The sound is good. hope it can be better after run-in several days.
I am not good at how to describe the sound like. It is the situation that normally I will skip several songs in each album or just choose one or two songs from each album, even for easy-listening.
but with AD1862, I can survive many whole albums... the sound is just attractive.
I am not good at how to describe the sound like. It is the situation that normally I will skip several songs in each album or just choose one or two songs from each album, even for easy-listening.
but with AD1862, I can survive many whole albums... the sound is just attractive.
Compare the LME49990 from "china" with LM6171 from a trusted source. There can be a sound improvement for you 🙂
I will go with the second option, but many people prefer different regulators. If you like an LDO, 4.75V is the lowest limit. It would be nice to have it up to +-5.0DCV (by regulating the voltage from a higher voltage supply).
I will go with the second option, but many people prefer different regulators. If you like an LDO, 4.75V is the lowest limit. It would be nice to have it up to +-5.0DCV (by regulating the voltage from a higher voltage supply).
Ideally, your pre-regulation circuit should be 2v to 3v higher than what your LT3045/LT3094 LDO regulator output is set for. It seems the low output voltage of the LDO’s is from not having high enough input voltage to account for their dropout voltage.
Very nice setup!
Compare sound with/without the LDO regulators.
Enjoy
Very nice setup!
Compare sound with/without the LDO regulators.
Enjoy
Has anyone tried the AD844 for I/V with a buffer opamp after it like OPA627 or OPA1641 with this dac board?
The LT3045 is specified with a dropout voltage of 260mV.
There is little performance gain (e.g. PSRR) in the audio band for dropout voltage higher than 1.5V.
Cheers,
Patrick
There is little performance gain (e.g. PSRR) in the audio band for dropout voltage higher than 1.5V.
Cheers,
Patrick
The opa861 is better than the AD844 for the job and you don't need to // 3 of them for the same job of a single 861 ! It's not the ad844 is bad, it in't and was used for that task but the 861 swapped it better.
If now we have not guarantee anymore there are fakes in China, where are we going ?😀
Thanks Diyiggy, I was thinking the same. Plus 6 AD844’s will be $100 😱
I haven’t tried listening with the second OPA861 removed from my I/V boards yet. Rather than hack up a pair of perfectly good boards, I’ll build a new set with the goal of a single OPA861 in mind.
The second set of boards was populated with Susumu RS/RG resistors and a combo of C0G and Panasonic films, but no changes to circuit. It sounds very good to my ears as is. Lately, I’ve been spending time experimenting with different power supply configurations.
Looking at the schematic, in order to bypass the second OPA861, I’ll install a jumper from the pad of C10 to the output pin and omit the following parts: C4, C10, R8, R9, R10, U3
You’ve got me curious about this mod, I will try it 😉
Looking at the schematic, in order to bypass the second OPA861, I’ll install a jumper from the pad of C10 to the output pin and omit the following parts: C4, C10, R8, R9, R10, U3
You’ve got me curious about this mod, I will try it 😉
This is not what I said... 😉 and if you bypass the second opa861 you still will need a resistor after u1...
Hello i did what you suggest. Only thing is that i don t have the Allen Bradley at the output, only a smd resistor
I m listen and it sounds good. But a litle metallic sound.
Why Allen bradley resistor?
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In my setup the tda1541a with a 150 R at the outputt of the opa861 as buf. was a very good improvment but only in 1/8 W , the 1/4, 1/2 w were very different !
Not mettalic in my setup, nore mellow, I believe the 150 R is not a big value at the output but I can hear eac resistor I tried there from tantalum to Dale Rn55 (the worst for me) and many else ! I believe the very thin leads of the 1/8W where for something related to my whole setup ! I must say the tda1541a dac is dc coupled : no traffo, no caps : sounds are so subtle but still hearable I had to avoid any soldering of this resistr cause the solder whatever the comp (silver 4% the worst) wasted the perfect equilibrium it gave (I repeat : in my setup) !
Despite it's carbon comp it sounds right to my ears : maybe some H3 trace or a little distorss : but again 150 R is very few but that R is mandatory for best results. (The R of the I/V is a Rohpoint ayrton Perry wirewound 516G) : the fact there is not the small loopback cap in the buffer sounds better too if the whole setup or headphones is sensible enough to that changes.
If metallic : look at & focus on the supply and decoupling (and the source quality too).
At the end those smal details have to be adapted and worked for each of us in relation to their whole setup by ears...
R8 : try to 1K to see if different than the 830R in your case - I mean still with no outpout 861 buf- I believe the 200R with the 861 but in between is also too much little but at each to find the equilibrium he likes most : that's an easy way to tune that playing a little with passive parts and supply here to reach his subjectives liked tastes 🙂 Nothing writen in the marble but if you measure only which is not the final goal of a NOS DAC. Imho, YMMV ! 🙂
Not mettalic in my setup, nore mellow, I believe the 150 R is not a big value at the output but I can hear eac resistor I tried there from tantalum to Dale Rn55 (the worst for me) and many else ! I believe the very thin leads of the 1/8W where for something related to my whole setup ! I must say the tda1541a dac is dc coupled : no traffo, no caps : sounds are so subtle but still hearable I had to avoid any soldering of this resistr cause the solder whatever the comp (silver 4% the worst) wasted the perfect equilibrium it gave (I repeat : in my setup) !
Despite it's carbon comp it sounds right to my ears : maybe some H3 trace or a little distorss : but again 150 R is very few but that R is mandatory for best results. (The R of the I/V is a Rohpoint ayrton Perry wirewound 516G) : the fact there is not the small loopback cap in the buffer sounds better too if the whole setup or headphones is sensible enough to that changes.
If metallic : look at & focus on the supply and decoupling (and the source quality too).
At the end those smal details have to be adapted and worked for each of us in relation to their whole setup by ears...
R8 : try to 1K to see if different than the 830R in your case - I mean still with no outpout 861 buf- I believe the 200R with the 861 but in between is also too much little but at each to find the equilibrium he likes most : that's an easy way to tune that playing a little with passive parts and supply here to reach his subjectives liked tastes 🙂 Nothing writen in the marble but if you measure only which is not the final goal of a NOS DAC. Imho, YMMV ! 🙂
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This is the second time i try some sort of iv with opa861. The first time was with a pcm1704 dac. I feel the buffer bad sounding and had a lot of dc offset. Without the buffer sounded better but lack some emotional..
In this case with ad1862 i feel that the sound is not pleasing as with pcm1704 i felt the same. It has dynamics, attack etc but the sound is not pleasent...not emotional..
Highs are arsh.. dont know but is the same feeling that is missing something..
Everyone says opa861 is the best but i cannot ear it.
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Coul you drop a picure of the whole dac with the PS.. it's almost ipossible to tweak without listening a set up but I can try, at least if I find to see something I know I don't like subjectivly related to the described sound.
I believe it's a layout bad marriage maybe.
I believe it's a layout bad marriage maybe.
Lifepo4 battery
I am trying to use two 3.2V Lifepo4 Batteries for -+5V digital part of AD1862.
It doesn't explode! ^____^
The sound image is more precise and 3D...
worth to try
I am trying to use two 3.2V Lifepo4 Batteries for -+5V digital part of AD1862.
It doesn't explode! ^____^
The sound image is more precise and 3D...
worth to try
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