Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 121

qusp · 18th October 2012, 03:49 AM

the battery voltage drop is not such a big deal, I cut my A123 higher than that though, my circuit cuts at 3.15, theres not much left after that anyway, drop is pretty fast from 3.15-3, about as quick as the initial drop from 3.6-3.45vdc.

I have to say, much as I like that new LDO; it looks great and good current capability, but how about making a small flexible low noise reg that others could use in various positions? using your layout skills, which are considerable as we know, a small high performance flea type reg could be realised.

basically a buffered flea type, a higher current version of Ackos regs. I have been using something like this for my clock, made from a ltc6655 reference + LCR filter feeding one of opc's SE-SE 'the wire' headphone amps which is made from LME49990 + LME49600.

it needs a bipolar supply unless its an isolated load, so not at all efficient in that way, not low dropout, but copes with power up to +/-18V for even 1.2v output. Most will have a bipolar supply somewhere in the case to power it with.

What you end up with is VERY low noise across a wide bandwidth and will do 250mA without a heatsink apart from the PCB at low voltages

with this we are down in the nV range, not sure exactly what noise but pretty darn low, much less than 1µV with the right LCR filter, probably less than 500nV and maybe much less. ive been playing with some ideas for a layout of my own, i've been just using a separate reference circuit feeding one of the cheap SE-SE boards that had an error Owen was selling, but something small and neat will be better.

NicMac · 18th October 2012, 06:35 AM

Si570 interest list:

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. NicMac - as usual!

Zoran · 18th October 2012, 07:11 AM

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. NicMac - as usual!
15. Zoran

PET-240 · 18th October 2012, 09:24 AM

Si570 interest list:

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. PET-240

hochopeper · 18th October 2012, 09:26 AM

Fixed it for you Drew

Si570 interest list

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. NicMac - as usual!
15. Zoran
16. PET-240

coolhead · 18th October 2012, 02:03 PM

Sorry, was not fOllowing this for some time, I don't see any price on this, any idea? Anyway put my name in first, don't want to miss the good thing.

Si570 interest list

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. NicMac - as usual!
15. Zoran
16. PET-240
17. Coolhead

qusp · 18th October 2012, 02:11 PM

no, dont know price, but given Ians modules are usually effectively charity I dont think its anything to stress about...

coolhead · 18th October 2012, 02:18 PM

Wow, quite a lot of upgrades, don't know should I mail back my old board (first version) for upgrade or should get get a new one, any suggestion?
I am definitely interested in the battery control board, need to look at more post to see what is needed to do in a single shipment.
Thanks you.

qusp · 18th October 2012, 02:31 PM

the isolator is not yet available, only 10 prototypes were sent out for testing, mine arrived today and looks good! It came complete with complementary resistor networks, Ian's generosity and productivity seems limitless! the battery board is again in prototype stage and none of these are upgrades, but separate modules so there would be no point sending it back unless you want the firmware upgraded

wktk_smile · 18th October 2012, 04:01 PM

What version of firmware is required for si570 board?

18th October 2012, 07:11 AM	#1203
Zoran diyAudio Member Join Date: Jan 2004 Location: Belgrade	1. bigpandahk 2. tagheuer 3. hochopeper 4. qusp (of course) 5. AR2 - definitely! 6. wktk_smile 7. hirez69 8. CeeVee - you bet! 9. number9 10. analog_sa - GB maniac 11. edbk 12. atom6422 13. misterrogers - Of Course! 14. NicMac - as usual! 15. Zoran __________________ ###

