.
Seems very ambitious on the software side… which would make me nervous coming from Zishan !!!
The screen is simply described as LCD and doesn’t appear to be a touch screen… The remote looks the same as the MD1/MD2 (simple) one.
The description talks about Rigelian (IOS) and Malp (Android) Apps support which I think is how you would manage the USB disc player feature (there are 3 USB ports on that thing, in addition to the USB-C Amanero DAC interface).
It also talks about supporting Airplay, DLNA (I assume renderers), and future support for NAA push (HQplayer?), Roon protocols, internet radio, and adding DTS output.
Seems very ambitious on the software side… which would make me nervous coming from Zishan !!!
Hi,
Yes, I found the photo you want, not the best quality, but it shows the connections.
At the time I used 400 Ohms earbuds and didn't need a buffer, so this was only a test and I removed it.
If you decide to put it, don't make those long wires, just solder it in place with short wires.
I'm not sure whether there are any people who have connections to Zishan on this thread - but I do believe there may be some on the Walnut and Zishan (WaZe) Facebook groups.
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