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  1. MP1

    Paint &electronics.

    Alun, That is not a datasheet. What you have posted is a "Sales Brochure". Where does it say the efficiency is derived from the color? There is simply not enough information in this document to make such a determination. MP
  2. MP1

    Paint &electronics.

    I will stand on my original comments.... BTW: The radiator theory is bogus. The black paint had nothing to do with heat. An unpainted radiator was ugly due to the way it was manufactured years ago. Black was the standard under the hood. The newer ones are manufactured differently and do not...
  3. MP1

    drag lights (christmas tree) pc board design

    There was a conversation regarding this in May 2004. Some schematics were also posted in that thread. It is here: http://www.electronics-lab.com/forum/index.php?board=10;action=display;threadid=841;start=0 MP
  4. MP1

    Looking For PWM Chip That Can Be Controlled From The Serial Port Of A Computer

    You will not find a micro with this many hardware PWM options, but you can configure any pin as a software based PWM. On a micro with a port A, portB, port C, and Port D, there are 8 pins per port. You would use the RX and TX for your communication. this would still leave you with 24 pins using...
  5. MP1

    Paint &electronics.

    You have that backwards....black actually absorbs heat. Put that black heat sink in the direct sun and watch the efficiency rapidly drop as opposed to to raw aluminum one. Anodizing on heat sinks was purely introduced for the color aspect. The buyer thinks it is cool to have color. Thus, more...
  6. MP1

    FM WAVE PROPAGATION

    Audioguru, When posting a modification of someone else's circuit, we should mention where the original came from and give the original author credit for his work, no matter how you feel about it. Would you post the original for all to see? Or at least give us a link? MP
  7. MP1

    Radio Frequency Communication (RF)

    I do not know if you can use 433 MHZ in your area, but in most places, there is no issue with licensing. Also, since you are going to transmit for a short distance, you do not need a lot of power. Have you considered using a dedicated chip? You might want to take a look at www.rfdigital.com to...
  8. MP1

    0-30 Vdc Stabilized Power Supply

    wulle, are you going to tell us about the bug that you have found or do we have to guees? MP
  9. MP1

    Measuring 10mV analogue signal

    Kevin, if he uses a micro with a 10 bit ADC, he will not have to divide the signal back down again. For example, he could amplify the signal to 1 volt, feed it into the ADC of the micro, and the numeric representation would be what he would use. This could then be formatted and sent to a display...
  10. MP1

    Looking For PWM Chip That Can Be Controlled From The Serial Port Of A Computer

    I do not know enough about the chips you already have used to make a comparison; but you can talk to a microcontroller through the serial port and you can certainly send out data bits to the port pins to control PWM devices. PWM is simply a matter of "ON" times vs "OFF" times. You would not need...
  11. MP1

    wireless transmitter

    tazmania_kid, Are you aware there are dedicated chips out there for transmit and receive circuits? They are somewhat expensive, but since you are connected with a University, you might be able to get samples. www.rfdigital.com has quite a few choices. I personally like the Lynx Technologies...
  12. MP1

    Help identifying a resistor and source

    It is a 4K7 ohm surface mount resistor. MP
  13. MP1

    Are There Any Dead Hex Readers In The Crowd?

    Hex: DEAD = 57005 (plug it into a scientific calculator and you will see)Plus you (one more) = 57006. "...if only you and "57005" people can read hex...." See the answer on the back of the shirt. I like it. Nice play on words. MP
  14. MP1

    CMOS based timer bouncing

    You might start with using a double sided board and use the second layer as a ground plane. This will clean it up a lot without re-design. MP
  15. MP1

    Measuring 10mV analogue signal

    You could make your own ADC with comparators. The more you string in line, the more resolution you will get. Well, up to a limit, of course. But then, since you are familiar with micros, why not just choose one which has a built-in ADC? 10 bit ADC is pretty common. MP
  16. MP1

    Electronic Stethoscope

    To all users on this thread.... ...Actually some users reported that the Electronic Stethoscope worked and others reported that they could not make it work. I see there are several posts in the Electronic Stethoscope 2 topic now going both ways as well. It is normal to have users with different...
  17. MP1

    Variable digital resistor???????

    It would be easy with a microcontroller, but perhaps you could use the 4066 as the heart of your system. MP
  18. MP1

    Upload error!

    Here is a solution: I have searched out a free file viewer for rar. Named 7-zip. It is attached. Unless someone has a better free viewer, I suggest we make this available on the site. I have tested this with XP and it does not interfere with the present zip file viewer. Since it comes as an exe...
  19. MP1

    Upload error!

    Perhaps on older operating systems. You do not have to install anything on XP to read zip files. It is pre-packaged. Sites which use txt, doc, pdf, bmp, gif, jpg, tiff, etc do not require the user to purchase anything. My question was: Is there a free rar reader? If so, lets post it on the site...
  20. MP1

    ExpressPCB Print Problum

    As far as I know, you cannot print from ExpressPCB. They want you to send them the files and let them make your boards. MP
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