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  1. morpheous87

    About "Voltmeter + Ammeter LCD panel" project

    Hi, I want to make this VA meter project for my 0-30V power supply unit(also project from here). I have a few questions about the VA meter.  http://electronics-lab.com/projects/test/007/index.html is the project. - The power suplly, can exceed the 30V limit, and to be aroun 31-32V for example...
  2. morpheous87

    0-30V Stabilized Power Supply

    I want to ask, if the power supply gives 3A at 30V, can it give ~7A at 12V when charging 12V batteries ?
  3. morpheous87

    0-30V Stabilized Power Supply

    How much A should it be?
  4. morpheous87

    0-30V Stabilized Power Supply

    I did some work on the case for the PSU, but after I finish one of the PCBs doesn't work anymore. Perhaps a piece of wire could sortened something. But I clear the PCB several times, but the fuse continue to break. Somethimes the fuse is OK and I measured some values, but I'm not sure where...
  5. morpheous87

    0-30V Stabilized Power Supply

    That's the problem, I thnk to use it in series and parallel also.
  6. morpheous87

    0-30V Stabilized Power Supply

    I have two working PCBs for the PSU. Now I'm trying to make LCDs which will display the voltage and the current. I'm going to use Arduino for measurment and voltage deviders. My question is, could I use only one Arduino board to measure voltage and current from both PCBs (because of the common...
  7. morpheous87

    0-30V Stabilized Power Supply

    The main filter capacitor is formed by 2 4700uF. Yestarday without the zeners on the OAMPs, the ouput voltage went over 31V.  Now when both PCBs are powered the input voltage from the transformer is 33,5V.
  8. morpheous87

    0-30V Stabilized Power Supply

    On the first of the PCBs I put 2 4,7V zeners, on the second i put 4,7V on U2 and 5,1V on U1 (i hadn't one more 4,7V). When only one of them is turned on (the one with the 2 4,7V) has 30,4V ouput. When I turn and the second one on, maximum output is 29,7V. The PCB with the 5,1V zener has ~ 27V...
  9. morpheous87

    0-30V Stabilized Power Supply

    Could be used 5,1V or 5,6V zeners instead of 4,7V ?
  10. morpheous87

    0-30V Stabilized Power Supply

    How much Watts should be the 4V7 zener?
  11. morpheous87

    0-30V Stabilized Power Supply

    PicMaster's version has 3 OAMPs, so I need 3 zener diodes on their positive pins?
  12. morpheous87

    0-30V Stabilized Power Supply

    I've made 2 PicMaster's version PCBs. They are working well. Since now I had a transformer only for one PCB, so I ordered a new transformer, which can supply both power supplies. The ordered transformer should be with 2 secondaries without common on 31 without load (so approximately 29-30V with...
  13. morpheous87

    0-30V Stabilized Power Supply

    I have a question about Arduino and PSU connections. In way I use pin2 on TB4 for common ground, how could I measure the voltage drop across TB4 ( it's on the groung signal path). I measured the voltage drop with common + and the two sides on the TB4, but I measured it with a multimer, with...
  14. morpheous87

    0-30V Stabilized Power Supply

    redwire This is the pdf I used to build my PSU. I'm not sure that the R7 you're talking about is the R7 in the pdf. Could you check is there some differences. Note that part's names on the last pdf's page (mounting diagram) is different from the part list page. Thanks for the help...
  15. morpheous87

    0-30V Stabilized Power Supply

    I want to made a V-A multimer for the 30V PSU based on Aduino platform. So I have some questions about it. I need a voltage devider so  the maximum voltage be <5 and put it in analog Arduino's pin. But how this devider should look? And for the current measurment I need a resistor to measure...
  16. morpheous87

    0-30V Stabilized Power Supply

    The biggest knob I found is 30mm in diameter. I'm wondering what would be better, this big knob or two potenciometers in series.
  17. morpheous87

    0-30V Stabilized Power Supply

    For the 3A PSU version (PicMater's veersion), can two potenciometers be usedin series for coarse and fine adjustment? I saw somewhere they should be in 1:10 propotions, so 1k and 10k ?
  18. morpheous87

    0-30V Stabilized Power Supply

    Could be used a 31V transformer for the PSU, ot it needs some changes?
  19. morpheous87

    help with home alarm system :o

    Do you mean PIR based sensors with these infrared sensors? If not use PIR sensors with analogue ot digital processing. Also there are microwave based sensors, sensors with more than one type (microwave-PIR for example). Fire sensors are different types also. The most popular are thermal or smoke...
  20. morpheous87

    0-30V Stabilized Power Supply

    Thre is something I want to ask. If I connected for example DC motor which needs 1A, and the A regulator is below 1A, current limit led is lit. When the current is near the nessesary value, the Led start slightly turning off. Then the current reach these 1A, the led is off. Is it normal?
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