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18th October 2012, 03:49 AM	#1201
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	the battery voltage drop is not such a big deal, I cut my A123 higher than that though, my circuit cuts at 3.15, theres not much left after that anyway, drop is pretty fast from 3.15-3, about as quick as the initial drop from 3.6-3.45vdc. I have to say, much as I like that new LDO; it looks great and good current capability, but how about making a small flexible low noise reg that others could use in various positions? using your layout skills, which are considerable as we know, a small high performance flea type reg could be realised. basically a buffered flea type, a higher current version of Ackos regs. I have been using something like this for my clock, made from a ltc6655 reference + LCR filter feeding one of opc's SE-SE 'the wire' headphone amps which is made from LME49990 + LME49600. it needs a bipolar supply unless its an isolated load, so not at all efficient in that way, not low dropout, but copes with power up to +/-18V for even 1.2v output. Most will have a bipolar supply somewhere in the case to power it with. What you end up with is VERY low noise across a wide bandwidth and will do 250mA without a heatsink apart from the PCB at low voltages with this we are down in the nV range, not sure exactly what noise but pretty darn low, much less than 1µV with the right LCR filter, probably less than 500nV and maybe much less. ive been playing with some ideas for a layout of my own, i've been just using a separate reference circuit feeding one of the cheap SE-SE boards that had an error Owen was selling, but something small and neat will be better.

18th October 2012, 06:35 AM	#1202
NicMac diyAudio Member Join Date: Feb 2009	Si570 interest list: 1. bigpandahk 2. tagheuer 3. hochopeper 4. qusp (of course) 5. AR2 - definitely! 6. wktk_smile 7. hirez69 8. CeeVee - you bet! 9. number9 10. analog_sa - GB maniac 11. edbk 12. atom6422 13. misterrogers - Of Course! 14. NicMac - as usual!

18th October 2012, 09:24 AM	#1204
PET-240 Contributor diyAudio Member Join Date: Feb 2010 Location: Brisbane Northside	Si570 interest list: 1. bigpandahk 2. tagheuer 3. hochopeper 4. qusp (of course) 5. AR2 - definitely! 6. wktk_smile 7. hirez69 8. CeeVee - you bet! 9. number9 10. analog_sa - GB maniac 11. edbk 12. atom6422 13. misterrogers - Of Course! 14. PET-240

18th October 2012, 09:26 AM	#1205
hochopeper diyAudio Member Join Date: Feb 2009 Location: Brisbane, Australia	Fixed it for you Drew Si570 interest list 1. bigpandahk 2. tagheuer 3. hochopeper 4. qusp (of course) 5. AR2 - definitely! 6. wktk_smile 7. hirez69 8. CeeVee - you bet! 9. number9 10. analog_sa - GB maniac 11. edbk 12. atom6422 13. misterrogers - Of Course! 14. NicMac - as usual! 15. Zoran 16. PET-240

18th October 2012, 02:03 PM	#1206
coolhead diyAudio Member Join Date: Mar 2010	Sorry, was not fOllowing this for some time, I don't see any price on this, any idea? Anyway put my name in first, don't want to miss the good thing. Si570 interest list 1. bigpandahk 2. tagheuer 3. hochopeper 4. qusp (of course) 5. AR2 - definitely! 6. wktk_smile 7. hirez69 8. CeeVee - you bet! 9. number9 10. analog_sa - GB maniac 11. edbk 12. atom6422 13. misterrogers - Of Course! 14. NicMac - as usual! 15. Zoran 16. PET-240 17. Coolhead

18th October 2012, 02:11 PM	#1207
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	no, dont know price, but given Ians modules are usually effectively charity I dont think its anything to stress about...

18th October 2012, 02:18 PM	#1208
coolhead diyAudio Member Join Date: Mar 2010	Wow, quite a lot of upgrades, don't know should I mail back my old board (first version) for upgrade or should get get a new one, any suggestion? I am definitely interested in the battery control board, need to look at more post to see what is needed to do in a single shipment. Thanks you.

18th October 2012, 02:31 PM	#1209
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	the isolator is not yet available, only 10 prototypes were sent out for testing, mine arrived today and looks good! It came complete with complementary resistor networks, Ian's generosity and productivity seems limitless! the battery board is again in prototype stage and none of these are upgrades, but separate modules so there would be no point sending it back unless you want the firmware upgraded

18th October 2012, 04:01 PM	#1210
wktk_smile diyAudio Member Join Date: Dec 2009 Location: Kyoto	What version of firmware is required for si570 board?