Lundahl
I read your post before. Thanks. It is interesting to read a report that likes the sound of the transformers better than the opamps. Lundahl makes so many models it hard to know them all. The spec sheet of the LL1636 shows that it was measured at -10dbu which should be just enough for most amps.
Size
It looks like the physical size, weight, and -10dbu output are speced the same for the 9206 and 1636.
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http://www.lundahl.se/pdfs/datash/1636.pdf
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http://www.lundahl.se/pdfs/datash/9206.pdf
It looks like the physical size, weight, and -10dbu output are speced the same for the 9206 and 1636.
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http://www.lundahl.se/pdfs/datash/1636.pdf
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http://www.lundahl.se/pdfs/datash/9206.pdf
I may be wrong (I don't know anything about transformers theory), but reading the pdfs here, they seems quite similar in size and specs :
http://www.lundahl.se/pdfs/datash/9206.pdf
http://www.lundahl.se/pdfs/datash/1636.pdf
And various comments on the internet discribing 1636 as double shielded 9206. (but they may be wrong too)
But, anyway, I would chose LL1636 over LL9206, we both agree on that
Edit : sendler was faster...
Holding the input below .1V would be around 25 ohms so wiring it 1/16 and using 6.4k on the output would give you around 0.5Vrms. I guess it could work if it doesn't saturate at low frequencies.
I may be wrong (I don't know anything about transformers theory), but reading the pdfs here, they seems quite similar in size and specs :
http://www.lundahl.se/pdfs/datash/9206.pdf
http://www.lundahl.se/pdfs/datash/1636.pdf
And various comments on the internet discribing 1636 as double shielded 9206. (but they may be wrong too)
But, anyway, I would chose LL1636 over LL9206, we both agree on that
Edit : sendler was faster...
My apologies, you are correct. I misread the specs.
Primary
I was just thinking about your post in the other thread and wondered if you might get a little better bass extension by changing the load to the primary with four resistors. And then possibly turning the amps up near the maximum and selecting the smallest resistors to give enough listening level plus some head room.
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I was just thinking about your post in the other thread and wondered if you might get a little better bass extension by changing the load to the primary with four resistors. And then possibly turning the amps up near the maximum and selecting the smallest resistors to give enough listening level plus some head room.
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Well, I struggled a lot to solder everything together (I'm a beginner in DIY, and not that good with solder iron...)
I don't think I'll try anything new on this particular board... It works and I want it to stay so.
Better is the enemy of good sometimes.
(I already destroyed my previous DAC...)
But feel free to experiment, I'd be very interested!
paste flux
The best tip to help in any soldering job is to get some paste or liquid flux to put a dab on each piece to be soldered. It makes the solder jump onto the parts like magic which is handy when you have to hold one piece by hand. Like a piece of wire already tinned and hot and then just carry a dot of solder on the tip of the iron to touch the parts together.
Well, I struggled a lot to solder everything together (I'm a beginner in DIY, and not that good with solder iron...)
I don't think I'll try anything new on this particular board... It works and I want it to stay so.
Better is the enemy of good sometimes.
(I already destroyed my previous DAC...)
But feel free to experiment, I'd be very interested!
The best tip to help in any soldering job is to get some paste or liquid flux to put a dab on each piece to be soldered. It makes the solder jump onto the parts like magic which is handy when you have to hold one piece by hand. Like a piece of wire already tinned and hot and then just carry a dot of solder on the tip of the iron to touch the parts together.
Manual
It was posted a few pages back. Don't ask gigawork for it or he will ban you from further purchases.
It was posted a few pages back. Don't ask gigawork for it or he will ban you from further purchases.
24/96 usb to I2S converters
Here are a couple new 24/96 usb converters to compete with the HiFace. Buffered I2S standard?
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http://www.diyaudio.com/forums/pc-based/174953-new-24-96-usb-converters.html#post2325229
Here are a couple new 24/96 usb converters to compete with the HiFace. Buffered I2S standard?
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http://www.diyaudio.com/forums/pc-based/174953-new-24-96-usb-converters.html#post2325229
I have a couple questions (sorry, I haven't read all 330 pages of this thread yet).....
