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hi,
I'm designing a USB A 2.0 interface. The goal is to put a connector on the board. The signals are coming from a PC-motherboard, USB header.
This is about the EMI / ESD components; what has to be first / closest to the connector? The EMI components or the ESD components?
On my schematic I...
sd to usb chip
Hi,
I'm planning to make a USB SD Cardreader.
Does anybody know what kind of chip is (mostly) inside those cardreaders?
Do you know any brands of those chips?
Anyone did such a project before?
best regards
The analog ground..
The datasheet states that you put a 10µF tantalum cap close to the chip on the supply. However by doing this, you actually couple noise from the 12V line to the AGND line, thus the audio signal...
Added after 40 minutes:
Another question:
On the LM4952, there is a...
Hi,
the best results (= noise is gone) I have when I don't connect the POWER_GND lead, in other words the amplifiers ground = the audio ground. So only the 12V lead from the PSU is connected and the ground from the PSU is not connected.
But when I put a big cap over the 12V line to ground, all...
Hi, I will try connecting the amplifiers ground pin to the PC motherboard.
I allready tried a LC filter in the 12V line, this didn't help.. My guess is that you have to have a way too large coil (L) to make a low pass DC filter..
I'll keep you posted
When I supply my amplifier with a separate DC supply, all the buzz noises are gone.
What do you mean by pseudo differential input?
The analog input grond signal is put in a star configuration, it's only connected from the PC motherboard to the LM4952 large ground tab, as stated in the...
Hi,
I've designed a small amplifier for a PC. It's built around the LM4952.
The PSU is a PICO-PSU:
**broken link removed**
This Pico-PSU also supplies the SATA harddisk and DVDRW drive.
The problem I experience is that I hear the noise/buzz from the motors of the harddisk and DVDRW throught...
The application will be a portable braille decoder for visual impaired students. So basically it includes:
* keypad scanning
* battery management
* LCD driving
* printing
* (wireless) communication with a PC
* writing data to memory and SD card interface
Hi,
thanks for your reply.
I notice some of these boards have a BTUART (bluetooth UART). Can you give some more explanation about that? What kind of chips are to be interfaced with that ? Is that just TxD, RxD and GND ?(How) Is data sent serially?
Hi,
I just wanted to ask the designers here who's had some experience in designing an application with such a module? It's a sort of mini computer based on an intel X-scale processor running Windows CE.
An example X-board from kontron:
**broken link removed**
Do you know other such boards? I...
Hi,
I am designing a portable device that will run on batteries.
What type of batteries would you generally recommand? Capacity (battery life) is most important factor.
regards
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