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Old 20th February 2012, 09:11 PM   #1
UV101 is offline UV101  England
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Default SMD Regulator identification

Not the normal PSU topics but........

Can anyone help me identify these SOT23-5 regulators?

3.3v marked 3A29S
5v marked 9BME

I know what they are and the pin outs, but I'd really like to id and find the specs to see if its worth swapping them to lower noise versions.

Thanks

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Old 21st February 2012, 07:05 AM   #2
RJM1 is offline RJM1  United States
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I can’t say that I recognize those regulators, but +5V and +3.3V are usually used to power digital circuits and not analog signal processing. If this is the case then lower noise regulators won’t help your audio signal quality.
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Old 21st February 2012, 07:22 AM   #3
UV101 is offline UV101  England
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These regs are for the DAC (5v) and the clock logic (3.3v) in the squeezebox touch.

I've already replaced them with large low noise regulators with positive effect. I would like to identify the originals in order to see if something like the LP2985 which is pin identical but includes the option for the bypass cap for ultra low noise operation might be a significant step up from the standard regs.
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Old 21st February 2012, 12:27 PM   #4
marce is offline marce  United Kingdom
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Got any scope shots of the imporved power supplies and there effect on the digital circuitry?
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Old 21st February 2012, 12:41 PM   #5
UV101 is offline UV101  England
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Sorry, no scope shots. Just used a couple of my discrete regs and listened.

Really interested in ID'ing these devices!
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Old 21st February 2012, 06:48 PM   #6
marce is offline marce  United Kingdom
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I've just got a squeezebox, but at the moment I am wary of messing with it. I think I will wait till the warranty runs out first.
Had a look around, they look like fixed output LDO regs, but with quite a few firms doing them its hard to tell who's they are. With the selling price of the Squeezebox, I should imagine the electronics parts BOM will be quite restricted for cost. I'm curious to who manufactured them, cost of power supply parts is usually a good sign of overall quality of parts.
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Old 21st February 2012, 07:29 PM   #7
UV101 is offline UV101  England
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Don't worry, plenty to do in it!!
Click the image to open in full size.

Check some of the details here
http://forums.slimdevices.com/showthread.php?t=91794
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When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk
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Old 22nd February 2012, 12:17 PM   #8
marce is offline marce  United Kingdom
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Cheers, I'll have a read through that forum.
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Old 22nd February 2012, 06:20 PM   #9
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Why are you using RCA version?
Attached Images
File Type: jpg M_touch5.jpg (130.5 KB, 70 views)
File Type: jpg M_touch4.jpg (146.0 KB, 69 views)
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Old 22nd February 2012, 07:03 PM   #10
UV101 is offline UV101  England
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Quote:
Originally Posted by stormsonic View Post
Why are you using RCA version?
On the list!!! Initial tests were based on how far the onboard DAC could be pushed.

I'd really appreciate if someone has an SMD codebook and can ID the regs in post 1.

Thanks
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When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk
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