Fixed it - had shorted 2 pins on one of the 74HCT164D underneath the chip with a blob of solder. What a muppet!Good news is my SPDIF/Optical board works - get data, lrclk and bclk signals on the scope
Bad news is the DAC doesn't work.... need to trace some stuff out. Got power in all the right places, but data isn't getting through. Time to see what I can find with the scope. Expect I messed something up on the 74HCT164D somewhere
When I connect the DAC to the I2S board the LRCLK signal is still good. But the other 2 signals drop to zero/noise. So I am not sure what's going on at the mo. I've pulled the opamps and DAC chips out for now.
It looks very nice. My AD1862 is on a board.
Use a switch wired with shielded wire (it can be SATA cable or anything for HF) ... the shield must be connected with GND on one side (shielded wires near the switch are connected together)Question for the collective. The SPDIF/optical input board has a jumper to select one or the other input. I really want to use both with 2 different sources. Can I fit a remote changeover switch given that this is in the digital signal path? It would be around 6" of cable to the switch on the panel.
Would it be better to build another input board and switch them with an I2S switch? I have the boards and components to do that, but if I could run less boards then I'd prefer that.
Thanks very much! I'll give it a try and let you know how it goes. I have some spare SATA cables kicking around so will use one of those.Use a switch wired with shielded wire (it can be SATA cable or anything for HF) ... the shield must be connected with GND on one side (shielded wires near the switch are connected together)
Another option is can be relay as jimk04 suggested.
>>I'd like to know - is the possibility to make a balance DAC? I have a balance amp.
You can do it with 2 PCBs and custom I/V (the second one has inverted DATA). Better if you let a preamp to make it balance (single to balanced output) or avoid balanced at all for a short distance if your amplifier has single input possibility.