I know, I'm relying on my own research and deduction. I may be wrong, but it's only money. I just recognized the part number format printed on the trafos. They were also listed as jt 11-dm before Jensen changed their part numbers years ago.
Looking at the datasheet for DIR9001 and if I see it right it it only has 1 input....is this right?
And on my DAC board I don´t see any input settings,so it must be some kind of automatic,I will test that.
And on my DAC board I don´t see any input settings,so it must be some kind of automatic,I will test that.
Ok,I found the input switch....
Any Ideas how to make this automatik?When theres a s/pdif signal on one input it switches to that input.
Any Ideas how to make this automatik?When theres a s/pdif signal on one input it switches to that input.
STC4Life r u still having the same problem, I t also have a similar issue, I had mine working for a few months before it died, first one channel and then the second, very strange. and when I power down the DAC I also get the squeek sound from the speaker.
Has me stumped, Cant figure out whats going on could be the traffos could be a stuffed DAC.
🙁
Has me stumped, Cant figure out whats going on could be the traffos could be a stuffed DAC.
🙁
yes. I still am having the same problems, but have not had a ton of time to work on it recently. I am totally confused because I am getting voltage at all the right places (at least up to the transfo), but no sound (even if I go straight from the 4398 to the RCAs.😕 I will report back if I come up with anything.
I doubt they're bogus - the wires even have the Jensen color scheme. If they're 80% nickel similar to the JT-11-DMCF it's a darn good deal. I convinced a few people on a local forum to buy them. If ever they suck I'll just say "this guy Bill on DIYaudio told me to buy them"
there are still 3 left, would you consider those a good upgrade, better than opamp upgrades?
I doubt they're bogus - the wires even have the Jensen color scheme. If they're 80% nickel similar to the JT-11-DMCF it's a darn good deal. I convinced a few people on a local forum to buy them. If ever they suck I'll just say "this guy Bill on DIYaudio told me to buy them"
😀
That would be like comparing apples to oranges.
Tons of feedback compared to zero feedback, different sonic signature. There are different flavors of both trafos and opamps, only you can decide. I have heard the 4562 in an I/V circuit and was impressed, but this is different.
Listening to a OPA632 in the Gigaworks DAC and the Lundahl LL1690 transformers in my DAC, I'd say the transformers are better, in my opinion, in my system, with my listening biases, in my room, with the music I like. etc.
Sheldon
Sheldon
I wonder if it would be a big step up from the Gigaworks.
Their next pre-order for the Buffalo is June 20th for shipment in August. Their last pre-order was on June 6th. I sent them a few emails but never got a reply.
Not easy dealing with these guys. It's like trying to buy a limited edition Ferrari.
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This is my second try ... Nobody can´t answer ?
Hi, is any experience with this DAC ?
AD1955 + DIR9001 24bit 96k SPDIF + USB DAC assembled ! - eBay (item 320507073764 end time Jun-22-10 01:58:03 PDT)
All components are better then Gigawork ... ( DIR9001, OPA 2604 ... )
AD1955 + DIR9001 24bit 96k SPDIF + USB DAC assembled ! - eBay (item 320507073764 end time Jun-22-10 01:58:03 PDT)
Hi, is any experience with this DAC ?
AD1955 + DIR9001 24bit 96k SPDIF + USB DAC assembled ! - eBay (item 320507073764 end time Jun-22-10 01:58:03 PDT)
All components are better then Gigawork ... ( DIR9001, OPA 2604 ... )
AD1955 + DIR9001 24bit 96k SPDIF + USB DAC assembled ! - eBay (item 320507073764 end time Jun-22-10 01:58:03 PDT)
Send us all one and we will compare them for you.
Seriously, component superiority is a subjective argument that I am not eager to have. Let's just let Analog Devices, Crystal, Burr Brown, et,al fight it out in their advertising so we all win.
CS8421 2.5V mod
Hi guys, wanted to share my implementation of 2.5V mod for CS8421. All you need here is 1117 fixed voltage regulator (I went with LM1117-2.5) and possibly some kind of mounting pad for SOT-23 casing (I cut mounting pad from main DAC board, where 3.3V regulator used to be, it was replaced by Salas regulator), or you can mount it on the wires, or some other way. Now, if you'll look at the CS8421 daughterboard layout, you'll see that 3.3V comes out of AMS1117 regulator and goes into pin 17(VL) of the chip, and then _under_ the chip this trace goes to pin 3(VD), which is the pin we need to provide with 2.5V. So, it is not possible to cut the trace without removing the chip, which can be done with the help of air gun of course, but I went with carefully lifting pin 3 with a needle and connecting 2.5V output from new regulator. You'll need soldering iron with fine tip to do that. Here are the pictures, sorry fo my ugly soldering 🙂
As for the wiring of new 2.5V reg - connect it's input with 3.3V reg input and ground with 3.3V reg ground. Output goes to the lifted pin 3. The capacitor on top of the new reg is 1uF (connected to the output and ground), don't know if it is really needed there, the CS8421 datasheet says that it should be there (although it's 0,1uF in the datasheet).
Don't know if this mod intended to change anything in sound, seems that it is more about safety of the chip.
That's all, use it on your own risk 🙂
Thanks,
Fedor
Hi guys, wanted to share my implementation of 2.5V mod for CS8421. All you need here is 1117 fixed voltage regulator (I went with LM1117-2.5) and possibly some kind of mounting pad for SOT-23 casing (I cut mounting pad from main DAC board, where 3.3V regulator used to be, it was replaced by Salas regulator), or you can mount it on the wires, or some other way. Now, if you'll look at the CS8421 daughterboard layout, you'll see that 3.3V comes out of AMS1117 regulator and goes into pin 17(VL) of the chip, and then _under_ the chip this trace goes to pin 3(VD), which is the pin we need to provide with 2.5V. So, it is not possible to cut the trace without removing the chip, which can be done with the help of air gun of course, but I went with carefully lifting pin 3 with a needle and connecting 2.5V output from new regulator. You'll need soldering iron with fine tip to do that. Here are the pictures, sorry fo my ugly soldering 🙂
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
As for the wiring of new 2.5V reg - connect it's input with 3.3V reg input and ground with 3.3V reg ground. Output goes to the lifted pin 3. The capacitor on top of the new reg is 1uF (connected to the output and ground), don't know if it is really needed there, the CS8421 datasheet says that it should be there (although it's 0,1uF in the datasheet).
Don't know if this mod intended to change anything in sound, seems that it is more about safety of the chip.
That's all, use it on your own risk 🙂
Thanks,
Fedor
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