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Old 18th October 2012, 10:58 PM   #1211
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Quote:
Originally Posted by wktk_smile View Post
What version of firmware is required for si570 board?
Both V3.3x and V3.8x are OK. But if you want all the new features, the latest version is safer.

Ian
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Old 18th October 2012, 10:59 PM   #1212
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Thanks!

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
18. Slartibartfasst
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Old 18th October 2012, 11:17 PM   #1213
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Quote:
Originally Posted by qusp View Post
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 1V 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.
Kelvin connection and grounding layout are the key things for this reg to keep the low noise performance I think. Will see how it gonna be once get the PCB.

TPS7A4700 is a bipolar LDO, so XOs is supposed to be gain from it's low 1/f noise comparing with CMOS. Output programmable by jumpers. The whole PCB will be the heat sink.

Please give me a bit more details about the reg you mentioned.

BTW, for a AC based PSU, it will gain from LCR filter, however, for a battery based PUS, the L will increase noise at some frequencies point. I'm trying avoid using any L in my very low noise application now, such as a XO stage. What's your expericnce on the LCR filter? multi-stage?

Thanks

Ian
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Last edited by iancanada; 18th October 2012 at 11:26 PM.
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Old 19th October 2012, 01:53 AM   #1214
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Default Schematics and BOM of the passive battery management board

The passive battery management board is approved functional. I know its one of the best solutions providing clean battery based power for isolated clock board and DAC. So I decide to list it on the next GB.

Here I attached the schematics, BOM and PCB silk screen. The principle and schematic are very simple, I dont think I need making any note on it. Beside the standard configuration, there are a lot of optional functions, but you have to figure out by yourself.

In order to make sure everything is OK before the GB, Id like to provide 10 free PCB samples for evaluation. To save time for both of us, please list your ID on the list below by yourself if you decide to apply, and then at same time, send me an email at iancanada.mail@gmail.com with your apply number, diyAudio ID and shipping address. PCB will be shipped next week. Apply will be closed if 10 names on the list already. Please let us know your testing result.

Thanks

Ian
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File Type: png TOP.png (71.8 KB, 412 views)
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Old 19th October 2012, 01:58 AM   #1215
qusp is offline qusp  Australia
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battery board group testing

1. qusp

dont send ahead, send back with my stuff
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Old 19th October 2012, 01:58 AM   #1216
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Default Testing group list of free evaluation samples of passive battery management board PCB

Please list your ID below by yourself and send me an email with your apply number, diyAudio ID and shipping address at same time. With battery management board free sample on the title of email. Thanks

1. qusp
2.
3.
4.
5.
6.
7.
8.
9.
10.

(Apply will be closed if 10 IDs already on the list)
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Last edited by iancanada; 19th October 2012 at 02:11 AM.
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Old 19th October 2012, 02:20 AM   #1217
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Quote:
Originally Posted by iancanada View Post
[COLOR=black][FONT=Verdana]

1. qusp
2. bigpandahk
3.
4.
5.
6.
7.
8.
9.
10.

(Apply will be closed if 10 IDs already on the list)
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Old 19th October 2012, 03:00 AM   #1218
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Join Date: Dec 2009
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Battery management PCB testing group list:

1. qusp
2. bigpandahk
3.
4.
5.
6.
7.
8.
9.
10.

( will be closed if 10 IDs already on the list)

Thanks
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Old 19th October 2012, 03:55 AM   #1219
SPWONG is offline SPWONG  Hong Kong
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Battery management PCB testing group list:

1. qusp
2. bigpandahk
3. SPWONG
4.
5.
6.
7.
8.
9.
10.

Thanks.
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Old 19th October 2012, 04:09 AM   #1220
qusp is offline qusp  Australia
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Quote:
Originally Posted by iancanada View Post
Kelvin connection and grounding layout are the key things for this reg to keep the low noise performance I think. Will see how it gonna be once get the PCB.
yeah I use kelvin on my LT regs when I can, well only if there is significant lead length

Quote:
TPS7A4700 is a bipolar LDO, so XOs is supposed to be gain from it's low 1/f noise comparing with CMOS. Output programmable by jumpers. The whole PCB will be the heat sink.
oh sure, I think it'll be great, one isnt a replacement for the other

Quote:
Please give me a bit more details about the reg you mentioned.
OK, will email you some details

Quote:
BTW, for a AC based PSU, it will gain from LCR filter, however, for a battery based PUS, the L will increase noise at some frequencies point. I'm trying avoid using any L in my very low noise application now, such as a XO stage. What's your expericnce on the LCR filter? multi-stage?
yes, combination of series and parallel and i'm also playing with multiloop RC feedback around the opamp for it, thats what I wanted to do with my PCB.
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