Ok, so HCT is the way to go.
Do you know why the AD1862 needs a symmetrical voltage supply (+/- 5 V) for the digital section. 🤔
Do you know why the AD1862 needs a symmetrical voltage supply (+/- 5 V) for the digital section. 🤔
According to datasheet the symmetrical PSU is not the requirement. How it will behave under non-symmetric is the subject of testing which probably no one has done 😁
However, there is one limitation: –VD may not be more negative than –VA
+-VD is designed to operate from +-5V up to +-12V
+-VA is designed to operate on +-12V
However, there is one limitation: –VD may not be more negative than –VA
+-VD is designed to operate from +-5V up to +-12V
+-VA is designed to operate on +-12V
According to datashhet:
POWER SUPPLY
Voltage VL and –VL 4.75 12.0 13.2 ±V (digital part)
Voltage VS and –VS 10.8 12.0 13.2 ±V (analog part)
POWER SUPPLY
Voltage VL and –VL 4.75 12.0 13.2 ±V (digital part)
Voltage VS and –VS 10.8 12.0 13.2 ±V (analog part)
What do you think Miro, regarding the AD1862, is it better to go with a higher supply voltage for the digital part, say +-10 to +-11V or leave it at +-5V? Is there a difference in the sound quality or is it all the same? I'm interested if anyone has tried it?
I never tested the AD1862 myself, unfortunately, because they are very rare nowadays, shipping to Europe seems nearly impossible due to aburdly high taxes. In my humble opinion, if you keep the digital supply within the specified range it should make no difference. 😛
Regarding the analog part I think it's better to be at least 12 V (or a bit higher, up to about 13 V), to avoid signal excursion problems and distortion increase, also good supply regulation is advised, and voltage regulators or buffered voltage references should be included.
Edit:
You should also use separate power supplies for analog and digital sections, for better performance.
Regarding the analog part I think it's better to be at least 12 V (or a bit higher, up to about 13 V), to avoid signal excursion problems and distortion increase, also good supply regulation is advised, and voltage regulators or buffered voltage references should be included.
Edit:
You should also use separate power supplies for analog and digital sections, for better performance.
@danny92 I calculated the final price with VAT and TAX after importing here in the EU, it can be 40€ per one DAC, so 80€ per pair.
It's a little more than it would be if you bought it from someone in the US, but the problem is what to do with 5 extra pairs, how and who to sell it to here in the EU for 100€/pair with shipping 🤔
... it is hard to sell in countries where people have no problem spent €20-30€ for a dinner in restaurant
It's a little more than it would be if you bought it from someone in the US, but the problem is what to do with 5 extra pairs, how and who to sell it to here in the EU for 100€/pair with shipping 🤔
... it is hard to sell in countries where people have no problem spent €20-30€ for a dinner in restaurant
@miro1360 There is also another issue, I'm afraid, the only remaining supplier of AD1862 chips is Rochester Electronics, and they are only selling in multiples of 12 to companies, as you can see in this thread:
https://www.diyaudio.com/community/...d1865n-j-dac-chips.368012/page-7#post-7399802
https://www.diyaudio.com/community/...d1865n-j-dac-chips.368012/page-7#post-7399802
@danny92 As long as the stock count is big enough, it should pass through digikey (you need to fill the proposal form during checkout).
I personally don't know what to put in the personal proposal form. Maybe you keep 2 pieces and sell the rest for DIY purposes, or you keep all for DIY or for repairing purposes? I don't know 😁
I personally don't know what to put in the personal proposal form. Maybe you keep 2 pieces and sell the rest for DIY purposes, or you keep all for DIY or for repairing purposes? I don't know 😁
Yes, it's possibility, the problem are the costs, which make the final price very high for my current budget. 😕
This one worth every penny! Redo your budget and go for it! 😉
It is better to go with higher Vd voltages. Better sound. (Could be explained with more wide input window for 5Vpp digital inputs... Less peaks and probably less ground bounces.)
Also with higher Analog Supply, is benefit to use same supply of +-12V for say JFET buffer after Riv convesion. To have low impedance powerful driver for anything next in the line
That's probably how it will be, +-10V for the digital part, +-12V for the analog part and the I/V stage. It will probably be passive I/V, supported by some tubes gain stage.
miro, i need some help, the tda1540 plays over 3 months, something happen today, the offset led off, so i power off and power on again, the led is light 1 sec and turn off again, i measured the tpL and tpR, tpL is 1.5v, tpR is -1.5v, any idea of that situation?
From the specs, max Vcc of 74HCT164D is 7v, did you use a separate power? Or you did not use shift registers?
-VD should not be less negative than -VA, that's why I planned -10V and -12V, to be on the safe side. That's the limit from the datasheet.