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  1. H

    TTL 74AS IC

    www.jameco.com they are pretty good and will deliver in a few days.
  2. H

    Decision making before micro processors

    i found it.. a fan controller huh .. nice... thanks
  3. H

    Decision making before micro processors

    thats exactly what i was looking for ;D i cant read whats written under the circuit :( the mic-502 is an op amp?
  4. H

    Iron-on PCB's w/ photo paper

    this is sort of being discussed here http://www.electronics-lab.com/forum/index.php?board=21;action=display;threadid=192
  5. H

    Decision making before micro processors

    i need a circuit to turn a relay on and off. the relay controls 12 volt fans. the control condition is heat, which comes from my refrigerator, and the fans vent the heat away from the cooling fins. so when frige comes on i would like to have the fans come on shortly thereafter. and when the...
  6. H

    Playing with hydrogen

    this link is interresting. Hydrogen production by means of an Artificial Bacterial Algal Symbiosis (Project ArBAS) http://www.bionik.tu-berlin.de/institut/xs2solar
  7. H

    simple question

    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
  8. H

    RJ45 network card to IR

    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...
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    7805 overheat and Clock signal

    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...
  10. H

    LPT ->LCD + LED... how?

    yes in the attached circuit... *sigh* ok all i was saying was the circuit will work as pictured.
  11. H

    LPT ->LCD + LED... how?

    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..
  12. H

    Mystery object!

    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...
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    LPT ->LCD + LED... how?

    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.
  14. H

    Software as Hardware.

    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 ..
  15. H

    7805 overheat and Clock signal

    Thanks 8)
  16. H

    7805 overheat and Clock signal

    ps.. EDIT:: how do i post a circuit on this message board
  17. H

    7805 overheat and Clock signal

    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 ...
  18. H

    7805 overheat and Clock signal

    why do u have that transistor connected to the clock..what is its purpose..?
  19. H

    Software as Hardware.

    ante ,i tried running the spectrum analyzer..did not work did u try running it..?
  20. H

    Frequency generator to shut off street lights.

    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...
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