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Post by Deleted on Mar 4, 2010 10:11:59 GMT
Will I was thinking about breaking the +5V supply rail to the 5V oscillator module at it's 2 ferrite beads encapsulated assembly, of which it has quite a few, and inserting +5V from a Cricket there. Up till now , there hasn't been too much room to fit an additional JLH etc. Alex
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Post by jeffc on Mar 4, 2010 23:54:31 GMT
Morning Alex, You had coffee yet or am I going mad. What the.... Doesn't the CVXO require a 3.3V supply, i can't picture what you're suggesting. Will... currently I have one dual 3.3V Cricket board in use. One Cricket supplying the CVXO which I've linked via short wires to the where the Xtal was removed from on the DIR9001 receiver board. Actually wired to where the bottom 33pf ceramaic cap was. The other 3.3V Cricket is being used to supply the 3.3V input of the DSD1796 DAC chip exactly as described by Alex. I also have a JLH PSRR on the 5V supply to the receiver board. My plan is to test the other dual 3.3V/5V Cricket board using the 3.3V one to supply the DIR9001 chip, 3.3V Reg4 removed, 100uf oscons used currently for decoupling reduced to 10uf to avoid and potential for the LME49710 apamp used in the Cricket to oscillate. The 5V one will then be used to supply the 5V inputs of the DAC chip, 5V Reg5 removed. With these changes, there probably won't be much value in retaining the JLH on the 5V supply to the receiver board. Firstly if these Crickets work for these applications, and secondly if they add anything to the already fanatastic SQ I'm hearing, this SC-DAC could well be turned into a DAC giant killer. cheers.. Jeff
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Post by Deleted on Mar 5, 2010 0:05:20 GMT
Hi Jeff You had your coffee yet ? ;D) I was replying to Will's question about mods to the X-DAC V3. The X-DAC V3 uses a 5V oscillator module. I could also use the same Osc PCB with a 5V Zener reference, and try a 24.576MHZ module with it that I got from Rockby, although I supect it may be better to use the existing oscillator module powered by a 5V Cricket. Alex
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Post by jeffc on Mar 5, 2010 2:01:42 GMT
I'm at work and yes it was pre-coffee, with everything being done at speed, and with my small brain struggling to deal with far too much to see minor details like you were actually referring to your reference DAC Shouldn't really be checking in at work, lesson learned.
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Spirit
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Post by Spirit on Mar 5, 2010 2:33:11 GMT
Firstly if these Crickets work for these applications, and secondly if they add anything to the already fanatastic SQ I'm hearing, this SC-DAC could well be turned into a DAC giant killer. We shall find out soon enough ;D BII should ship next week...
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Post by Deleted on Mar 5, 2010 2:39:24 GMT
Firstly if these Crickets work for these applications, and secondly if they add anything to the already fanatastic SQ I'm hearing, this SC-DAC could well be turned into a DAC giant killer. We shall find out soon enough ;D BII should ship next week... Phil Even if Jeff's DAC doesn't quite beat your pieces of Lego, it will have cost a lot less than you paid for yours ? Alex
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Spirit
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Post by Spirit on Mar 5, 2010 2:41:09 GMT
Phil Even if Jeff's DAC doesn't quite beat your pieces of Lego, it will have cost a lot less than you paid for yours ? Alex Captain Obvious to the rescue again
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Post by Deleted on Mar 5, 2010 2:54:42 GMT
Phil Even if Jeff's DAC doesn't quite beat your pieces of Lego, it will have cost a lot less than you paid for yours ? Alex Captain Obvious to the rescue again Phil I hope you realise that you will need to upgrade the rest of your system to show it at it's full potential ? Better start saving now ? Alex
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Spirit
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Post by Spirit on Mar 5, 2010 3:41:35 GMT
Phil I hope you realise that you will need to upgrade the rest of your system to show it at it's full potential ? Better start saving now ? Alex Thankfully there aren't any properly matured SD card-based transports yet Will has a pair of the linear devices (for Class A) stashed away for me ;D We'll see how the 701s are too...
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Post by r1a2s3t4o5 on Mar 5, 2010 9:42:03 GMT
Morning Alex, You had coffee yet or am I going mad. What the.... Doesn't the CVXO require a 3.3V supply, i can't picture what you're suggesting. Will... currently I have one dual 3.3V Cricket board in use. One Cricket supplying the CVXO which I've linked via short wires to the where the Xtal was removed from on the DIR9001 receiver board. Actually wired to where the bottom 33pf ceramaic cap was. The other 3.3V Cricket is being used to supply the 3.3V input of the DSD1796 DAC chip exactly as described by Alex. I also have a JLH PSRR on the 5V supply to the receiver board. My plan is to test the other dual 3.3V/5V Cricket board using the 3.3V one to supply the DIR9001 chip, 3.3V Reg4 removed, 100uf oscons used currently for decoupling reduced to 10uf to avoid and potential for the LME49710 apamp used in the Cricket to oscillate. The 5V one will then be used to supply the 5V inputs of the DAC chip, 5V Reg5 removed. With these changes, there probably won't be much value in retaining the JLH on the 5V supply to the receiver board. Firstly if these Crickets work for these applications, and secondly if they add anything to the already fanatastic SQ I'm hearing, this SC-DAC could well be turned into a DAC giant killer. cheers.. Jeff So You use JLH to get clean power. What are crickets for? Maybe I've missed something in this thread or my english isn't good enough (google doesn't help either with crickets). Can You post some link to schematic ? I'm in process of building new oscilator circuit board, by using Epson SG-8002 OTP oscilator attached to input board and I'd like to have clean 3.3V for DSD1796 and DIR9001 as well.
