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what voltage you want to make from 3V ? you shoud read datasheet of parts you mentioned to make sure that the input voltage is appropriate for them.you mean you want switching power supply?
never think that way. in the worst case one hasn't tried hard enough, so it is not a question of smartness at all. tell what you have done till now, I hope it is a big list.
first begin with interfacing your 8051 to serial port, you can use this to debug your programs on 51. after learning RS-232 you can move to parallel and interface your 51 to computer parallel port for faster communications. at the same time you may like to learn more about programming because...
to asic1984: do you plan to write a communication software youself or you want to use a specific software for communication? if second case is true, name your software.
Data Acquistion
the most difficult part of usb is driver development. does your serial->USB have pre-written driver or you plan to develop one yourself ?
although there are some programs that require exotic geometries to communicate, but it is not common, parallel ports can cmmunicate happily on 1->1 proportion as I said earlier.
what OS do you use ? if it is win 2000/XP first you need a driver. you have the option to write it yourself(if you are an expert programmer) or you may find free drivers in internet. it also deponds on whether your parallel ports are bidirectional or not ?
if they are bidirectional, one computer...
Data Acquistion
there are AVR and 51 family of mcus with built-in usb and 10 bit 8 channel ADC. you mean every channel has about 5KHz bandwidth?if that's so and you want to reproduce the wave form on the computer, rs-232 is not a good choice. anyway I would usb. the actual version of mcu...
I went to the site and searched for PCL841. PCL841 is a PC interface card which communicates with CAN controllers, it has nothing to do with RS-232. you can use this card to communicate with microcontrollers that have CAN controller. are you a windows programmer I mean do you have Visual Basic...
short circuit usb port
I think you can't rely on that and you shouldn't. every manufacturer has its own way. what you can rely on is usb protocol standard and hardware specifications required by usb protocol.in that way even if one motherboard couldn't supply the maximum current, it is not your...
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