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  1. MP1

    0-30 Vdc Stabilized Power Supply

    I have seen a good answer to this from ante in the past. He coils a wire and attaches it to the top of the transformer for an additional low voltage tap. Perhaps he can give you a little more instruction regarding this since I am only giving the information second hand. MP
  2. MP1

    Want to power up my programmer

    How about the rest of the circuit? There is no transistor in the diagram you have posted. How can anyone tell you what you need when they do not see all of the circuit? What is the current consumption of your circuit? MP
  3. MP1

    Electromagnetic field interference.

    No black magic there. You must have some reference that you are calling zero. Since all of these commons can be at a different potential, there is no "common" reference. Thus, your shield is just another voltage reference and is not protecting anything. If you want the shield to be at the same...
  4. MP1

    Soldering: what am I doing wrong?

    Wow, expensive tip. Yes, I use liquid flux on all my soldering. The core flux helps the solder to flow on the copper, but it is rarely enough. A trick I learned years ago. When I was going through MIL SPEC soldering coursework, flux always got me higher grades since the joints were always better...
  5. MP1

    Want to power up my programmer

    Shaiqbashir, Where do you need 13 volts in your circuit? You only need the final conversion to 5 VDC for the micro. Unless there is more to the circuit that you have left out, you could simplify this and just use a 5VDC conversion. Regulate a 9 volt battery down to 5. In this case, forget the...
  6. MP1

    Kasamiko just turned 33

    Happy Birthday, Rhonn!! MP
  7. MP1

    Soldering: what am I doing wrong?

    At this point, you really need a new tip. Sanding down the tip just causes more harm. Are you using a wet sponge to clean the tip whenever you get burned residue on it? This helps. One nice tinning trick is to get a nice blob of solder on the tip when you are done with it and then let it cool...
  8. MP1

    Electromagnetic field interference.

    I would have all commons connect together at one single point as I indicated above. All shielding must be at some potential. You want it to be connected to common of all devices. MP
  9. MP1

    Correct wiring for a remote pot

    Should work fine. MP
  10. MP1

    Simple question about measuring output of a wall mount transformer...

    This is true. Even though we have attributed the Watts calculation with ohm's law and most of the ohm's law calculators include it, power calculation was not part of the original ohm's law. It is an extended calculation.  ;D MP
  11. MP1

    Correct wiring for a remote pot

    If it is only a 0 to 5VDC signal, you can use a shielded cable to shield against rf. Connect the shield at one end only to keep from producing ground loops. If you are experiencing signal loss due to length, you can increase the current to the pot to compensate. If the length is too long for...
  12. MP1

    Auto/deep cell charger

    http://www.surplussales.com/Inductors/Ind-SlugTu/Ind-SlugTu-6.html http://www.surplussales.com/Inductors/Ind-SlugTu/Ind-SlugTu-4.html Hope it is helpful. MP
  13. MP1

    Electromagnetic field interference.

    Even when you separate the digital and analog grounds, all common connections are put together at one common point. In this case, you basically have two electrical circuits interfering with each other. This is why I suggested that you post the circuit. I certainly understand if you do not want...
  14. MP1

    DRC and net list

    Are you kidding? I ALWAYS use auto-router. Analog, Digital, and Mixed-Design. You must not put together very complicated circuits if you manual route all of your Analog boards. ERC and DRC eliminate any problems that you might encounter. Netlist tells you if anything is missing. If there ever IS...
  15. MP1

    Auto/deep cell charger

    ...
  16. MP1

    Simple question about measuring output of a wall mount transformer...

    The wall wart will give you all the informatin you need. If it states 9V@500mA, you just need to use a resistance that will cause a 500 mA load from 9 volts. Make sure your Watt rating on the resistor is high enough. You can calculate this on your own. It is easy with ohm's law, and then you...
  17. MP1

    Analog To Digital Converter

    Original post... Peron: Perhaps you could give a hint as to what IS available in your market. As ante has mentioned, 7106 is the best alternative to do what you are trying to achieve. Samples from the manufacturer are available for this IC in most places of the world. MP
  18. MP1

    Electromagnetic field interference.

    You could try separating your digital and analog grounds and if needed, build shields around the motors. Perhaps you should post information about the electronics. It is possible that the electronic noise is transmitted through your circuit. If this is the case, all the shielding in the world...
  19. MP1

    circuit design

    Queen, Frequency that the motor can handle is pretty much different from motor manufacturer to motor manufacturer. You will have to make some adjustments when you make this circuit. You should make the frequency adjustable anyway, so that you can use different speeds. I would recommend that you...
  20. MP1

    how to build my own buzzer? (or other noise maker)

    You already have the solar cell to buzzer working. Just add a comparator circuit between the solar cell and buzzer so you can adjust the threshold. In fact, you could even use a separate photo cell or LDR to trigger the circuit from light. MP
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