Is there any alternatives to the recomended I/V stage opamps that are THT (DIP8)? The OPA627 is very expensive and the LM6171 seems to have higher distortion than the other opamps. Has anyone tried a AD811 based I/V stage with the AD1862, I think it needs a resistor between the current summing junction and the inverting input and a 2.2 nF feedback capacitor.
Ok, I think I'm just being lazy, I will try to dig some info about I/V stage opamps in the thread.
People cannot do the reading for you.
One example :
https://www.diyaudio.com/community/...st-tht-i2s-input-nos-r-2r.354078/post-7264825
Patrick
One example :
https://www.diyaudio.com/community/...st-tht-i2s-input-nos-r-2r.354078/post-7264825
Patrick
I don't know about the AD1862, I just haven't made it yet, just like I haven't made the TDA1541 either. 🤣
For PCM63, Burson V6 Classic has performed best so far.
For AD1865 and PCM1702, Burson V5 (old model) and Sparkos SS3601 sound best to me.
Of all that, tubes are the best, whoever has the will and desire to use them. 😊
I'm glad you're considering an I/V conversion solution with the AD811. In my opinion, it is the best solution and at the same time the simplest, but it requires a top-quality power supply and a well-designed PCB since it is a video op-amp. No capacitor is needed at the output, and a sufficiently large current and low impedance of the AD811 can directly drive any amplifier.
Some useful information.
I tried this OPA861 IV schematic by @Vunce with good result, you may take a look
https://www.diyaudio.com/community/...st-tht-i2s-input-nos-r-2r.354078/post-6286307
PCB manufacturing files here,
https://www.diyaudio.com/community/threads/dac-ad1862-almost-tht-i2s-input-nos-r-2r.354078/page-71#post-6516751
Yes, I think so as well. The original build mentioned above is a DIP compatible format. One good thing is it does not require a seperate power supply as it includes a power conversion from 12V to 5V 🙂
For pcm63, do not use caps on c43 c44, that literally kills the music 😅 Resolution, spaciousness, bass, everything is like hiding under a rock. Crazy how bad it influences..
I always doubt myself when it comes to this (psychoacoustics are a big factor), hence i always like to have someone else confirm or disagree with my observations. This was night and day difference, but i still had a listen with people i trust in. Confirmed. Then removed, and it literally was like going from slums to royal chambers.
I will have to removed C43 and C44 on my PCM63 and see if I can hear a difference.
I must have missed the hint about using them.
I must have missed the hint about using them.
A good landing page 🙂 ,
https://electrodac.blogspot.com/p/dac-ad1862-almost-tht-i2s-input-nos-r.html