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  1. MP1

    relay

    Arsal, You don't want to supply a voltage from the micro port to control a relay. Instead, use the micro to sink (drop) the line to 0 V. I use the Opto 22 Solid State Relays directly off the port pin of a micro for industrial control of mains with no problems. You don't need a transistor or any...
  2. MP1

    POWER INVERTER

    You are right on this point AG. The design with the two transistors circuit crossing each other is referred to, by many, as a "Flip Flop", but this is certainly an astable, not bistable and thus does not latch. Flip Flop was probably a poor choice of words. I think that the "multivibrator...
  3. MP1

    ATTENTION: Illegal content (ebook/magazines/software) will be deleted

    Hey guys, This site is liable for copyright infringement. All those complaining are not the ones who will be in the worst of the legal trouble. Any one want to put together donations for a legal fund in case the site is sued? Yeah, I didn't think so! I think all mixos is asking, is that you do...
  4. MP1

    POWER INVERTER

    Onix, The Inverter project is based on the multivibrator concept. This is also known as a Flip-Flop. In this case, a 2- transistor flip-flop. You can find many descriptions and discussions of flip-flops on the Internet. The output is a square wave. This design is not as stable as many more...
  5. MP1

    "Power?" Inverter

    Since this old thread was started, I have gotten feedback that others have built this Inverter. No one has reported to me that anything has burned or exploded. No injuries and no damaged devices connected to it. This could mean that Aaron's site has more newbies or people who should not be...
  6. MP1

    How I can convert (USB) to 12v?

    depends on the current needed and if the DC-DC converter can provide it. MP
  7. MP1

    USB voltage question

    Casdale, Get a 5V fan that is rated within the current specs of the USB port. MP
  8. MP1

    Once a Student, Now a Teacher (of sorts)

    Hi Jeff, Welcome to the forum! My personal suggestion would be to buy him a soldering iron and a bread board kit. At this age, he will probably outgrow the snapkits very fast. For microcontrollers, you could start with the AVR line and a free Basic compiler named "Bascom AVR" from...
  9. MP1

    Input to the Parallel port

    Bat, It also depends upon which operating system you are using. Newer operating systems like XP are not as easy to do this for security reasons. I think someone posted a copy of Parallel Port Complete in the Resources forum of this site. Download it. It should cure your problem since it has...
  10. MP1

    Dimming LCD monitors

    You should post the model numbers in the data sheet request forum and/or the manual request forum. You might get a hit there. MP
  11. MP1

    Where can I buy FeCl3?

    Yes, Radio Shack probably doesn't know there is more than one type of etchant in the world. What they carry is the ferric chloride. Also, if you plan to use lots, Circuit Specialists carries the powder form. Much cheaper to ship, but you have to be careful when mixing it with water or you can...
  12. MP1

    Where can I buy FeCl3?

    Bob, Radio Shack carries Ferric Chloride. Also, you can order it through www.circuitspecialists.com MP
  13. MP1

    3-Axis Stepper Controller

    The questions I posted are key questions to try and determine where the fault might be. Without answers to them, I really do not have a clue as to what is wrong. The pc power supply has quite a bit more amperage than what you need, but the power supply does not cause this problem. Something is...
  14. MP1

    Led display Digital Voltmeter question

    Skipper, Mixos is using this voltmeter for his 0-30V power supply. He states earlier in this thread that he uses 12K for R3 to get one decimal point precision on a 0 to 30 volt scale. His comments are here: http://www.electronics-lab.com/forum/index.php?topic=5629.msg636#msg636 There were a...
  15. MP1

    3-Axis Stepper Controller

    Nickolaw, What are the symptoms of the fault? When you say it is not working, what is it doing? Have you checked the power supply? Has something burned on the board? If not, have you checked all settings in the software? Have you slowed down the steps to make sure the motor is not stalled? Have...
  16. MP1

    Led display Digital Voltmeter question

    What did you use for R3? Also which pin 5 did you jumper on the display? MP
  17. MP1

    Led display Digital Voltmeter question

    I use 1% tolerance resistors for everything. R3 in this project must have such accuracy, but the others could be 5% if you have trouble getting 1% tolerance in your area. Ceramic caps are cheap, but they are not real good, either. If you use a higher grade material such as poly, mylar and...
  18. MP1

    Led display Digital Voltmeter question

    You will have to experiment a little on the capacitor size for the alternator noise. This is the same problem you might encounter with anything you build and add to your car. You might even need to use a choke and build an alternator noise filter if you have a lot of noise in your system. It...
  19. MP1

    3-Axis Stepper Controller

    The chip does not have a high watt rating. If you are using steppers that consume large amounts of energy, you could damage the chip. What is the rating of your steppers? What is the rating of the power supply you used? MP
  20. MP1

    High Power LED Mood Lamp

    Nef, If you did not set the fuse bits correctly, the micro is not going to work correctly. You need to re-program the PIC before you can do much else. MP
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