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  1. MP1

    handy tip for intefacing your PC with projects

    Yes, Pin 1 of the Parallel port is the strobe line. Pins 2 through 9 are outputs D0 through D7 respectively. Also, I looked at your bingo program with a text editor and it looked like there were some unremarked comments in it, like the first line was "clear". It might be possible that if you go...
  2. MP1

    Led display Digital Voltmeter question

    Kasamiko, if that will not work for you, here are the eagle board and schematic files. If you do not have the free eagle layout editor, you can get it from the dowmload links on this site. You can edit these files with this version of Eagle to make the design more specific of your application...
  3. MP1

    Bench Test Equipment

    Would like to see postings of used Bench Test Equipment. I think we all could use another meter from time to time. MP
  4. MP1

    When to use a heat sink

    If you are using a 6A rated bridge rectifier in place of D1 through D4, which are rated at 2A, then you are never going to need a heat sink for this rectifier bridge. It will never work that hard in this circuit. The Heat Sink in the picture is for the 2N3055. The data sheet for this transistor...
  5. MP1

    help about inverters

    No. That is not what I am saying. Let me explain this in a different way. If the transformer is capable of putting out 120VAC at 10A (remember, we are talking about a step up transformer) then with a voltage doubler added to it, he would have 220VAC at 5A, which might still be sufficient for his...
  6. MP1

    help about inverters

    It is true as Ante has pointed out that the current goes down as the voltage goes up. However, if you have a sufficient amount of current to begin with, dividing will be no problem. The end user must make this calculation in the design. I would never do this as a bench power supply where you...
  7. MP1

    led powered by a/c How To?

    John, the ones you have purchased are polarized. The black band on the side with the dashes indicates that this lead is the negative side. For the application you are using them on, I really do not see where this is going to be a problem. Perhaps someone would like to comment why these have to...
  8. MP1

    Power supply for AMP in CAR

    Just a quick look at the circuit above...looks like you could use 2N3055 in place of the MosFets if you use a resistor to ground as discussed earlier. I think you could also get around the SG3525 with a 556 timer IC. One would have to compare the data sheets to get the correct pin out and...
  9. MP1

    Amplifier circuits

    ok, I apologize. I should have said they are clear to me. Not everyone is as familiar with data sheets as others, so I can see where there might be some confusion even after looking up the data sheet. Still, the manufacturer will give you technical support. All you have to do is ask. MP
  10. MP1

    State Variable active filter

    Great! When do you think you will be posting the schematic for us? MP
  11. MP1

    led powered by a/c How To?

    Here you will find the answer to molding plastic: http://www.pulsar.gs/4_si/3-UniVac/_univac_frameset.html Would be interested in knowing how you do when all is complete. Please let us know. MP
  12. MP1

    transmitter/reveiver design for fiber link

    Indiglo, your circuit will simply change the electrical data to light and then back to electrical data again. The reason to do this is normally to send data through long signal lines without electrical interference. You should not have to worry about sync problems with an analog signal. The only...
  13. MP1

    led powered by a/c How To?

    Glad to hear it. I always have a concern when working on high powered circuits. In regards to the capacitors, and any of these parts for that matter, you can use higher rated parts. For example, a 220 Volt rated capacitor will work just as well at the lower voltage. This rating is a maximum...
  14. MP1

    State Variable active filter

    ...as he said, he needed gain up to 20dB and roll off at 40dB/decade. Op amps are the best way to go to achieve this. If you can provide a similar circuit as you have mentioned using only transistor capacitor transistor capacitor, please post it so that we can see. I think that it is only fair...
  15. MP1

    State Variable active filter

    Here is what is inside the common LM741 op amp. With this in mind, your post does not really make a lot of sense. Perhaps I misunderstand? MP
  16. MP1

    Amplifier circuits

    Many of the web postings you see are just the schematic from the application notes of a manufacturer's design. If you go directly to the data sheet, the reason for the added external components is usually pretty clear. MP
  17. MP1

    led powered by a/c How To?

    You can buy these parts at your local Radio Shack. Depends upon where you live. Online, my most common sources are: www.digikey.com www.mouser.com www.circuitspecialists.com www.allelectronics.com I would also like to insert a little warning here, though. If you are not familiar enough with...
  18. MP1

    State Variable active filter

    It would take far too many transistors for a similar circuit to make such a design feasible, stable, and allow this kind of control to bandwidth, center frequency and damping factor. MP
  19. MP1

    need protel2004

    http://www.protel.com/product.htm MP
  20. MP1

    HELP WITH CLOCK( anyone please)

    It has been quite some time since I have used modulo X circuits. If you could post your schematic, perhapsw we could all have a look and see if we can help. In the meantime, I have found this link that might be helpful: http://www.ccse.kfupm.edu.sa/~masud/text/lab7.pdf I also recall seeing...
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