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  1. MP1

    Voice Chips

    They are available at Futurelec, Jameco, and Digi-key. Probably quite a few other places as well. Hope it helps. MP
  2. MP1

    Please tell me whats a "STEPPER MOTOR" ?

    Anirudda, Here is a good tutorial on stepper motors. The page also has a list of manufacturers. http://www.cs.uiowa.edu/~jones/step/ Hope it is helpful to you. MP
  3. MP1

    Polar Capacitor as a Diode?

    aniruddha, If two, same-value, aluminum electrolytic capacitors are connected in series, back-to-back with the positive terminals or the negative terminals connected, the resulting single capacitor is a non-polar capacitor equal in capacitance to either of the original pair. The two capacitors...
  4. MP1

    Driving a HDD motor

    Sure, I agree this is a simple setup and that there are much more advanced circuits out there. OP stated that the author said it would work with a HDD motor and wanted to know if it was so. I am agreeing that there should be no problem in doing this. Author is clear on his site as to what motor...
  5. MP1

    MOVED: 3 Axis Contoller

    This topic has been moved to Electronic Projects Design/Ideas. This forum is only for discussion of projects in our projects section. http://www.electronics-lab.com/forum/index.php?topic=9750.0
  6. MP1

    please help me .

    Posted in the wrong forum. Moved here. MP
  7. MP1

    12V Fan controller

    Not really. There are several ways to achieve this. Basically, you just need to make a charge pump and proceed with the voltage requirements from there. If you use one of the voltage multiplier chips, you would use the 5 volt supply and configure it as a voltage tripler. For more current, the...
  8. MP1

    12V Fan controller

    Make a DC to DC converter. LTC1044, MAX1044 and ICL7660 voltage converter chips can do this for you. ...and yes, the 1000 uf capacitors are much too big for a device attached to a PC power supply voltage rail. They are most likely the cause for your 12 volt rail problem. MP
  9. MP1

    Free sample chips!

    Hi Arsal, Do you mean freeware? If so, try www.download.com There are lots of freeware sites that have software that is free of charge. This is only one of the many. If you mean duplication of copyrighted software, these cannot be posted to this site. MP
  10. MP1

    Driving a HDD motor

    The author has been using this circuit in excess of 2 years in robots he builds. I see no reason to rumor that it does not work. MP
  11. MP1

    EMC Question

    Stew, I guess it depends upon the strength of your signal. You are in the Maritime Mobile and the Aeronautical Radionavigation frequencies. Not a good idea to interfere with these. MP
  12. MP1

    Transferring artwork on to a PCB

    shaiqbashir, The photo copier mention was using a laser copier and not the inkjet types that have recently become popular. The toner has to melt to the board. The magazine paper keeps the laser toner from adhering to the paper so that it can easily stick to your board. Inkjets are great if you...
  13. MP1

    Transferring artwork on to a PCB

    You need a laser printer to do that. The toner will melt to the copper. Ink will not do this. MP
  14. MP1

    What can i do with LM393

    LM393 is a comparator. You can do lots of things like trigger voltage set points for relay control. If you have a bunch of them, you can duplicate circuits that use LM3914 chips. Here are some comparator applications: http://home.cogeco.ca/~rpaisley4/Comparators.html Here are some others...
  15. MP1

    Stun Gun from Camera Flash

    http://www.uoguelph.ca/~antoon/circ/hv/stungun/stungun.html Posted from University of Guelph. For educational purposes only. Note that stun guns do not harm people. This can only be done by an idiot who gets his hands on one. Stun guns have no intentions at all. Take care with this project...
  16. MP1

    Motor

    The formula: HP = (V*I*Eff)/746)*5252 T= (HP /RPM) thus
  17. MP1

    Motor

    I don't think you have gotten any replies because this is pretty much a bogus question. Who could know how much tension is in the spring in this shade? You should contact the manufacturer or distributor and see if they have any torque specs. MP
  18. MP1

    SPAM problem

    Blocking IPs would block people who did not spam as well. MP
  19. MP1

    110v supply

    Not sure how much current you need from this, but you could use a capacitive divider in the same way you would use a resistive divider in a DC circuit. Two capacitors will divide the voltage and allow you to tap off at a lower voltage as needed. The formula is Vout = Vin*C1/(C1+C2) where C is in...
  20. MP1

    timered 12v Fan

    Here is a timer circuit that will control a relay after a pre-determined interval. You can choose a time between  30 seconds and 24 hours. Hope that is what you are looking for. MP
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