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DAC AD1862: Almost THT, I2S input, NOS, R-2R
DAC AD1862: Almost THT, I2S input, NOS, R-2R
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Old 5th August 2020, 09:06 AM   #671
diyiggy is offline diyiggy
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You joined diya for this project...great.
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Old Yesterday, 03:14 PM   #672
nano35 is offline nano35  Hong Kong
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Another DIYer here going for this Dac.
I am done populating my AD1862 PCB.
I have both Opa134 and Muse03 op amps in my toolbox so I will compare them.

One question:
I have a pair of Vintage 600:600 transformers; they are as big as WE111C. HUGE!
I wonder if they will work as passive I/V?
Need any resistors across the wiring?

For now I need to arrange all the parts in a case and drill holes....not easy!
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Old Yesterday, 06:18 PM   #673
miro1360 is offline miro1360  Europe
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nice work nano35
output impedance is 600R? if so, try add a 1k resistor parallel on the output, ... it is not very good transformer for the I/V ...
better look for transformer ratio 1:10 or 1:20 with low input impedance and higher output impedance (like input impedance 10R and output impedance 400R)
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Old Yesterday, 09:23 PM   #674
pistollero is offline pistollero  Portugal
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DAC AD1862: Almost THT, I2S input, NOS, R-2R
Hi all, i have been listenning to ad1862 all week and this chip sound very good.
Now i put 1k5 Vishay TX2575 on iv. I have that at home.
I m going to populate another board with elna simics and film bypass. Also need to test cog cap as well and other opamps.
Regarding c15/16/25/26. Should i use tantalum ?20200807_222039.jpg
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Old Yesterday, 09:44 PM   #675
Vunce is offline Vunce  United States
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Location: LI, NY
DAC AD1862: Almost THT, I2S input, NOS, R-2R
Hi Pistollero,

I have two working boards, one with Panasonic FR the other has AVX tantalums in C15/16/25/26 locations. Honestly, Id be lying if I said one was better or worse than the other. The Dac sounds excellent either way! Im curious about your TX2575 resistors. I used them in an AD1865 Dac and liked them. Texas Components make a surface mount version Im thinking of installing on my I/V boards.
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Old Today, 01:54 AM   #676
nano35 is offline nano35  Hong Kong
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Quote:
Originally Posted by miro1360 View Post
nice work nano35
output impedance is 600R? if so, try add a 1k resistor parallel on the output, ... it is not very good transformer for the I/V ...
better look for transformer ratio 1:10 or 1:20 with low input impedance and higher output impedance (like input impedance 10R and output impedance 400R)
Thanks Miro.
I will test it with op amp first.
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Old Today, 06:43 AM   #677
dewdrop is offline dewdrop  Singapore
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Join Date: Mar 2004
Nano35,
Good to see you here too! Are you planning to connect to the RPi via I2S?
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