Recent content by MP1

  1. MP1

    Inverter

    Bose: The buzz sound that you heard was caused from not using a large enough transformer. Freerider: There are much better inverter designs on the web, which will give you much better satisfaction. I would rate this project as a learning project for basic inverter design. Years ago, Delco...
  2. MP1

    plz help me in getting the pin configuration of IC ZN414

    Please do not post IC requests to the Projects Q/A forum. It is for discussion of projects found on our site. I have moved this topic to the correct forum. MP
  3. MP1

    Microphone Echo/delay IC datasheet.

    You won't get much resolution without specialized chips. Here is an article about a simple form of audio delay using 1 bit ADC. Perhaps this will help. http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=8056 MP
  4. MP1

    Car battery to parallel port

    An LM7805 will work fine in your automotive application. You could also use a LM78L05 which has a smaller package. You will certainly need the capacitors on input and output. For the input, it depends on how clean the DC12 is. I have never seen a car generate a real clean DC voltage, so I would...
  5. MP1

    Car battery to parallel port

    TJ, Correct on both questions. I recommend that you stay under 5 mA. I normally use 5V through a 4K7 ohm resistor as a parallel port pin high. For best results you do not want to float the pin in any state. You should insure it always has a 0V or 5V level by tying the port pin high or low...
  6. MP1

    Car battery to parallel port

    When you use your resistive divider to drop the voltage down to 5 volts, you just need to select values of resistors to limit the current. This is basic ohm's law. V/R. Was this your question or did I misunderstand? I am not sure how you intend to monitor status by using one 5 volt pin. As an...
  7. MP1

    Free sample chips!

    Jack, Everyone gives away the assembly code programming compilers. There are also many free C compilers, but they are very specific to the brand of chip you use. For example, you would need a different compiler for PIC than you would need for AVR if you write in C. Actually, you would use...
  8. MP1

    Making DAC with 0808

    Just use R2R ladder and an output buffer or op-amp. MP
  9. MP1

    Free sample chips!

    You don't need a programming board for Atmel AVR. Just make a programming cable and use one of the free C compilers found on the web. MP
  10. MP1

    synthesizer problems

    Topic moved. Posted in wrong forum. Projects Q/A is reserved for discussion of projects in this site's project section. MP
  11. MP1

    have you simple digital volume control

    Here is a digital volume control from our site: http://www.electronics-lab.com/projects/audio/010/index.html You can also see other projects from this site by pressing the blue link at the top of the page titled "Projects" MP
  12. MP1

    PIC12f629 + motor

    Please post a drawing of your setup. Are you trying to power the motors directly from the output port? If so, you need to compare the current rating of the motor with what the PIC can provide. Did you mean you have an LED in series with the motor, drawing away some of the very little power...
  13. MP1

    LED pulser help

    Your LEDs are pulling too much curent for this little transistor. Since we do not know the built in resistor value and the specs on these LEDs it will require a little research and calculation of your own. If you do not have this information, you can remove the LEDs one at a time on your bench...
  14. MP1

    very loud alarm help please

    For this distance I would recommend a power amp as audioguru has suggested and I recommend a horn instead of a speaker. MP
  15. MP1

    16 or 24 Cannel Gang Switch

    How many stations or momentary push buttons are needed? How much voltage and current being switched? MP
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