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  1. MP1

    LPT ->LCD + LED... how?

    Glad to hear you made it work! Yes, those are the correct pin assignments for the port, with the exception that base +2 is with pin #1. I think you have a typo with pin #0. Good luck with your project! MP
  2. MP1

    Temp. Sensor

    quantum, this is all explained in the data sheet that you have posted a link. The address pins are set up so that you can connect multiple sensors to the same communication bus and you will know which sensor you are reading. The other two pins, SCL and SDA, are the serial transmission lines...
  3. MP1

    Parts from stuff

    On your next salvage run, try solder wick and a solder sucker. They are great for this type of work. Here is also a tip: Get some liquid solder flux and put some on the solder pad before heating it up with the iron. It will speed up the melting of the solder and allow you to use the solder...
  4. MP1

    Connecting An Audio Output to 20 Headphones...

    Thanks for the congrats! MP
  5. MP1

    LPT ->LCD + LED... how?

    The 8 data bits of the LPT port are accessed with the port address or otherwise known as the base address. The other pins are accessed as Base +1 and Base +2 address. The LPT port address you are using of course is the base address. i.e.- LPT1, &H378, etc. I am doing this from memory, so I...
  6. MP1

    Hello everybody!

    GreekPIC, welcome to the forum! Can I assume from your user name that you are also a PIC microcontroller user? Or just a warning that you will be pic...ing brains? ;D ;D MP
  7. MP1

    LPT ->LCD + LED... how?

    obbelix, You can use the other pins of the parallel port to send data. Another way is to use one of the data bits to also light the LED. The data is sent at such a high frequency that an LED will look like a steady light. However, the LED will draw too much current from the data line unless you...
  8. MP1

    Paint &electronics.

    ...also, if the heat sink is actually doing some work, it will get hot enough to cause the paint to peel off. Not a good idea. Ante has a good suggestion with anodizing. Otherwise, if you do not need to actually change the color, you might be able to get that brushed aluminum effect with some...
  9. MP1

    Connecting An Audio Output to 20 Headphones...

    This has turned into a different subject, partly my fault as well. Let's make a new subject in the chit chat area if you guys want to continue with starter relays, etc. We are a long ways from headphones, eh? MP
  10. MP1

    Connecting An Audio Output to 20 Headphones...

    Sure, the data sheet must be followed. But somewhere in there you need to distinguish between advertisement and technical notes. I have heard you get on your soap box more than once about Watts ratings of power amps. Do you honor these manufacturer's specs? I think we both know that we are not...
  11. MP1

    power factor meter

    Here is the schematic. All you have to do is right click on the picture on their website and choose "Save Picture As". BTW...they have a pretty good sized website. In the future, you might get better help by posting a link to the article so that someone does not have to search through all of the...
  12. MP1

    Audio Signal Switch

    audioguru, Many microphones have a switch for low or high Z or can be set inside the device. A Dynamic microphone is not specifically a low Z device. I have several that are switchable with high Z or low. Nowhere in this thread did the original post specify a mic with a low Z. ::) BTW...89C51 is...
  13. MP1

    NEWB HERE!

    www.google.com Use keywords such as electronic, schematic, amplifier, tutorial. See what comes up from it. BTW...if you will not give yourself time to learn because all of your time is eaten up with dungeons and dragons, you will probably not do very well to learn this subject. Some aspects of...
  14. MP1

    Mystery object!

    It is not always to avoid multi-layer boards. You will also see this on many of the multi-layer boards. Some manufacturers use the same board layout for many different devices. In some cases, the resistor values will be different than on the other board models and in some cases, the resisotrs...
  15. MP1

    Parts from stuff

    Electronicshacker, if you desolder the parts using a heat sink and some solder wick, you will not have to throw away so many. Bending the leads until they break? Use your solder iron. You are damaging the part of the lead that is left on the part. How often do you find parts that do not work in...
  16. MP1

    Connecting An Audio Output to 20 Headphones...

    I am not convinced. But then I am basing what I say on actual applications with both and not someone's glorified data sheet. Besides, a mechanical relay has a life of X number of ON/OFF states. All materials used for contacts far exceeds this spec. That is, unless you abuse the specs. MP
  17. MP1

    ELM - Pocket Size MP3 Player

    Just a suggestion....For prototyping, I usually make a small pc board for all my surface mount chips which terminate to a standard dip socket pattern on the outer edges. This way, I only have to solder once and I can use the same chips over and over again in different design configurations. Of...
  18. MP1

    Latch triggering

    Kevin, the circuit starts at 0 potential, then the voltage rise of the first oscillation happens when the circuit is powered up. There is no phase control on an oscillator. It starts at zero then rises. This is the starting phase. If you are using multiple oscillators and they start up at...
  19. MP1

    Audio Signal Switch

    It is because you have not made the circuit correctly. You would have the same problem with a mechanical switch. I would not bother with 4066 or 4051 for high impedance audio signals, but the 4016 works fine. MP
  20. MP1

    Levitating Globe

    ...I suspect it is the opposite principle. They are most likely repelling... MP
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