Do I understand correctly that using PSU 1 or 2 there will be no problem with connecting AGND and DGND in the wrong place?
That's funny I am not trusted after 5 pcb design of an AD1862 made for high frequencies op amps, ahaha ! Thanks miro1360 ! Yes the purpose of that is the 2 pins must be connected, the lowest distance and cleanest path together ! The cleanest though is almost a joke and ask some creativity for playing with the 4 layers ! It's a little a current washing machine bellow the chip, mixing the dirt cloth with the less dirt ones.
I would say it 's essential to connect them near these 2 pins only, under the chips bully, somewhat but digital line and power supplies make the things not easy, as the fact there are two chips.
No probs Eclipsevl, we didn't understand you was talking about the power supply pcb and not the DAC one. Pcb are expensive 😉
I would say it 's essential to connect them near these 2 pins only, under the chips bully, somewhat but digital line and power supplies make the things not easy, as the fact there are two chips.
No probs Eclipsevl, we didn't understand you was talking about the power supply pcb and not the DAC one. Pcb are expensive 😉
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I said it second degree ! 🙂 (you know, my rock'n roll famous gale attitude !)
Btw I didn't finished to test the AD811, but fuses arrived today, I have somewhere a short that burn the positive fuse on the PSU2 (I removed one LT1963 and it is not the culpritt, I am to check the diode bridge now but I'd better construct another PSUII as I have all the parts !
I am slower and slower...
Btw I didn't finished to test the AD811, but fuses arrived today, I have somewhere a short that burn the positive fuse on the PSU2 (I removed one LT1963 and it is not the culpritt, I am to check the diode bridge now but I'd better construct another PSUII as I have all the parts !
I am slower and slower...
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These PSU are designed to work with my DACs, but you can use it for another projects as well. Grounds are connected on filtration capacitors, then separated at the regulators and then it depends on the application where they will be connected (for DACs they should be connected near the DAC chips - on the DAC pcb) 🙂
Did couple of measurements today, PCM63 DAC at 0dB:
-100dB @ 50Hz, I think is a decent result for DAC on a cardboard 🙂
-100dB @ 50Hz, I think is a decent result for DAC on a cardboard 🙂
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I removed the trimming circuits and tantalums C31 and C36 and it seems to be better 🙂
I have a few more questions:
1. I don't know how to check if both circuits play the same. I have an oscilloscope and a Focusrite interface. Is there a way to test this?
2. Is it possible to trim the chips correctly using the linearity test from post #33?
3. Is it better to order new chips with the same numbers instead?
4. Is it worth replacing any other elements with better ones?
5. Is it worth making @Hidy's modification from post #2687 for Burson v7 classic? I assume that it is possible to continue testing other operational amplifiers, e.g. sparkos or staccato.
6. @Brijac Capacitors C25, C26, C15, C16 are probably for C26 and C16 2x10uF (one on the top of the board and the other on the bottom) and for C15 and C16 2x1uF (one on the top of the board and the other on the bottom). Please verify because I'm not sure if I'm reading the values correctly. I'm uploading photos to check.
7. Is it better to put 4.7uF and 47uF or 10uF and 100uF in these places? What's the difference?
8. What wiring should I use for i2s connections, and what for the power supply?
