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  1. MP1

    The link intercom

    You should post a link to the project when you ask a question. Otherwise it is difficult for others to see what you need help with. MP
  2. MP1

    MOVED: LED turn

    This topic has been moved to Electronic Projects Design/Ideas. Posted in wrong forum. Note that I will start deleting posts that are posted in this forum that do not belong here. http://www.electronics-lab.com/forum/index.php?topic=10974.0
  3. MP1

    MOVED: insect attach

    This topic has been moved to Electronic Projects Design/Ideas. Projects Q/A if for discussion of projects that are located on this site. Please help keep the forum organized and post in the correct location. http://www.electronics-lab.com/forum/index.php?topic=10978.0
  4. MP1

    MOVED: battery selector

    This topic has been moved to Electronic Projects Design/Ideas. Posted in the wrong forum http://www.electronics-lab.com/forum/index.php?topic=10979.0
  5. MP1

    MOVED: Common Collector Emitter Follower

    This topic has been moved to Theory articles. Posted in the wrong place. http://www.electronics-lab.com/forum/index.php?topic=10975.0
  6. MP1

    12 V DC to a 220V AC Inverter AMplfier Design

    Kachew, Are you looking for the formula for the CD4047? It is 1/(4.4 * R * C). R is in ohms and C is in Farads. There is a lot of tolerance latitude since this is only a square wave inverter. Square wave inverters are not used in circuits that require frequency and voltage precision since the...
  7. MP1

    12 V DC to a 220V AC Inverter AMplfier Design

    Once again, the only value of your posts are personal conflict. It is posts like these that make me understand why no one would mentor you so that you could become an Electronic Engineer. As I stated earlier, the values posted in the project by the original author, Ashad Mustufa, have been...
  8. MP1

    12 V DC to a 220V AC Inverter AMplfier Design

    The posted values on the project have been bench tested. When someone posts something like the above quote, they should perform some bench testing instead of making such statements from theory and application notes. For the low frequency clock of 50 hz, these values work fine. As the TI...
  9. MP1

    0-30 Vdc Stabilized Power Supply

    Subodhthok, You are correct. The schematic does not show the pin numbers and the text in the project is not clear in using the terms "Offset Null" to describe this connection. To understand more about what RV1 is doing, you can perform an Internet  search for "op-amp and Offset Null". You will...
  10. MP1

    PC Control Board

    I don't know why you wouldn't have the minimum 3 to 5 volts on the data lines of your parallel port unless you either measured incorrectly or you have a problem with your port. Check to see if it operates your printer. The ULN chip is not needed for parallel connection to an SSR. It needs no...
  11. MP1

    PC Control Board

    Hello phinder and Kevin, I am not sure what type of power you need for these solenoids, but here is an example of controlling the mains voltage from a PC. I can't imagine you would need any more power than this for the solenoid. You can use the parallel port of the PC to set a pin high, which...
  12. MP1

    pressure sensors?

    Are you looking for something like this? http://www.tekscan.com/flexiforce/specs_flexiforce.html MP
  13. MP1

    Help!! My Door Alarm is not work?

    Michael, More specifically, L1 is made by wrapping (coiling) the wire around R2 until it is completely covered with the winding. This is why it says 20 to 30 turns. Different resistors will be different lengths and thickness. MP
  14. MP1

    DIgital Voltmeter

    You should use the correct chip. Most manufacturers will give you free samples. MP
  15. MP1

    What's wrong with electronic car ignition project?

    EDY is a member of this forum. Since he did not elaborate in the project page, why not send him a personal message asking why. There is also another thread in this forum where this was discussed some time ago. You should be able to find it with a search. MP
  16. MP1

    My 12 watt x2 stereo amplifier

    Hey Ben, The project looks nice. If it also sounds good, why tweak it? Congratulations on your achievement! MP
  17. MP1

    communication with crystals

    Proview, Have you looked at the radio circuit projects on this site? Click on the "Projects" link at the top of the page or follow this link: http://www.electronics-lab.com/projects/rf/index.html. MP
  18. MP1

    Lowpass filter for subwoofer

    Use what you want, but your picture doesn't even agree with your statement. Sure looks like the more squared silver mica than the very small round ceramic to me. ;D All fun aside, the silver mica will be better. I use them in microcontroller crystal applications where more precision of...
  19. MP1

    Lowpass filter for subwoofer

    They are certainly not ceramics. With a closer look by enlarging the picture, I see these three are not all the same capacitor type. The 39 pf has a different appearance. The 100 nf caps are tantalum and the 39 pf cap is a silver mica. In looking at the schematic this also makes sense due to...
  20. MP1

    Lowpass filter for subwoofer

    The 3 capacitors on the right hand side of your picture are tantalum. Not ceramics. Collinph: I have moved all of your other posts into this thread. It only confuses everyone when you post your questions many different times in different places. Also, there is a link from the project to read...
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