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Old 26th September 2012, 07:42 AM   #1071
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Quote:
Originally Posted by AR2 View Post
I am sure it was mentioned somewhere before, but for a late bloomers.... is there any source for rubber rings that you guys could recommend?
Thank you
I bought some nature rubber o-ring for the clock board. Photo at post #108 - Build Thread for TPA BIII + Ian Async I2S FIFO + OPC NTD1 + Salas SSLV

Drop me a PM and I can send you some.
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Old 26th September 2012, 01:13 PM   #1072
GOR3 is offline GOR3  United States
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Default LED Current

Ian, I am finally getting to the case work. Regarding the LEDs to indicate "locked" and the source selected (TTL, Coax, Optical), can the board power 20mA LEDs, or should they be low current types (i.e., 2mA)?
Thanks,
George
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Old 26th September 2012, 11:46 PM   #1073
qusp is offline qusp  Australia
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why would you want a 20ma LED in a low noise environment? I presume its blue or white too? these are the highest noise too. very doubtful it would run it, not many receiver/logic chips have power for 100mA in LEDs...

the noise isnt a huge deal, but it all adds up, just seems unnecessary. do you know how annoying blue LEDs that bright are?
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Old 27th September 2012, 12:52 AM   #1074
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Quote:
Originally Posted by GOR3 View Post
Ian, I am finally getting to the case work. Regarding the LEDs to indicate "locked" and the source selected (TTL, Coax, Optical), can the board power 20mA LEDs, or should they be low current types (i.e., 2mA)?
Thanks,
George
Quote:
Originally Posted by qusp View Post
why would you want a 20ma LED in a low noise environment? I presume its blue or white too? these are the highest noise too. very doubtful it would run it, not many receiver/logic chips have power for 100mA in LEDs...

the noise isnt a huge deal, but it all adds up, just seems unnecessary. do you know how annoying blue LEDs that bright are?
Thanks qusp,

The current limitation resistor on the s/pdif board is 1K for each LED. So, theoretically the current limitation would be 3.3mA. Roughly, if your LED is 2V, the working current will be 1.3mA . Small enough? Recommend high light version LED with color other than the white and blue.

Ian
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Old 27th September 2012, 02:25 AM   #1075
qusp is offline qusp  Australia
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ya, I havent gotten around to casework that advanced yet, so didnt quote actual levels, but was pretty sure 20mA wasnt on the cards =) forgot about that schematic you posted
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Old 29th September 2012, 01:38 AM   #1076
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PCB order placed. Hopefully I can get all of the PCB samples by the end of next week. They are isolator, passive battery management and the Si570 clock board.

Ian
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Old 29th September 2012, 01:44 AM   #1077
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Ian, you are one unbelievably productive man!
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Old 29th September 2012, 09:03 AM   #1078
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Ian please keep us updated on the battery management board as well! I'm definitely interested.
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Old 29th September 2012, 09:29 AM   #1079
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I'm looking forward to see the reports from testers!
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Old 30th September 2012, 03:46 AM   #1080
AR2 is offline AR2  United States
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Quote:
Originally Posted by bigpandahk View Post
I bought some nature rubber o-ring for the clock board. Photo at post #108 - Build Thread for TPA BIII + Ian Async I2S FIFO + OPC NTD1 + Salas SSLV

Drop me a PM and I can send you some.
Thank you bigpandahk,
no need to bother you. I have a source here and I already ordered a few. I appreciate it very much that you are willing to send.

Best
AR2
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