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  1. Kain

    stroboscope

    Hi EdwardM! True about the rates, but don't you think those contacts will not last with all this high discharge current and arcing? Considering they will be opening and closing from 5 to 20 times/s with all this arcing....oh well, just my thoughts  :)
  2. Kain

    IS this correct? Relay?

    Yes this is correct. I have a question though - is this button with normally open or closed contacts? On the picture it looks more like normally closed...
  3. Kain

    stroboscope

    You are right - you cannot use AC to power those up. However, one simple thing that you can do is voltage doubler or multiplier (depending on where you live). If your outlet AC is 220RMS then a doubler would do and of course you will need to limit the charge up current otherwise you might get...
  4. Kain

    stroboscope

    Hi. What sort of lamps are u planning to use? If you want to achieve a proper strobe effect u need to use discharge lamps like the ones used in photoflashes. Those have 3 electrodes - Anode Cathode and controlling electrode. The way it works is by applying high DC voltage between the Anode and...
  5. Kain

    Phase measurements and time base.

    Hi again. I have been playing arround with the scope lately and it is not too hard to figure out that in order to make a correct phase difference measurement when we feed 2 signals we should always have the same time base, and this is where I wonder
  6. Kain

    CMOS 555 BURNS???

    Ok now,  I decided to try this once again before I totally change my mind about the circuit design and so far is seems like Aidioguru hit the jackpot  ;D. I tryed the exact same circuit with a bypassing capacitor of 100nF across 1 and 8 as close as I can hook it and another capacitor of 100uF...
  7. Kain

    CMOS 555 BURNS???

    Alun:  "What are you trying to do?" I am trying to use 555 as a delay-on timer. In this particular circuit when there is nothing applied to the base of the transistor it shorts out the capacitor which causes pins 2 and 6 to have positive with respect to ground - the output on 3 is low. Once we...
  8. Kain

    CMOS 555 BURNS???

    Here is a circuit that I tryed yesterday. I first tryed with NE555 which is the regular 555 timer but then I wanted to have less power consumed so I decided to try with TLC555 which is same timer but CMOS (LINMOS) version from Texas Instruments. While the NE555 seems to work ok, the TLC555...
  9. Kain

    ACHIEVE LOW ESR CAPACITORS...

    Oh, so they mean capacitors reactance by saying impedance... Ok, makes sence.  ::)
  10. Kain

    ACHIEVE LOW ESR CAPACITORS...

    Ok, how about this? If the impedance of a capacitor is the sum of the real and imaginary part then if we know that the impedance of a capacitor that is given in catalog is 0.01Ohm then this means that the sum of the ERS and the imaginary are 0.01Ohm at most, meaning that ESR has to be even less...
  11. Kain

    ACHIEVE LOW ESR CAPACITORS...

    Ok I understand this :) Should I take this responce as "ESR cannot be decreased by connecting capacitors in parallel?" And also, is ESR portion of the real resistance or capacitor? By our discussion so far it seems like the only way to get low ESR is to go find a speciffic one. I wonder who...
  12. Kain

    ACHIEVE LOW ESR CAPACITORS...

    Hello again, I was reading lately about swithing PSUs and noticed that they require a low or ultra low ESR capacitors in general. I have checked on different manufactors but I read that a ultra low ESR can be achieved by connecting smaller capacitors in parallel. I looked in google for some more...
  13. Kain

    Convert 0-30V 3A PSU to 5A or more

    I just did something simple - I connected the PSU across a huge rheostat set to 6 Ohm and set the PSU to max V and A. First thing to notice - I figured I can cook on the rheostat...
  14. Kain

    Convert 0-30V 3A PSU to 5A or more

    Ok, finally some late update on this project from me. As you already know I assembled the PSU and had some problems with the maximum output voltage. I finally found the problem - there was an unetched copper on the board between 2 traces that looked so good that one can never tell it's not...
  15. Kain

    ORCAD SYMBOL IN LIBRARIES...

    Well I know I can do it, but I don't know how to do it yet - remember I just mentioned that I am trying to get into ORCAD, meaning that I am a newbie in ORCAD  ::) This is why I am trying to find the symbol for now - it's simpler this way I believe.
  16. Kain

    ORCAD SYMBOL IN LIBRARIES...

    I was just trying to get little by little into ORCAD by trying simple simulations and I run onto this circuit on the picture. It's more than simple, but the problem is that I have no clue where I can find this double arrow symbol for node out? Does anybody here knows which lib contains this...
  17. Kain

    New to electronics, designing water temp sensors circuit for PC use, need ideas

    The simple way this is usually done is by using AD convertor so you are able to send analog data to the LPT or any port that you might be using. So you should be using AD convertor and interface it to the LPT (LPT is easier  ;D).
  18. Kain

    Dual CMOS based timer problems...

    I haven't bypassed it but I doubt that this is going to solve the problem. In fact I wonder if the timers are faulty at all. Any of those boards is perfectly working out of the machine that they are made for. Once put in the machine the first timer (the one that is on the lower part of the...
  19. Kain

    Dual CMOS based timer problems...

    Bad news - this solution did not help at all. The timer just goes on on itself and I know that it is not false trigering of the gate because it's not pulled down with resistance. The way i know is because I see the indicating LEDs going on like crazy without any input. I am totally lost now ...
  20. Kain

    Dual CMOS based timer problems...

    Hi Ante! Yes I was thinking about that too since these are too sensitive, so I am guessing they might trigger from noise sources arround if there are any. I'll do this too and let you know if there is improvement  ;D
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