How do I know if the upsampling is working or not? Shouldn't I be able to set the CS4398 to the quad speed setting with the upsampling board in place? It only works at single speed.
Is there a diagram on how to wire a switch for input selection?
I see I have a lot of reading to do.
How do I know if the upsampling is working or not? Shouldn't I be able to set the CS4398 to the quad speed setting with the upsampling board in place? It only works at single speed.
Is there a diagram on how to wire a switch for input selection?
I see I have a lot of reading to do.
LL1550 for I/V
For transformer I/V with the PCM1794a in mono mode, the LL1550 is listed as handling higher levels than the LL1678 or LL9926 even though they are the same size and should make it to a good 0dbu output? Primary resistances are a bit high though which may generate quite a bit of voltage on their own creating the need for manual trimming of the shunt resistors depending on tolerance differences. The multiple input windings can give each leg in mono mode it's own winding to eliminate the possibility of offset currents while still providing a center tap and the 1:4 gain in the resulting connection scheme "C", should develop a 0dbu output with (35 ohms for the coils approx plus parallel 46 ohm resistors) 20 ohm totals for the shunts which is getting down to the point where the chips will sound really good. I think I can reconfigure the blank 1798 modules to stack one above the other in mono mode with 1794a fitted and also hope to mod the +- 12v rails since I won't need any opamps to supply separately regulated +5v supplies for analog left and right while using the original analog 5v for a dedicated Vcom.
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http://www.lundahl.se/pdfs/datash/1550.pdf
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For transformer I/V with the PCM1794a in mono mode, the LL1550 is listed as handling higher levels than the LL1678 or LL9926 even though they are the same size and should make it to a good 0dbu output? Primary resistances are a bit high though which may generate quite a bit of voltage on their own creating the need for manual trimming of the shunt resistors depending on tolerance differences. The multiple input windings can give each leg in mono mode it's own winding to eliminate the possibility of offset currents while still providing a center tap and the 1:4 gain in the resulting connection scheme "C", should develop a 0dbu output with (35 ohms for the coils approx plus parallel 46 ohm resistors) 20 ohm totals for the shunts which is getting down to the point where the chips will sound really good. I think I can reconfigure the blank 1798 modules to stack one above the other in mono mode with 1794a fitted and also hope to mod the +- 12v rails since I won't need any opamps to supply separately regulated +5v supplies for analog left and right while using the original analog 5v for a dedicated Vcom.
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http://www.lundahl.se/pdfs/datash/1550.pdf
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LL7905
Or, I could quit being cheap and spring for a pair of LL7905 which would be ideal for PCM1794a in mono mode taking the required shunt resistance down to 12R/ leg and would easily handle the level with the lowest distortion. An expensive experiment if I don't like the 1794.
Or, I could quit being cheap and spring for a pair of LL7905 which would be ideal for PCM1794a in mono mode taking the required shunt resistance down to 12R/ leg and would easily handle the level with the lowest distortion. An expensive experiment if I don't like the 1794.
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I have a couple questions (sorry, I haven't read all 330 pages of this thread yet).....
How do I know if the upsampling is working or not? Shouldn't I be able to set the CS4398 to the quad speed setting with the upsampling board in place? It only works at single speed.
Is there a diagram on how to wire a switch for input selection?
I see I have a lot of reading to do.
Hurry up, what's taking you so long?
The input select matrix for the 8416 is just the 2 center pins taken either to ground or V. I used a 2 pole 4 position rotary switch, one pole for each jumper. That can give you a 4th input also if you add the hard wiring to the extra chip input pin.
AFAIK the upsampler will only work with quad speed, the switches are upside down. Look at post 3291.
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It seems like most of this thread is about audio transformers which I'm not really interested in at the moment.
Thanks, I think I have it sorted.
I'm still a bit confused with this part. My source is 48kHz and the CS4398 will only output sound if M3/M2 = 1/1 or M3/M2 = 1/0; it doesn't matter if the upsampling board is used or not.