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  1. S

    LM317 circuit doesn't supply enough current (only 20mA)???

    Use ohm's law to check if you can get 100mA current you will need to connect a 0.9Ohm resistor accross output. I think by connecting one 1Ohm 1/2 Watt resistor at o/p you will be able to measure it.
  2. S

    Correct hall effect switch usage

    100mV won't be sufficient to turn on the transistor. Check the specifications of sensor again. If possible post a datasheet or number.
  3. S

    European applience in North America, question

    +-120AC dosen't makes it 240V but it is a 120V/Hz. '+' indicates Live & '-' indicates Neutral terminal. I think you shall need a transformer to switch down the voltage. & If you haven't blown up the appliance yet. Use a low value fuse to protect it ;D
  4. S

    no phase difference

    So do you basically need a phase corrector which would correct the phase of voltage despite of the changes in load? ???
  5. S

    my retro pvr .. or personal video recorder

    Winamp provides a plugin support which is used to display info on LCD. If the program you use for recording & playback supports plugins, you can run a check on their forums for the necessary software.
  6. S

    Floating Computer

    As you have voltage accross LED's 3.5V you can connect 3 of them in series & then parallel sections of three series LED's. This will reduce the value & power loss in the series resistor. :)
  7. S

    AM RECIEVER

    It is available here in India. So somebody must be producing it ;D
  8. S

    Correct hall effect switch usage

    Remove the transistor 2N2222 (connected to switch) & directly connect output of hall effect sensor to the point where emitter of that transistor was. The output current of hall effect sensor is not important here. Also make sure that you are operating the Hall effect switch sorrectly by...
  9. S

    Turn the lamp On & Off gradually...

    What you need is a PWM modulated by a Traingular wave of low frequency. Feed this PWM to a TRIAC through sutaible optocoupler (e.g. MOC3041). Check out it's datasheet at http://www.datasheetcatalog.com/datasheets_pdf/M/O/C/3/MOC3041-M.shtml it has some cool circuits.
  10. S

    Transformer ratings?

    Use this syntax Text you want to scroll Or you can click the button with scrolling M & type between the tags.
  11. S

    need help building a scmematic

    Your best bet is to use a microcontroller. A 20 pin will do the job & will cost less than discrete logic. You can use a CPLD also but then I don't know the prise factor.
  12. S

    Pressure sensitive switch

    Sandwhich a rubber pad between two metal plates. This will form a variable pressure sensitive capacitor. Much reliable than human finger :))
  13. S

    AM RECIEVER

    Hay you folks battling on theory - http://www.fas.org/man/dod-101/navy/docs/es310/AM.htm prateeksikka, Take a look at IC ZN414, it is the most simple way to build an AM receiver. It can catch a local AM station but don't expect to get BBC ;D (well unless you are in UK)
  14. S

    pcb

    what is PEN? Is it the stuff that I use to write things? ???
  15. S

    Car battery..........

    The battery is not a constant current source but it is a constant voltage source. The 12V/75A specifications mean that it will hold the terminal voltage to 12V for current form 0A to 75A. In practice you will not get exactly 12V over the range but voltage will be closer to 12V. So don't worry...
  16. S

    Garage door Status Indicator

    Here is a project http://users.cableaz.com/~cappels/dproj/LCRFLINK/LCRFLINK.htm. You can remove the microcontrollers and put a switch at i/p & LED at o/p and you can get what you need.
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    rounding off sq. roots

    I found this site - http://www.uwgb.edu/dutchs/PSEUDOSC/SquareCirc.htm BTW if you google with square root pi it will give you the result directly
  18. S

    The thickness of inner conductors differs?

    Ante, What you are refering to is the skin current effect. As the frequency of signal increses, more current flows along the surface. And the core carries lesser current. This effect occures at high frequency & there is a formula called depth penitration (or something similar ;D) for it.
  19. S

    op system

    well it's more like a penguine ;D
  20. S

    Problems with headphones... static?

    Check if your power supply is underrated try replacing it with one having higher wattage. Or there may be a problem on onboard sound ckt. try using a sound card.
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