Nice find kukynas! This regulator has very nice PSRR, much better than standard regulators. Would be a very good one for analog psu, IMO.
Hi Sunsun sorry I didn't notice this question before.
I did not buy a kit from Lampizator site but copied from his circuit diagrammes because by the time post and duty was added it worked out expensive.
I copied his 6Nxp SE kit plus two x tube psu kits.
Mine is all hard wired no pcbs.
I have since changed the tubes to Phillips E88CC SQ which gave me a less forward sound but give me more detail and a even bigger soundstage.
I also used bigger caps in psu and better output silver pio caps.
controller board
Has anyone schematic or component side photo of microcontroller board? I purchased as kit. While populating the kit, I noticed that there are two diode look alike footprints on the pcb (near 30pF capacitors) but there aren't suitable diodes in kit to fit there. Is it 1n4148? Can you confirm that? Also I can't read led's footprint, can you point out its proper mount direction?
There is a 2sb647 transistor footprint but I is not in use I think.
Has anyone schematic or component side photo of microcontroller board? I purchased as kit. While populating the kit, I noticed that there are two diode look alike footprints on the pcb (near 30pF capacitors) but there aren't suitable diodes in kit to fit there. Is it 1n4148? Can you confirm that? Also I can't read led's footprint, can you point out its proper mount direction?
There is a 2sb647 transistor footprint but I is not in use I think.
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Thank you.
Diodes look like 1n4148.
Did you populate this board yourself? One of 4-pin molex cable headers seem unpopulated.
There is a solder lump on B647 footprint. Looks like all of transistor pins connected together. Can you confirm this please?
No, I didn't populate the board, I bought the DAC ready made. The 4 pin molex is also absent on my pcb (at the DAC side), but they used an ordinary 4 pin header instead, which is easier to disconnect too. On the micro controller board I have 2 molex'es. So my advice would be to use the 4 pin molex on the micro controller pcb instead.
I think diode type isn't important, use a small one that fits.
The solder lump is indeed connecting 3 pins together. Just use a wire and solder it.
The resistor at the bottom, near pin 16, is used to set display back light current, you can increase it's value to manipulate back light intensity (lower it).
I think diode type isn't important, use a small one that fits.
The solder lump is indeed connecting 3 pins together. Just use a wire and solder it.
The resistor at the bottom, near pin 16, is used to set display back light current, you can increase it's value to manipulate back light intensity (lower it).
Hi terranigma
The diodes could also be used as voltage level converters, to be able to communicate with the AK4113/AK4118, which is a 3.3V device. It's explained here.
I can't see what types are used on my pcb. Do you know what pins they are connected to? Maybe we can solve it this way.
The diodes could also be used as voltage level converters, to be able to communicate with the AK4113/AK4118, which is a 3.3V device. It's explained here.
I can't see what types are used on my pcb. Do you know what pins they are connected to? Maybe we can solve it this way.
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Thanks for input.
Footprint shows a diode type component with cathode mark thus I know how to place it..I just soldered 1n4148 types. I want to use my Amanero usb/i2s interface and I'm trying to figure out how to install it without much trouble. I plan to use smalL signal relays to switch between onboard spdif-i2s and amanero.
resistor array
Hi, there is a resistor array on dac pcb and footprint says it is 10K*8 but kit contains all 4k7*8 (A472G). Can anyone check value of installed resistor array on dac pcb please? Probably they consider no problem with 4k7 one there.
Hi, there is a resistor array on dac pcb and footprint says it is 10K*8 but kit contains all 4k7*8 (A472G). Can anyone check value of installed resistor array on dac pcb please? Probably they consider no problem with 4k7 one there.
I can't see the value on my board, but since the resistors are pull-up resistors, I think 4k7 is fine. The serial communication lines are high frequency, which justifies lower value pull-up resistor IMO.
I fired up the board but things didn't go as I expected. Very distorted sound and one channel is not working. I measured voltages and digital supply was above 7V then it is not surprise that things didn't go well. I don't know why regulator caused such thing. I was using On Semi MC7805 in place of LT1085 by bending legs and implementation was right..Maybe I shouldn't solder the chips until measuring the voltages at regulator outputs.
Now I have to obtain new chips.
Now I have to obtain new chips.
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That's too bad terranigma, you must have made a faulty connection somewhere. Can you post some pictures of the pcb / 5V psu section?
I was going to post some pictures but it is not necessary so far because I made a big mistake while replacing the regulator.. Now I'm quite sure that two chips are entirely gone. My bad.
Hi,
Very interested in this DAC. It seems to be different opinions on which versions to get (AK4113 vs AK4118), is there finally a consensus on which one is preferable (I am planning to change the condos) ?
Also does someone compared it to the Subbu v3 ? Should I expect better results from this dual AK4399 ?
Thank you very much.
Very interested in this DAC. It seems to be different opinions on which versions to get (AK4113 vs AK4118), is there finally a consensus on which one is preferable (I am planning to change the condos) ?
Also does someone compared it to the Subbu v3 ? Should I expect better results from this dual AK4399 ?
Thank you very much.
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