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Post by Deleted on Mar 5, 2010 9:54:47 GMT
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Will
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Post by Will on Mar 5, 2010 12:40:50 GMT
Unless I build that Balanced AK Class A that keeps tempting me!
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Post by jonclancy on Mar 5, 2010 16:43:42 GMT
Artwork? ?? ;D
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Post by Will on Mar 5, 2010 16:56:58 GMT
Nah, just bung 4 boards in that huge case of mine ;D
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Post by jeffc on Mar 6, 2010 7:50:46 GMT
Update "One small hop for Cricket, one giant leap for SC-DAC SQ" Last night I connected another 3.3V Cricket supply for the DIR9001, Reg4/diode removed as described above..... well this has added microscopic resolution... fantastic detail/nuances exposed... and instruments/sounds are so much more clearly separated from the mix ...... terrific. These Crickets really are living up to their "Little Miracle Workers" moniker. Only possible downside a teensey weeney drop-off in bottom-end weight, bass tunefulness still a plenty, but this might be due to the capacitance close to the DIR9001 chip being reduced from 100uf to 10uf rather than the Cricket insertion. One more 5V Cricket for the DAC chip supplies left to connect now. ;D I wonder what this will bring? Maybe OMG . Quite proud of myself adding these one at a time and having a decent listen in between rather connecting all in one go, which I was oh so tempted to do. cheers.. jeffc
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Post by Deleted on Mar 6, 2010 8:43:09 GMT
Jeff Seeing that the 5V from the Cricket will be derived from +15V via the JLH, perhaps you should try relocating your 5V JLH, to in line with the +5V that supplies the Optical and SPDIF inputs on the Input PCB.This MAY be beneficial with respect to derived data feeding the DIR9001 ? Alex
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Post by leo on Mar 6, 2010 10:06:19 GMT
The regulation quality for CS8412/4 and 6 used to have a noticeable effect on performance especially on its analogue supply so I'd imagine the DIR9001 would be the same
Looks like the reg for the DIR9001 also supplies the DSD1796's vDD supply, I'd isolate the dacs 5v vCC and 3v3 vDD supply keeping the DIR9001 on its own line
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Post by leo on Mar 6, 2010 10:13:05 GMT
Jeff Seeing that the 5V from the Cricket will be derived from +15V via the JLH, perhaps you should try relocating your 5V JLH, to in line with the +5V that supplies the Optical and SPDIF inputs on the Input PCB.This MAY be beneficial with respect to derived data feeding the DIR9001 ? Alex I'd be very surprised if not tbh
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Post by alchemy on Mar 6, 2010 10:29:51 GMT
"Quite proud of myself adding these one at a time and having a decent listen in between rather connecting all in one go, which I was oh so tempted to do. cheers.. jeffc" It pleasing to see the gentlemen have arrived, for the performance, congratulations Alfred
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Post by Deleted on Mar 6, 2010 10:36:43 GMT
Jeff Seeing that the 5V from the Cricket will be derived from +15V via the JLH, perhaps you should try relocating your 5V JLH, to in line with the +5V that supplies the Optical and SPDIF inputs on the Input PCB.This MAY be beneficial with respect to derived data feeding the DIR9001 ? Alex I'd be very surprised if not tbh Leo I was thinking especially of more accurate timing from the 74HCU04, as well as less noise from the Toslink and SPDIF areas. Alex
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Post by leo on Mar 6, 2010 10:40:51 GMT
I'd be very surprised if not tbh Leo I was thinking especially of more accurate timing from the 74HCU04, as well as less noise from the Toslink and SPDIF areas. Alex Just looking at the schematic, talk about skimping on the regs at least its not too hard to improve
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Post by Deleted on Mar 6, 2010 10:43:02 GMT
The regulation quality for CS8412/4 and 6 used to have a noticeable effect on performance especially on its analogue supply so I'd imagine the DIR9001 would be the same Looks like the reg for the DIR9001 also supplies the DSD1796's vDD supply, I'd isolate the dacs 5v vCC and 3v3 vDD supply keeping the DIR9001 on its own line Leo We have already fixed the 3.3V supply to the DAC (VDD) with the 1st Cricket. 5Vcc is derived from +15V via a JLH ,then the DAC PCBs own 5V regulator, (7805) Alex
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Post by leo on Mar 6, 2010 10:44:08 GMT
Even cheap op-amps could be used for the error amp in the crickets so it wouldn't be expensive to make quite a few of them
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Post by leo on Mar 6, 2010 10:46:32 GMT
The regulation quality for CS8412/4 and 6 used to have a noticeable effect on performance especially on its analogue supply so I'd imagine the DIR9001 would be the same Looks like the reg for the DIR9001 also supplies the DSD1796's vDD supply, I'd isolate the dacs 5v vCC and 3v3 vDD supply keeping the DIR9001 on its own line Leo We have already fixed the 3.3V supply to the DAC (VDD) with the 1st Cricket. 5Vcc is derived from +15V via a JLH ,then the DAC PCBs own 5V regulator, (7805) Alex Ok, obviously wrong jumping in this far of the thread, I'll bow out and let you carry on
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Post by Deleted on Mar 6, 2010 10:50:52 GMT
Even cheap op-amps could be used for the error amp in the crickets so it wouldn't be expensive to make quite a few of them Leo So when are you going to make some ? ;D The big 10uF could also be scaled down to 4.7uF if hard to obtain. The main thing slowing me down from making more is that I am having trouble getting more DP50 +VE Developer sachets. Alex
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