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  1. Ch33f

    Trying to understand a low voltage warning circuit

    Ok, so when I see a zener of sorts in parallel with something else I will assume it consumes most of the current. Just one followup question: For what Voltage should I configure the circuit when I want to use it for a 9 V NiMh battery with 250 mAh?
  2. Ch33f

    Trying to understand a low voltage warning circuit

    Ok well, now I know how to calculate the dynamic resistance of LEDs and I am sure that will come in handy at some point but it doesn't seem to help me understand why the current mostly flows through the zener. If I understand it correctly the dynamic resistance is a function of current. As in...
  3. Ch33f

    Trying to understand a low voltage warning circuit

    Ok but which way do the dependencies go? I was looking at some datasheets for LEDs to get an idea and it seems like the voltage drop depends on the current running through it. That would mean the resistance is dependent on the current. But how does that work? I always thought the current...
  4. Ch33f

    Trying to understand a low voltage warning circuit

    Btw. thanks a lot so far! You already helped me get a better understanding of electric current! :D
  5. Ch33f

    Trying to understand a low voltage warning circuit

    Ooookay... why? Or how do I know that / figure that out without measuring it? I read something along the lines of I1/I2 = R2/R1 in parallel circuits but since those are diodes and (to my knowledge) that equation only applies to ohmic components. So how can I figure out how much current flows where?
  6. Ch33f

    Trying to understand a low voltage warning circuit

    Ok, so when the active zener is off the current can only go through the LEDs and they are provided with approximately 2 mA which is enough to light them up. So ... I got that now but now I'm confused by why they are off when the active zener is on... So... you said when the supply voltage is...
  7. Ch33f

    Trying to understand a low voltage warning circuit

    Hi there everyone, Introduction: I'm kind of a newby in electronics but I am eager to learn and want to actually understand how things work instead of just (re-)using them. This is why I'm posting here. I hope this is the right form to post it on. In order to accomplish this goal I read...
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