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Everything posted by surajbarkale

  1. http://www.allaboutcircuits.com/vol_3/chpt_4/12.htm try googling with term "current mirror" only place where i have seen such a construct. Then i am not that experienced ;D
  2. Please be more clear. Post a sketch if you can.
  3. Perhaps you could try using a 500kv spark insted of normal flash light ;D ;D ;D ;D ;D
  4. How & where r they used? I don't think anyone would put a uC in a 4 pin package. Probably some ASIC ::)
  5. the posted link is not accessible can anybody else access it?
  6. What's cooki'n dok? ;D hope this helps http://repairfaq.ece.drexel.edu/REPAIR/F_micfaq.html
  7. If PS2 Keyboard & Mouse are used then The device provides a clock & a data line (similar to I2C check http://www.networktechinc.com/ps2-prots.html.) So we have to switch only the data line. By buffering the clock line to both PC's we can insure that PC assumes a device is present on that port. But the problem dose not end's here. The switching must be done when the device is not transmitting anything to PC. So probably a microcontroller should be used to receive signals from kbd & mouse and route them to appropriate PC. That way one can impliment Hotkey for switching from one system to another. As far as video signal is concerned I would like to see a post from a person who has done video multiplexing. So all ye Electronics Video God's out there plz listen to the prayer of this child & shower us with video mux circuits ;D ;D ;D
  8. Ante you are right :) Check out http://auto.howstuffworks.com/question396.htm. It would be interesting to see what electronic they use to measure the short intervals involved. ;D
  9. In the first moon mission they put up a mirror on Moon. It was used to measure the distance between Earth & Moon accuratly by bouncing a LASER back from that mirror. As the speed of light is tremendous (3*10^9m/s) you can not use LASER to measure small distances. Maybe you can measure above 500m. But I am not sure.
  10. Eagle is much like the vi editor irritating to learn but extermely powerful when learned ;D I am now trying to learn the user language programming in it seeing all the other kool utilities on their site
  11. You can use File->CAM Processor menu in board to generate all the data you need. If you have downloaded eagle manual pdf file then you can read a few pages from page 210 onwords to get an idea how it works. There are sample CAM Jobs in CAM directory inside eagle installation directory which you can view. I too don't know how to export eagle files in IDF format. I use the CAM Processor to generate PS files which i can convert to PDF for making films. This works gr8 with my film-maker too. ;D. A word of caution - The default silk generated by eagle is only 5mils you can run silk2.ulp to generate a wider silk screen if your boardmaker demands it.
  12. First of all i am sorry because i have posted a half-cooked link. The link to bas file is not working >:(. I didn't checked that link prior to posting. Anyway, the AVR used AT90S4433 has in built 6 channel ADC. So accepting analog voltage is no problem. (however atmel recommends you use Atmega8 insted of it).
  13. Usually the COM2 port of a computer can perform the IRDA function. (tht is your IR data link) on most laptops IRDA port is directly available but on a PC you would have to change your BIOS settings to make COM2 ready for IR link &b ofcource you would need a suitalbe connector.
  14. Sorry if i confused you but i have found a better link :D http://www.qsl.net/zl1bpu/micro/SerialDVM/AVRDVM.htm this projects uses Atmel AVR uC i could not find one using PIC sorry :(
  15. Found some info abt magnetic reed sw here http://www.allaboutcircuits.com/vol_4/chpt_4/2.html but there is no diagram to illustrate it :(
  16. I don't know about the standalone fax macine but if your modem is data/voice/fax modem then you cam connect it directly to send & receive fax. Windows xp supports such operations directly.
  17. You need an ADC & a microcontroller if you want to put data through USB or serial port. However for parallel port you can get away by using ADC & some logic chips. The selection of ADC will depend upon the resolution you want you can use any 10bit or 12bit ADC with integrated mux for the inputs. You will also need an attenueator at the input to protect ADC. This is very similar to a Data Acquizition System take a look at http://www.geocities.com/hagtronics/pic_das/
  18. Now that you are mentioning the sparks, i have a story to tell ;). Some years ago in a magazine named Electronics For You (in India) i read an article. It was about making a solder gun from a normal wooden pencil. The recipe was like this. You will need a 12V/1A DC power supply (filtering is not required). Take a wooden pencil attach one terminal of the power supply to one end of the pencil (to the lead inside it). And attach other terminal of power supply to the solder metal. Now trim the other end of the pencil to suit your needs. When you connect that end to the solder metal, it melts. I tried it out it was working fine until i accidently burned one BC547 by touchin base wth one lead & collector with another ;D . I stopped using it at last when i fried some more parts ;D So if it sparks take care
  19. http://cnyack.homestead.com/files/afourse/fs-io-tr.htm
  20. The effective voltage generated by a PWM is directly proportional to the Duty Cycle. The relation is - Ton * Vpeak Veff = ---------------------- Ton + Toff The DC motor can be controlled by using this voltage. However this is not the case with stepper motor. If you need more torque, you should put more current into the motor (without burning it ;)).
  21. I had same problem posting one ckt.JPG file when i changed it to ckt.jpg it worked! The routine which checks file extensios may be case sensitive (& windows is not) )so if you are using windows always double check the extension. ;)
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