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by EUA
Sat Feb 11, 2017 3:30 am
Forum: General discussion
Topic: Scanner disappear after some seconds
Replies: 4
Views: 2071

Re: Scanner disappear after some seconds

I have same issue with vendor=0x04e8 [Samsung], product=0x3419 [SCX-4x21 Series] Indeed, problem not related with seconds after boot but after first scanimage call. First call stucks the scanner. Found the issue in this mail post: https://lists.alioth.debian.org/pipermail/sane-devel/2014-January/032...
by EUA
Mon Jan 20, 2014 10:50 am
Forum: Advanced users
Topic: Model A: How low can you go? (Power consumption)
Replies: 34
Views: 21455

Re: Model A: How low can you go? (Power consumption)

I don't know what is the difference with your setup.
Probably you attached some USB devices like WiFi, keyboard, hub etc that consumes the extra...
I do not attached the HDMI also. Just using serial line and a SD card. Using similar setup you need to see [email protected] on default RaspberryPI A.
by EUA
Wed Jan 08, 2014 3:54 pm
Forum: Advanced users
Topic: Running Raspberry on 3.3 V
Replies: 33
Views: 21728

Re: Running Raspberry on 3.3 V

I just wanted you know that: I run my Raspberry PI modal A with just 3.0v on 3.3v rail without any single issue. I removed 3.3v Linear Regulator and replaced with 3.0v step down. Work flawless AFAIK. Also my WiFi work with that setting. (Yes it's signal reception is dropped significantly but it's wo...
by EUA
Sun Nov 17, 2013 11:59 pm
Forum: Advanced users
Topic: Model A: How low can you go? (Power consumption)
Replies: 34
Views: 21455

Re: Model A: How low can you go? (Power consumption)

Hi, again me. In this time, I made a switch mode circuit with one TPS62420 buck converter. This converter is better choice for my project because it has 2 output instead of one. So you can directly feed both 1.8v and 3.3v rails from 5v rail. I use power save mode (not forced pwm) feature of chip for...
by EUA
Sat Jul 06, 2013 12:24 pm
Forum: Advanced users
Topic: Model A: How low can you go? (Power consumption)
Replies: 34
Views: 21455

Re: Model A: How low can you go? (Power consumption)

Hi there. Here is MSc computer engineer, thinking to change both RG1 & RG2 regulators at Modal A with %96 efficient TPS63000 converter that capable to do 4 mosfet synchronous buck/boost operation in SON10 DRC package. The device is so small, probably it will be similar size with RG2 including 2.2uH ...

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