I have put 'the DAC' together but have no sound...
This is a PCM63 board fed by the JLsound USB board, and with Sparkos opamps. When I started trouble shooting, I found 0.8vdc/offset on one output and 1.9vdc on the other, which seems wrong. When I swap the PCM63 chips left-to-right, the DC voltages/offset follow, maybe indicating something wrong with DAC chips. Does anyone have any insights?
Cheers,
Soren
This is a PCM63 board fed by the JLsound USB board, and with Sparkos opamps. When I started trouble shooting, I found 0.8vdc/offset on one output and 1.9vdc on the other, which seems wrong. When I swap the PCM63 chips left-to-right, the DC voltages/offset follow, maybe indicating something wrong with DAC chips. Does anyone have any insights?
Cheers,
Soren
I did try with the JLsound powered off and the DC offset was stil there. The JLsound is configured for PCM63, which is the same as AD1862...now I want to recheck the hookup.
I verified all the different voltages in the sockets before plugging in the PCM63 and opamps, as they are precious. First, I tried swapping the opamps left to right which made no difference, but swapping the PCM63s does flip the offset between the channels.
I verified all the different voltages in the sockets before plugging in the PCM63 and opamps, as they are precious. First, I tried swapping the opamps left to right which made no difference, but swapping the PCM63s does flip the offset between the channels.
Thanks for the input Guys.
A good nights sleep made me spot my error, and what may have fried the chips. I use the external oscillator board for the JLsounds USB board and in my quest to keep the wiring neat, wired it erroneously from below. In my search for errors I moved to wiring to the top of of the oscillator board, mirroing my working 1862 DAC, and I just realized that in the first iteration DL/DR/LRCK/BCLK (pins 9/11/13/15) were wired to ground on the wrong side of the 20 pin connector
I feel bad having removed two pcm63 chips from this world
Cheers,
Soren
A good nights sleep made me spot my error, and what may have fried the chips. I use the external oscillator board for the JLsounds USB board and in my quest to keep the wiring neat, wired it erroneously from below. In my search for errors I moved to wiring to the top of of the oscillator board, mirroing my working 1862 DAC, and I just realized that in the first iteration DL/DR/LRCK/BCLK (pins 9/11/13/15) were wired to ground on the wrong side of the 20 pin connector
I feel bad having removed two pcm63 chips from this world
Cheers,
Soren
Me too. I can't know for sure they are dead and will stare some more at the board and triple check everything as I would also want to reassure myself before plugging in replacements, should I find them. The asymmetric DC offset that follows the chips, when I swap them, suggest they produce it ... and that I fried them.
There is hope. I got music from one channel. It seems the sockets aren't snug enough around the legs of the chips, but I was able to get one channel to drop the dc offset and make music. Now, does anyone have suggestions for improving contact between chip and socket?
it is not very easy to fry them via digital inputs if the voltages have not exceeded VdMe too. I can't know for sure they are dead and will stare some more at the board and triple check everything as I would also want to reassure myself before plugging in replacements, should I find them. The asymmetric DC offset that follows the chips, when I swap them, suggest they produce it ... and that I fried them.
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that's good newsThere is hope. I got music from one channel. It seems the sockets aren't snug enough around the legs of the chips, but I was able to get one channel to drop the dc offset and make music. Now, does anyone have suggestions for improving contact between chip and socket?
do you have any picture of that sockets ?
They come in/out almost too easily. The socket is the following: https://www.mouser.com/ProductDetail/571-2-1571586-9
Photo below.
Photo below.
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