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  1. crutschow

    Circuit Simulation of LTC3703

    Not surprising the circuit doesn't work. The LEDs go from the input and output voltages to ground, not in series. And why did you put one in the Vcc bias line? You are trying to disobey Ohm's law. How do you expect amps of load current to go through the 1kΩ resistor and LED? Only the upper...
  2. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    The problem with written communication is that you don't hear the voice inflections or see the expression of the other person conveying the message, so its intent is sometimes misinterpreted.
  3. crutschow

    Circuit Simulation of LTC3703

    Note that for a 100V input, you will need a higher voltage rated MOSFET (at least 120V). Also Q1 will need to be mounted on a heat-sink.
  4. crutschow

    Circuit Simulation of LTC3703

    Because the Vcc and DRVcc bias voltages are limited to 15V max., so with a 24V-100V input, some means is needed to reduce the voltage for those inputs. This requires either a separate supply or the Zener-Transistor kickstart circuit shown, to provide Vcc until the output can supply the Vcc voltage.
  5. crutschow

    Circuit Simulation of LTC3703

    Here's the simulation with 24V input, 10A load, and Vcc generated from the output 12V. The simplified circuits you posted are just to indicate the basic circuit configuration, not to build an operating circuit. The series resistor values for an LED are: (Vs-Vd) / Id, where Vs is the supply...
  6. crutschow

    Circuit Simulation of LTC3703

    What is Vin?
  7. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Yes, I misunderstood your comments about simulators. I'm used to having the models (and my results) be fairly accurate, so I was lulled into a false sense of security and wasn't sufficiently critical of my results with that old 555 model. I appreciate you noticing the error. As far as time...
  8. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    I never used any of those straw-man words, so why did you put them in quotes? Who are you quoting besides yourself? I was using an old 555 model that doesn't model the nominal trigger points accurately. Below is the simulation with a better model which uses the nominal trigger points, and does...
  9. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Here's the simulation. The duty-cycle is not close to 50%. I trust the simulation, so I think Figure 14 is in error. Having fun yet? Better yet, for even more fun you should learn to do you own simulations with LTspice, so I don't need to be the middle-man.:rolleyes:
  10. crutschow

    Building a manually-controlled touch screen tapper for controlling farm tractor GPS

    The LM317 uses feedback from the output to maintain a constant output voltage, independent of the input voltage and output current. It adjusts the output voltage to maintain 1.25V across R2 (between the OUT and REF terminals). For the circuit below, this generates a current of 1.25V /121Ω =...
  11. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Whose fun? That would make the discharge level close to the THRS trip point and make the high period very long. It's not something one would do in a real circuit, so see no reason to simulate that.
  12. crutschow

    Building a manually-controlled touch screen tapper for controlling farm tractor GPS

    A buck regulator is a switching type regulator to get high conversion efficiency (>80%). A 12V to 2V converter would only be about 15% efficient (the rest generating heat). On what basis do you think it needs near 3A? Did you measure the current? Since I assume this current is only for a short...
  13. crutschow

    Circuit Simulation of LTC3703

    You right-click on the model icon and it will show you the path to the test fixture example (below):
  14. crutschow

    How to calculate my battery bank Ah ,kw and Kwh

    In your calculation you had Ah as one of the factors, so that calculates to be Wh.
  15. crutschow

    How to calculate my battery bank Ah ,kw and Kwh

    I believe that's Wh.
  16. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Below is the simulation with R2 removed: The low time is 88.91455ms, and the high time is 332.79446ms from the plot. Both seem close to the expected for the component values used.
  17. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Do you mean R2 or R3?
  18. crutschow

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    My simulation is realistic in that it shows what the circuit does with the 13.7kΩ resistor I used. That value gave a low time of 668.96552ms and a high time of 665.51724ms. Using 11.2kΩ gave a low time of 576.8459ms and a high time of 667.98169ms. So for whatever reason, the value I used...
  19. crutschow

    confused about full bridge rectifier

    As BJ noted, resistance is resistance. You should be able to measure the coil resistance with either of your shitty multimeters.
  20. crutschow

    confused about full bridge rectifier

    Your confusion is that the diodes may not be blowing from overvoltage but from overcurrent.
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