Hi Ryanj,
I have your pcb from the last batch and am planning to start this project soon. If I’m reading your above statement correctly, there will not be any technical “improvements” with the current GB pcb and performance will be the same with the board I have?
Thanks 😉
Hi vunce,
I started changing the design of the D3 pcb but decided i will not go ahead with any change and keep the design as is, because i soon realised that a redesign would require me to make another test board to make sure every thing is working ok and i dont have the time or money to go through that again - its a lot of work, i think it took me around 200+ hours in simulations, testing circuits with 3 test pcbs to get to this point. The current design works very well you just need to take special care of the soldering for the sot23 footprints as test the main power supply section before going ahead with populating the rest of the board.
Sounds good Ryan!
I appreciate all the time and effort you have put into this project and look forward to starting mine. No worries about the SOT23 components 😉
I appreciate all the time and effort you have put into this project and look forward to starting mine. No worries about the SOT23 components 😉
Hi Ryanj,
If R3, C4 and Q2 were removed from your capMx circuit that would reduce the voltage drop by almost half and I could use a transformer I already have. Would there be a negative performance trade off in doing this?
D3CapMXSchematics.PDF - Google Drive
If R3, C4 and Q2 were removed from your capMx circuit that would reduce the voltage drop by almost half and I could use a transformer I already have. Would there be a negative performance trade off in doing this?
D3CapMXSchematics.PDF - Google Drive
Hi,
Yes there is a trade off in performance. According to LTspice you will get about 60dB more ripple at 100Hz.
Yes there is a trade off in performance. According to LTspice you will get about 60dB more ripple at 100Hz.
I’m ready to start my D3 journey! I’ve 95% of the parts in hand, this bom was a bit tricky because multiple suppliers were needed to source all the components.
But, now I’m concerned I somehow missed a bunch of information how to feed a signal to this board? I have an I2SoverUSB module, but that will not connect via the Hirose RF connections on the D3 Dac board.
Can the I2SoverUSB feed the D3 directly with customized cabling or do I need additional components? 😕
But, now I’m concerned I somehow missed a bunch of information how to feed a signal to this board? I have an I2SoverUSB module, but that will not connect via the Hirose RF connections on the D3 Dac board.
Can the I2SoverUSB feed the D3 directly with customized cabling or do I need additional components? 😕
If it’s the Jlsounds board (that’s what I remember you buying), then you can use it to feed the D3 directly, spliced one one side, Hirose on the other. Also, the Jl board can feed simultaneous data to the TDA1541. therefore, you don’t need any other hardware but hirose SMD cables.
When you populate the D3, please follow Ryan’s suggestions and install the Vregs first, then test voltages WITH a load present. Once voltages look good, then proceed. Only proceed when you have got the voltages correct, this is critical. Do not just populate the board!
Look back at my or Ryan’s post for the sequence. This isn’t a hard build but it does require a stepwise process.
Use low temp solder paste, and get extra Vregs, as they damage easily.
Cheers,
Greg
When you populate the D3, please follow Ryan’s suggestions and install the Vregs first, then test voltages WITH a load present. Once voltages look good, then proceed. Only proceed when you have got the voltages correct, this is critical. Do not just populate the board!
Look back at my or Ryan’s post for the sequence. This isn’t a hard build but it does require a stepwise process.
Use low temp solder paste, and get extra Vregs, as they damage easily.
Cheers,
Greg
Thanks for the tips Greg!!
I do have the JLS module, I purchased it specifically for this project because of its simultaneous data ability. 😉
I do have the JLS module, I purchased it specifically for this project because of its simultaneous data ability. 😉
I’ve soldered wires directly to those inputs then Used a bit of hot glue to help with strain relief To make sure the wire (or the whole pad) Doesn’t tear off as I was moving things around.
Those hi-rose connectors are lovely and all but the connecting wires ain’t cheap! And if you are trying to connect to something that does not use the same on the other end then that is a problem (I’ve never checkEd to learn if you can get this hirose interconnects with one end with no terminal)
Those hi-rose connectors are lovely and all but the connecting wires ain’t cheap! And if you are trying to connect to something that does not use the same on the other end then that is a problem (I’ve never checkEd to learn if you can get this hirose interconnects with one end with no terminal)
I agree, once I cut and terminate one end of the U.fl cable it defeats any benefit of using the cable. I will dig in and look for an elegant solution......
Vunce,
Mouser has some very affordable u.fl cable assemblies that are only terminated on one end.
Mouser has some very affordable u.fl cable assemblies that are only terminated on one end.