Need info on Bush Premier CD-790
Just bought this player.
Does anybody have info about it? I'm particularly interested in knowing if it's multibit or bitstream...
Thank you!
Just bought this player.
Does anybody have info about it? I'm particularly interested in knowing if it's multibit or bitstream...
Thank you!
IC chips it uses
OK, i've opened it up today and found the following chips:
1x LC7881 (DAC)
1x LC7880 (DAC)
1x UM6116k (?)
2x NJM 4558S (dual op-amp, searching around reveals part nr. NJM 4558L as substitute), datasheet :
http://pdf.alldatasheet.com/datasheet-pdf/view/7234/NJRC/NJM14558L.html
1x LA9200 (analog signal processor)
1x M50930 (8-bit MCU)
And an unknown chip (covered by a dissipator), but according to the LA200 datasheet, could be an LC7860 or LC7863.
What can i do to improve the sound quality of this cd-player? Nothing too facy or i will surely mess it up...
Thanks in advance
OK, i've opened it up today and found the following chips:
1x LC7881 (DAC)
1x LC7880 (DAC)
1x UM6116k (?)
2x NJM 4558S (dual op-amp, searching around reveals part nr. NJM 4558L as substitute), datasheet :
http://pdf.alldatasheet.com/datasheet-pdf/view/7234/NJRC/NJM14558L.html
1x LA9200 (analog signal processor)
1x M50930 (8-bit MCU)
And an unknown chip (covered by a dissipator), but according to the LA200 datasheet, could be an LC7860 or LC7863.
What can i do to improve the sound quality of this cd-player? Nothing too facy or i will surely mess it up...
Thanks in advance
The 6116 is probably a 2k 8 bit static ram, used by the decoder.
Cant imagine you have 2 different dac's, so one is probably the decoder.
As for improvements, cant help. Just wondering if the basis is good enough to spend money on😕
Cant imagine you have 2 different dac's, so one is probably the decoder.
As for improvements, cant help. Just wondering if the basis is good enough to spend money on😕
Hey, i've already spent money buying it, so a few extra euros on it won't hurt...and learning is always a good deal 😀
I've been searching in the meantime, and will probably replace the NJM4558 parts by Burr-Brown OPA627 opamps (too bad i can't find anything tube related 😛 )
Can the DACs be replaced?
I've been searching in the meantime, and will probably replace the NJM4558 parts by Burr-Brown OPA627 opamps (too bad i can't find anything tube related 😛 )
Can the DACs be replaced?
err.... the OPA627 is out of the race, too heavy for my wallet and for the player.
I'm inclined between OPA2132/2228, AD823/712. I can only find AD826 and NJM4580 opamps here (it's a stupid country, i know), are they equivalent to the AD823? What are my other options as best replacements for the NJM4558?
Thanks once more.
I'm inclined between OPA2132/2228, AD823/712. I can only find AD826 and NJM4580 opamps here (it's a stupid country, i know), are they equivalent to the AD823? What are my other options as best replacements for the NJM4558?
Thanks once more.
Ok, here's what i did today, replaced the opamps for these vertical vero-boards with an 8-pin socket for changing opamps, as you can see in the picture.
It seems absurd, but no AD or OPA's can be found anywhere!
What other choices do i have?
I bought 2 NJM4580 for now, at least they are a bit better than the originals.
BTW, Guido, you're right, i have written donw one reference incorrectly, i have 1x LC7881 and 1x LC7860 🙂
It seems absurd, but no AD or OPA's can be found anywhere!
What other choices do i have?
I bought 2 NJM4580 for now, at least they are a bit better than the originals.
BTW, Guido, you're right, i have written donw one reference incorrectly, i have 1x LC7881 and 1x LC7860 🙂
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