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I used a very good and cheapest product, share again。
(If you are interested, you can contact me, we talked about, my mail is: :arrow: openmcusamuelhu(a)gmail.com) I have this product iattachment, interested can message me, tell me your mailbox, I sent to you directly.i am a old man,haha.
In the 1990's I programmed a lot of IBM-PC-like machines to do all kinds of things.
In the 2000's My career stalled out and I spent a lot of time unemployed.
Now in the 2010's, we are in a new world where computers fit in the palm of your hand.
If I want to remain viable as a working software engineer, I have to embrace the SOC's.

I have been looking for the board, and now I finally found it. I want the same as loving as I do research and development board to share my happy moment.
First talk about this board is roughly constituted:
On-board resources:
CPU: STM32F103RBT6, ARM Cortex-M3,maximum operating clock is 72MHz;
FLASH: 128K BYTES
RAM: 20K BYTES
1 X JTAG debug interface(the standard ARM JTAG 20)
4 X LED (one Power LED)
1 X USB to RS232 (PL2303 Based, you can download via USB line!!)
1 X USB2.0 Device mode interface.
1 X ADC input voltage adjustment potentiometer
1 X SD card socket(on the TFT module)
1 X 2.8 inch TFT (with touch screen) interface, can be controlled via MCU, FSMC 16-bit interface mode or 8-bit interface mode
4 X functional keys
1 X RTC with battery back-up battery holder (Battery is not included).
8 MHz crystal, 32.768kHz crystal
onboard 5V, 3.3V LDO 1117, the largest provider of 800mA current.
All GPIO port Lead out, easy for your ne system Application!
PCB Board Size: 82MM X 68MM
Rich in routines, not only functional modules MDK-board test-source: LED lights examples, RTC, USB, SD card, ADC, touch-screen test, TFT LCD screen test .....
but also there are successful transplantation UCOS2, UCGUI a number of routines can be directly applied to industrial control equipment or hand-held instrument of human-computer interface design, so that your product from the monotony of black and white, into the colorful world! Inspire your design inspiration!


Part2: Introduce for 2.8" TFT LCD Module
2.8" TFT LCD Module (ILI9325) with Touch Panel , the default i8080 16 bit parallel interface, optional 8-bit parallel interface mode. R7 open is 16-bit mode, R7 short is 8-bit mode (It's high 8 bit), can be directly used AVR, PIC, C51, ARM , STM32, etc. Microprocessor.
2.8" TFT LCD Module (260K 240*320 Color) with Touch Panel V2.0
1. Support SD Card;
2. Support DATAFLASH
3. Support 16/8 Bit Mode
4. With Touch Panel & Controller
5. Module can use 180 degree rotation

Before the share several products, there will always be people who send me an email, asking to buy links. I now out in the open, for your reference, You can go to eBay search Name: Development board MINI V3 STM32F103RBT6 (development board) with 2.8 "TFT-module。
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Datasheet/Parts requests / Re: Potentiometer
« Last post by audioguru on November 25, 2014, 08:31:49 PM »
I have never seen a bad ALPS pot and have never ordered one.
If the code had an "A" in it then it would have an Audio logarithmic taper. It has an "M" so it is a linear pot.
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Datasheet/Parts requests / Re: Potentiometer
« Last post by liquibyte on November 25, 2014, 01:29:28 PM »
I have a NEC amplifier that I am working on and need to find a source of Data Sheet for ALPS potentiometers to identify the value and old part numbers. This is all there is on the pot. 305F & 250KMN. The reading
I get is 195k but that is due to fact that the shaft is busted an cannot be turned. I assume value is
250K. Where do I go for a Technical Data sheet for ALPS?
I just did a search for "alps 250kmn" on Google and many of these pop up.  Is this a dual pot?  The 305F is probably the model number and I'm fairly sure the 250KMN represents the value with some sort of series being the MN part.  Pics of the part in question might help but you can usually get by with the same value and physical dimensions from another manufacturer.  Audioguru might be able to help more with this, I think that's the kind of thing he's into.  Anyway, these things are all over ebay.
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Datasheet/Parts requests / Potentiometer
« Last post by kbyrne on November 25, 2014, 12:56:08 PM »
I have a NEC amplifier that I am working on and need to find a source of Data Sheet for ALPS potentiometers to identify the value and old part numbers. This is all there is on the pot. 305F & 250KMN. The reading
I get is 195k but that is due to fact that the shaft is busted an cannot be turned. I assume value is
250K. Where do I go for a Technical Data sheet for ALPS?
5
Microelectronics / Re: Arduino good to start programming?
« Last post by liquibyte on November 24, 2014, 10:16:27 AM »
Will this be good to start in the programming world?
The computer you're on is a good start in the programming world.  Since you didn't ask if an UNO rev 3 would be good to start programming in the embedded world you got the first answer.  AVR's and PICs are ubiquitous in the industrial world and it's always a good thing to learn to program on them.  For hobby uses, the Arduino platform is pretty cool but eventually, if you're serious, you'll want to leave that behind and use a stand alone AVR or PIC programmer.  I used to work for a place that built industrial braking units and they used PIC's exclusively.
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Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by liquibyte on November 24, 2014, 10:03:35 AM »
I've been playing around with the output of U3 and have been noticing an oscillation.  After trying various values for C8 from 100n to 10p and caps across the 10V zener and R20 I was able to minimize this to a small spike.  On a whim, I removed C8 altogether and the oscillation went away altogether.  I guess my question would be is C8 entirely necessary if the output of U3 doesn't oscillate without it?

Edit: Nevermind, I think I answered my own question.  The output of the supply drops when C8 isn't there.
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Microelectronics / Arduino good to start programming?
« Last post by JoeCosta on November 24, 2014, 04:51:51 AM »
Hey fellows,

I think i'll be buying this: link removed.  An Arduino UNO rev 3.

Will this be good to start in the programming world?


Thanks
8
Projects Q/A / Re: Supercap charging
« Last post by hubble on November 24, 2014, 03:33:03 AM »
Thanks for your quick replies. How do I select the bridge rectifier and buck converter? I think the emf generated by the generator would be under 50v with the current carrying capacity of a few mAmps(I plan to use bipolar stepper motor instead of axial flux generator). I think the output of the converter would be 2.43v which is fed directly to the 400F supercap. Am I thinking in the right direction or are there other things that I need to consider? Here is what I am working to accomplish:

Generator-->Rectifier-->Buck Converter-->Supercapacitor-->Boost Converter-->Load (bunch of LEDs, etc.)

Thanks.
9
Electronic Projects Design/Ideas / Re: New Power Supply
« Last post by liquibyte on November 23, 2014, 10:49:27 PM »
I wonder if this is being caused by the zener.  I encountered something like it in the sim I was doing for the other supply.  The spike was cascading through the downstream components and took me forever to figure out.
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Electronic Projects Design/Ideas / Re: New Power Supply
« Last post by redwire on November 23, 2014, 10:32:13 PM »
Liquibyte  here are some results:  The blue line is the reference voltage to the voltage control op amp and Yellow is output voltage.

NewFile 3 is startup 12v, under load
NewFile 4 is startup 12v, no load
NewFile 5 is shutdown with load   (no load takes a long time to shutdown for scope)
NewFile 6 is startup 3-4v, under load

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