It's all in the short Painkiller thread and that's why I advise it as a reading from a long time now in this thread as it was made for the AD1862.
from memory the circuitry is 19V with 3k or 3k.5 at the end I/V resistor. It's fine to increase the voltage more imo. There the amount of Z is arming less what you could beleive ! But if frightened by a big value for the noise, nothing should stop anybody to use, 3 x 1k smt resistor in serie à la Sussumu to make no longer than a bulk resistor!
I just changed for BC550/560C.
But I use it with 1K Rhopoint that I sent also to Painkiller which was happy with but ultimatly iirc bought after 1k5 of the same Rhopoint. So much less than the 2V, but noone matters with all the good actives preamp we have. Their volume pot work better most of the time at 12 hours positin, my experience and 'pinion. Though I'm towards Muse volume pot at the end of my dacs more and more.
I don't care of the 2V in my system, but sme may need it in their hifi.
Painkiller is a cool guy, not often here, but a gentleman, you can ask him, he has evolved with smt like EUVL.
from memory the circuitry is 19V with 3k or 3k.5 at the end I/V resistor. It's fine to increase the voltage more imo. There the amount of Z is arming less what you could beleive ! But if frightened by a big value for the noise, nothing should stop anybody to use, 3 x 1k smt resistor in serie à la Sussumu to make no longer than a bulk resistor!
I just changed for BC550/560C.
But I use it with 1K Rhopoint that I sent also to Painkiller which was happy with but ultimatly iirc bought after 1k5 of the same Rhopoint. So much less than the 2V, but noone matters with all the good actives preamp we have. Their volume pot work better most of the time at 12 hours positin, my experience and 'pinion. Though I'm towards Muse volume pot at the end of my dacs more and more.
I don't care of the 2V in my system, but sme may need it in their hifi.
Painkiller is a cool guy, not often here, but a gentleman, you can ask him, he has evolved with smt like EUVL.
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an analog plane stacked over a digital circuity usually is not seen as a good practice due to EMI issues. on the other hand the form factor would be the least factor to care about IMHO 🙄
Hi Fran. Its this board.....AK4118 based. One of the few I found that had optical input.
I also have a DIYINHK XMOS USB board to try which I could feed thru this as this 4118 has an input selector. However it isnt pin compatible which is a shame as that would have been a neat solution.
I also have a DIYINHK XMOS USB board to try which I could feed thru this as this 4118 has an input selector. However it isnt pin compatible which is a shame as that would have been a neat solution.
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Thanks for sharing your AK4118 board @jimk04, I found it on Taobao and may well give it a try. Looks interesting.
https://item.taobao.com/item.htm?spm=a230r.1.14.110.217e2879tiQYLk&id=520832497451&ns=1&abbucket=20#detail
https://item.taobao.com/item.htm?spm=a230r.1.14.110.217e2879tiQYLk&id=520832497451&ns=1&abbucket=20#detail
jimk04 - can you confirm that it works OK with this DAC? I have a need for a S/PDIF receiver for this build, and I tried an old WM8805 one, but couldn't get it working. I haven't had time to chase down the reason, but if your's works well, then its a nice unit to try. It has optical as well, which might suit too.
@jimk04
I have the similar AK4118 board version that also has an AK4137 on it. Found that MCU noise on power rail was jittering some of the other stuff. Put the AK4137, and eventually the LXH241, on clean power provided by a small TPS7A470x board mounted on the back of the AK4118 ground plane. Also, imported an external master clock. The mods individually and together helped improve SQ. Didn't test AK4118 to see if clean power was needed by it too.
I have the similar AK4118 board version that also has an AK4137 on it. Found that MCU noise on power rail was jittering some of the other stuff. Put the AK4137, and eventually the LXH241, on clean power provided by a small TPS7A470x board mounted on the back of the AK4118 ground plane. Also, imported an external master clock. The mods individually and together helped improve SQ. Didn't test AK4118 to see if clean power was needed by it too.
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Thanks Mark. Indeed having read a lot of the long ES9038 thread and seeing you use that 4118/4137 board led me to choose this one....not needing any upsampling. I have some decent psus for now but will see if I can suss out the power to the 4118 and maybe isolate that.
If you use copper for the spidf, try to make it short with true matched ohms plugs with the cable (TV cable), it improves things a lot. Id optical is chosen, which is fine because of the galvanic isolation, sometimes the led system can add noise if not sota... trade offs. Best is to choose a system that has both 🙂 and try both if your source has the two outputs.
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Thanks for that. I am pretty much all optical. I must look into the LED you mention. This is the red light we see coming out of the cable?
Do a busy evening and we have sounds. Really Jerry rigged for now but the 4118 fed from my TV as a test at the moment and my wife is watching Mary Berry thru the AD1862!
Initially the 4118 was set to I2S 24 and it had low output. I assumed this was just the output resistors I had chosen. Then I switched the 4118 to Left Justified and the level went up and maybe sounds better. Where 'should 'this be set for the AD1862?
But confirmed the 4118 spdif works with our DACs! And I've seen it for £26 with free delivery
Do a busy evening and we have sounds. Really Jerry rigged for now but the 4118 fed from my TV as a test at the moment and my wife is watching Mary Berry thru the AD1862!
Initially the 4118 was set to I2S 24 and it had low output. I assumed this was just the output resistors I had chosen. Then I switched the 4118 to Left Justified and the level went up and maybe sounds better. Where 'should 'this be set for the AD1862?
But confirmed the 4118 spdif works with our DACs! And I've seen it for £26 with free delivery
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more the system around to feed it, but there is also some improvements made on that technology with the leds themselves : read the end of the long ECDESIGN TDA1541 thread and what MaxLorenz did diy.
Does that AK chip has an external crystal to give an asynch I2S signals at the outputt as the Wolfson can ?
Does that AK chip has an external crystal to give an asynch I2S signals at the outputt as the Wolfson can ?
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There are no crystals on my board. I thought a crystal was needed somewhere but apparently not! I'm learning fast!
Those are chips wit both modes I beleive : they can pass trough or works in asynch modes with a local crystal (which is better indeed as well as the USB boards : asynch always winns VS the timing from the PC or a bad Rpi)
As SPDIF receiver AK4118 does not use clock for async reclocking. It is only used for sample rate detection. Adding a clock does not improve performance.
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