Looks like you relased a TDA1545A board @ TDA1545A R2R Isolated nonoversampling NOS Audio DAC with FIFO reclock - DIYINHK
Can you clarify the output a bit. To me it looks like you are using an electrolytic capacitor in the signal path from the IV opamp to the output.
I guess this forms a high-pass filter with the resistor that is following it but why is that needed? Usually one does a low-pass filter to DACs to remove any high frequency noise.
Edit: If I read the datasheet correct it looks like this DAC has a hell of a DC offset in the output. So with 5V supply with 22k and 33k resistor divider the neutral signal is @ 3V and the output is swinging between 2V and 5V. So the electrolytic cap is used to remove DC offset, how does it affect the sound?
Can you clarify the output a bit. To me it looks like you are using an electrolytic capacitor in the signal path from the IV opamp to the output.
I guess this forms a high-pass filter with the resistor that is following it but why is that needed? Usually one does a low-pass filter to DACs to remove any high frequency noise.
Edit: If I read the datasheet correct it looks like this DAC has a hell of a DC offset in the output. So with 5V supply with 22k and 33k resistor divider the neutral signal is @ 3V and the output is swinging between 2V and 5V. So the electrolytic cap is used to remove DC offset, how does it affect the sound?
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yes, you are right,
for me, the sound signature is similar but better than TDA1541A
the output cap can be bypass easily if the output is connected to amp with built in input dc servo, such as the d1x headphone amp.
for me, the sound signature is similar but better than TDA1541A
the output cap can be bypass easily if the output is connected to amp with built in input dc servo, such as the d1x headphone amp.
Driving this DAC with a raspberry pi 2
Hi all,
Given the clock requirements given for this DAC by hi fi link-could the raspberry pi drive this DAC directly from its own pins?
( or could the USB out from the pi feed the Xmos module..then feed the DAC?)
Thanks boys
Johnny
Hi all,
Given the clock requirements given for this DAC by hi fi link-could the raspberry pi drive this DAC directly from its own pins?
( or could the USB out from the pi feed the Xmos module..then feed the DAC?)
Thanks boys
Johnny
Having a diyinhk 9018k2m dac, I decided to try his tda1545a, because all power supplies etc were 100% compliant.
It sounds nice with my OPA627 but I haven't tested it a lot and I am really confused doing a comparison with my existing 9018k2m.
An externally hosted image should be here but it was not working when we last tested it.
It sounds nice with my OPA627 but I haven't tested it a lot and I am really confused doing a comparison with my existing 9018k2m.
I am sorry for continuing posting in the wrong thread, but as I have already written some info about the TDA1545A, I just wanted to mention that after finishing the project ( connecting the Lout-Rout cables to the female RCA) and after hearing it for some hours, there's an annoying hiss with my setup.
I tried to find a solution by googling and I realized that many TDA based dacs suffer from hiss. I also contacted DIYINHK and he replied that this hiss is normal with this dac chip, so it's a good idea to keep it in mind if you are interested in this board.
I tried to find a solution by googling and I realized that many TDA based dacs suffer from hiss. I also contacted DIYINHK and he replied that this hiss is normal with this dac chip, so it's a good idea to keep it in mind if you are interested in this board.
You should open a specific thread, this is not the right place for this subject, with maybe more complete photographs to let the more experienced to help you. One of the whole cabinet to allow to see all the wires, one closer about the dac board....
There are no "hiss" problems in the TDAs dac chips I already tried : 1541;1541A;1540;1543;1545A (both dip & dil cases). Btw the way, what do you call "hiss" ? Etc... (deserve your own thread imho to have more help)
There are no "hiss" problems in the TDAs dac chips I already tried : 1541;1541A;1540;1543;1545A (both dip & dil cases). Btw the way, what do you call "hiss" ? Etc... (deserve your own thread imho to have more help)
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