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Re: smps ic selection
Linear
Application Note 66 power circuits
http://www.linear.com/pc/downloadDocument.do?navId=H0,C3,P1164,D4155
TI
Reference Design Cookbook Power Management Products
http://focus.ti.com/lit/ml/slub009/slub009.pdf
Power Management Selection Guide
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You will pay more for 2 phases soldering process
For the next time you can get small quantity SMT components from
http://www.digikey.com/
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http://www.mouser.com/
http://www.rs-components.com/index.html
Re: CAN code
I think its the MCP2515 job see datasheet page 15
3.3 Initiating Transmission
"Note: Setting the TXBnCTRL.TXREQ bit do
not initiate a message transmission....transmission will
start when the device detects that the bus
is available"
ISDN line level of +3v +1v –1v –3v represent the digital signals of 2 bit 00, 01, 10, 11
But its is an analog signal
I think signal is digital if it represents only “0” and “1”
Re: Obsolete part buying
The BIOS is standard flash memory IC and the IC manufacturer deliver it empty
the chip programmed by the motherboard manufacturer
Can you extract the BIOS from the motherboard?
If you can, try to get the HEX file and try to program the IC with IC's programmer, maybe...
Re: schematic
see the MPS EVALUATION BOARD EV7720DS-7782-00D 150W class D 5.1 Channel Audio Board
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or the Microsemi
LXE1722 6-CHANNEL EVALUATION BOARD
https://www.microsemi.com/catalog/parmlist.asp?P0_CAT=PM&P1_TYPE=AMAX
Instead of building you can buy the evaluation...
4x4 keypad decoder
Simple solution is to wake up the CPU for short time every 1 or 2 seconds with timer interrupt
To scan the keys if any key pressed
And if not, to send the CPU to sleep
Re: how do mp3 players work
some mp3 projects
http://www.pjrc.com/tech/mp3/index.html
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Re: flash memory
Yes some micro controllers can do it
I know that some of the Microchip 18FXXX family (18fxx2) can write data to the flash program memory on the fly
But not all of them
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