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harsh

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Everything posted by harsh

  1. this link is interresting. Hydrogen production by means of an Artificial Bacterial Algal Symbiosis (Project ArBAS) http://www.bionik.tu-berlin.de/institut/xs2solar
  2. hi shekhar, Ideally it will blow the fuse in the ammeter .Unless somone puts aluminum foil over the fuse, because he doesnt have a replacement :o :o
  3. stuee, The HS/HST series are fabricated on a 2 micron advanced CMOS process which enables AC switching performance comparable to the standard HC/HCT logic families. However, HS/HST series have reduced output drive which yields significantly lower dynamic power consumption than HC/HCT. i got this off of http://www.fairchildsemi.com/ms/MS/MS-503.pdf ...page 4... i would say yes ,you can definatly use the HC part as a replacement for the HS part...
  4. i got this info on the site u just listed... i did not include the timing diagrams stated at the bottom of the last paragraph because well they werent really timing diagrams. Every 16.67ms (or about 60Hz), the SNES CPU sends out a 12us wide, positive going data latch pulse on pin 3. This instructs the ICs in the controller to latch the state of all buttons internally. Six microsenconds after the fall of the data latch pulse, the CPU sends out 16 data clock pulses on pin 2. These are 50% duty cycle with 12us per full cycle. The controllers serially shift the latched button states out pin 4 on every rising edge of the clock, and the CPU samples the data on every falling edge. Each button on the controller is assigned a specific ID which corresponds to the clock cycle during which that button's state will be reported. The table in section 4.0 lists the ids for all buttons. Note that multiple buttons may be depressed at any given moment. Also note that a logic "high" on the serial data line means the button is NOT depressed. At the end of the 16 cycle sequence, the serial data line is driven low until the next data latch pulse. The only slight deviation from this protocol is apparent in the first clock cycle. Because the clock is normally high, the first transition it makes after latch signal is a high-to-low transition. Since data for the first button (B in this case) will be latched on this transition, it's data must actually be driven earlier. The SNES controllers drive data for the first button at the falling edge of latch. Data for all other buttons is driven at the rising edge of clock. Hopefully the following timing diagram will serve to illustrate this. Only 4 of the 16 clock cycles are shown for brevity. SNES Controller Button-to-Clock Pulse Assignment Clock Cycle Button Reported 1 B 2 Y 3 Select 4 Start 5 Up on joypad 6 Down on joypad 7 Left on joypad 8 Right on joypad 9 A 10 X 11 L 12 R 13-16 none (always high)
  5. yes in the attached circuit... *sigh* ok all i was saying was the circuit will work as pictured.
  6. Obbelix,Please note :: i did not say that it would not work.. just that it may not work as planned.. also i see no problem wiring the circuit as you have it above... Great :) also good.. :) why? .. the chips that drive the LPT can easily handle two inputs each..
  7. the schematic would look the same as any other schematic.. the layout of the board would require software with different layers superimposed on top of one another..dont ask how they MAKE a multilayer board.. cuz i know not... but if u look at an old pc card , video or otherwise, hold it up to the light there is holes in it... those holes connect the layers...
  8. hmmm the circuit may not work as planned,because when u optput a logic one to the LS373 the output will be high , which in effect will turn OFF the LED.
  9. Ante , it was asking for a disk , but i got their circuit pgm which is nice.. :D it really isnt important that i get it working, but thanks ..
  10. ps.. EDIT:: how do i post a circuit on this message board
  11. i have a tip ... remove the npn transistor the 1 k resistor and the zenir diode. and generate a normal clock signal..or better yet take the clock from the circuit that is generating the serial data ...
  12. why do u have that transistor connected to the clock..what is its purpose..?
  13. ante ,i tried running the spectrum analyzer..did not work did u try running it..?
  14. the sensor in the streetlight is a cadmium sulfide photocell. this site says that the wavelength response of a cadmium sulfide photocell is 550 to 650 nm. http://www.chartlandelectronics.co.uk/pdfs/N5AC-501085.pdf this one says that an infrared laser diode has a wavelength of 785 to 830 nm.. http://www.photonic-products.com/products/receptacled_laser_diodes/rec_infrared.htm so the infrared option is a bit out of range of the cadmium sulfide photocell . did ya ever try a red laser pointer..?
  15. hehe ..her song.. i sampled tina turners Song .. :P
  16. if the sensor isnt facing your house your outta luck..if it is facing your house you could use your vampire powers ..and 'WILL' it to turn off :P :-*
  17. you could allways go to home depot and invest in some blinds.. $3.50 , problem solved
  18. hi all. i have a TRS 80 which worked fine the last time i used it. we bought it for $600 and another three hundred for the expansion board.. like i said it worked well ,but , the connectors on it were lead coated and had to be cleaned with an eraser,whenever it started acting up. i've used it to learn assembly language., Z80 hehe, and even hooked it up to a breadboard. At one point i sampled tina turner , i forget which song , it sounded really bad. that was because i wasnt sampling accuratly enough ,because the a/d had no track & hold and because the program controlled the conversion start(also not good for accurate conversions) anyway i guess the point of this rambling is, a computer is useful and fun no matter how old it is..
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