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  1. MP1

    Transformer and LM317 Question

    Harry, It sounds like your question is mostly about how to calculate current and voltage ratings when using different rectification methods. I have attached some diagrams with formulas. Hope it is helpful. BTW- I also prefer to use jpg. Your picture looks fine when I click on it and it turns...
  2. MP1

    Adams Motor Project

  3. MP1

    Making Life Easier

    I might add to this, that if you are using a circuit board program that creates a silk screen image of the components automatically, you can print this and do the same. I think this is an excellent idea. A little clay or flux in the holes and you could spray a light laquer or conformal coat to...
  4. MP1

    6 or 7KW Inverter Needed

    Where did you see a sine-wave inverter article in the link? I only see square wave. Did I miss it or are you having fun with Renaldo? MP
  5. MP1

    Help: Determining What Resistor to Use

    awak3n, Here is a voltage divider calculator. This makes learning the formula more fun. http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv.html MP
  6. MP1

    Speaker wire question

    Perhaps this will hep you determine what you have. Hope it is helpful. MP
  7. MP1

    Best circuit drawing software out there?

    I totally agree, indulis. I have yet to find a package with everything I need. I always have to use different software packages for different types of design. Even the more expensive packages have many things lacking. MP
  8. MP1

    I CAN'T READ THEM

    There are some instrumentation circuits in our projects section such as power supplies, etc- that might be helpful. The nice thing about building these is that you have equipment for your workbench when you are done. A real plus for someone who is new to electronics. MP
  9. MP1

    IM NEW

    ;D hehehe...I didn't even see it. Mixos moved this one. I'll catch ya next time.  ;D Welcome to the forum Crusader! MP
  10. MP1

    simple microcontroller based aquarium pH meter

    Here is one. The author's email address is in the schematic. Hope it is helpful. MP
  11. MP1

    6 or 7KW Inverter Needed

    Renaldo, It is as ante has mentioned: An inverter such as your request is not normally built from a 12VDC supply. Batteries are connected in series and parallel groups to convert from a much higher voltage. Some actually convert 120 VDC to 120 or 240 VAC. It is easier to keep them charged and...
  12. MP1

    Free sample chips!

    Companies differ, but usually, in their questionaire,  they are looking for Engineers with an upcoming project. Many will send parts to students but I have heard that this is not such a common practice as it used to be. MP
  13. MP1

    About analog Multiplier

    Good one...I like that.... ;D MP
  14. MP1

    Need help in using Darlington Pair IC ULN2003A

    masterleous, Here is a link to a schematic using ULN2803A with relays. Perhaps it will help or give you some idea on your project. Hope it is helpful. MP
  15. MP1

    Led display Digital Voltmeter question

    Did you add the power supply bypass caps? I cannot think of a reason why it would work a year ago but now with no changes it does not work. Something must be different. Are you measuring a true DC waveform? Does the display agree with the voltage that is being measured? Please tell us more about...
  16. MP1

    help about this supply

    Hi Steve, To answer your question: You will see some differences in output, but mostly dependent upon whether you have a capacitor on the output or a resistive load. There is also a difference in the current output for the different types. See below: MP
  17. MP1

    help about this supply

    Put it to rest, ante. If Steve needs more information he will ask. I think you have kicked this dog enough. It is no longer moving. MP
  18. MP1

    help about this supply

    ante, Completely written while looking at Steve's link. I did not assume from the post that anyone knew what full wave or half wave rectification is, and thus a little explanation. I think the post is explained pretty well if you look at the terms for rectification type. Something anyone should...
  19. MP1

    Question about Ground Loops

    I do not see where sensors connected to a logger is any different than all of the different peripherals of a TV working together. If all components do not have the same ground potential, none of your voltage references are the same from one end of the device to the other. If the shielding is not...
  20. MP1

    help about this supply

    Ante, I was not implying that 2 diodes are better than 4. Only that 2 are better than 1 in regards to ripple. I also recommended that Steve use a bridge rectifier (4 diodes) if he were not going to use a center tapped transformer. Sorry if I was not clear on that. MP
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