I’ve been working on a dac and finally got the circuit board for it and I’ve now soldered it altogether
board
schematic
Being a bit new to all this I don’t really know what to do now that it doesn’t exactly work
There were a few things that troubled me with something shorting the 5v digital line to ground and I was removing parts trying to track that down, and ended up finding it at C65 on the board (in the pic linked above)
Next after that, the reg102's use for regulating the digital side voltage weren’t playing nice
The 5v one was outputting 4.75v with 5.6v feeding into it
As well as the 3.3v ones outputting 4.1v and 4.25v with them being fed from the 5v (that was at 4.75v)
Playing with some of the space chips of these I still couldn’t get them to output the voltage that they should have been even under no or little load out of circuit
Just using an lm7805 and an lm317t bypassing the reg102's onboard, it is now being fed the correct 5v and 3.3v now
With that going now, I plug in an optical signal from a cd player in it and all I am getting is white noise and static out of it, pausing or removing the signal stops the sound so something is getting through
I'm thinking that the df1704 and pcm1704 wants a 24bit wordlength and its only getting 16bit, in setting up the pins on the chips I wasn’t exactly sure what ones I was meant to set them to so I chose the ones that seemed to be the standard values
I am sort of stumped and where to go now, I don’t have an oscilloscope or fancy test equipment to play with, so if anyone could look over what I have done and point out anything I have missed I would be very grateful
Thanks,
board
schematic
Being a bit new to all this I don’t really know what to do now that it doesn’t exactly work
There were a few things that troubled me with something shorting the 5v digital line to ground and I was removing parts trying to track that down, and ended up finding it at C65 on the board (in the pic linked above)
Next after that, the reg102's use for regulating the digital side voltage weren’t playing nice
The 5v one was outputting 4.75v with 5.6v feeding into it
As well as the 3.3v ones outputting 4.1v and 4.25v with them being fed from the 5v (that was at 4.75v)
Playing with some of the space chips of these I still couldn’t get them to output the voltage that they should have been even under no or little load out of circuit
Just using an lm7805 and an lm317t bypassing the reg102's onboard, it is now being fed the correct 5v and 3.3v now
With that going now, I plug in an optical signal from a cd player in it and all I am getting is white noise and static out of it, pausing or removing the signal stops the sound so something is getting through
I'm thinking that the df1704 and pcm1704 wants a 24bit wordlength and its only getting 16bit, in setting up the pins on the chips I wasn’t exactly sure what ones I was meant to set them to so I chose the ones that seemed to be the standard values
I am sort of stumped and where to go now, I don’t have an oscilloscope or fancy test equipment to play with, so if anyone could look over what I have done and point out anything I have missed I would be very grateful
Thanks,