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  1. crutschow

    need guidance making a voltage regulator

    Yes, I figured that was the likely reason. Just pulling your chain a little. :)
  2. crutschow

    need guidance making a voltage regulator

    Could you elaborate on that? ;)
  3. crutschow

    Asus M515U laptop charger snapped into 2

    If you want a good, permanent solder connection, here's how to do that.
  4. crutschow

    Voltage limiter 9V and above

    Glad that's settled.
  5. crutschow

    need guidance making a voltage regulator

    Perhaps a unit like this would work.
  6. crutschow

    Voltage limiter 9V and above

    That's the voltage you get with no load, due to the current through R4 from the Ref voltage, although it should be less than 2.5V.
  7. crutschow

    Voltage limiter 9V and above

    Do you have a load on the MOSFET output? It could act erratically without some load.
  8. crutschow

    Voltage limiter 9V and above

    Yes, the current through that resistor due to that voltage drop is what generates the hysteresis voltage change at the Ref input to the TL431.
  9. crutschow

    Voltage limiter 9V and above

    As I noted, that provides a small amount of positive feedback for hysteresis of the trip point, not negative feedback. Only negative feedback would give a possible concern about stability. Since the circuit is acting as a comparator with only two stable states, your continuing concern about...
  10. crutschow

    Voltage limiter 9V and above

    9.4.1 Clearly states that as comparator, it is operating open-loop and thus cannot have phase-margin problems, since it has no negative feedback. Why do you keep implying otherwise?
  11. crutschow

    Voltage limiter 9V and above

    That's when using the device as part of a linear regulator. Here it's being used as a comparator.
  12. crutschow

    Voltage limiter 9V and above

    Then it would appear you have a bad (cold) solder joint or incorrect wiring on the soldered circuit. This is a nit, but you don't have a voltage limiter circuit, that's a low-volage cutoff circuit with the TL431 acting as a comparator with a built-in reference voltage. The schematic looks...
  13. crutschow

    LC oscillator and resonance frequency

    Here's the sim when applying a 1Vpk sinewave to the tank for 1 1/4 cycles at its resonant frequency.
  14. crutschow

    LC oscillator and resonance frequency

    The operation of an LC tank circuit is not complicated conceptually if you look at it from an energy point-of-view (which does require a little simple math). Once there is energy stored in an ideal tank, the energy is simply transferred back and forth between the capacitor (all the energy when...
  15. crutschow

    Hp power use

    That could be reactive (inductive) current that generates the magnetic field.
  16. crutschow

    Hp power use

    The inertia of a steady load has no effect on the power, only the energy required to get it to speed.
  17. crutschow

    Hp power use

    Did you install a new pump with motor or just a new motor? The power drawn by a motor is basically determined by its load and wouldn't change much with the motor rating for the same load. You electric bill will be mostly determined by the amount of water you use, not the size of the pump. All...
  18. crutschow

    USB power cable with 35 second delay

    One like this, might be adapted to work for you (to get more than 24s, you would need to increase the timing capacitor value).
  19. crutschow

    Design an analog computer circuit

    Since this is homework, you will need to show us your best attempt at doing the work before we can help. It sounds like you have no idea on what to do. Was this not discussed in the course your are taking?
  20. crutschow

    WallWart conversion...

    Only if it's being powered by the correct voltage. Otherwise all bets are off.
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