Search results

  1. L

    0-10V DC Signal

    Have you checked your wire for continuity? Short together one end and measure the loop resistance from the other end.
  2. L

    Guns and Lasers

    One avenue that would be worthy of investigation might be using an array of foil strain gauges to measure the dynamic deformation of a steel plate impacted by a lead pellet. For instance, a 3"x3"x1/8" square plate suspended from the corners as a target with four strain gauges on the backside...
  3. L

    Can anyone simplifie this logic any more?

    The first thing needed is a segment truth table in order to generate the Karnaugh maps for each segment. Now if I did the attachment correctly it shows that some segments are driven by the same logic conditions so the segments can be tied together and driven by the same gates. Also when...
  4. L

    Can anyone simplifie this logic any more?

    For the 010=- does the '-' signify segment 'g'? Same for 101? Is this supposed to be a segment display with tails or not? What minimization technique did you use to place diodes in the logic lines?
  5. L

    Senior Project

    What is the chance of training the dog to change the battery in its collar transmitter? As an alternative approach have you seen the battery-powered toothbrushes that recharge without electrical contact when placed in their holder? Imagine a low-level AC magnetic field emanating from the dog's...
  6. L

    Audio signal to control voltage across electromagnet

    What does your ferrofluid display look like? How are the electromagnets arranged around the blob of ferrofluid? Do you expect to turn the electromagnets ON/OFF as with a switch, or driven by ramped currents from a linear amplifier? If the electromagnets were to be pulsed, what is the minimum...
  7. L

    Wideband Amplifier help

    Vcc should only affect the DC bias point, and if Vcc is held constant it should not affect the small signal analysis. Setting Vcc=0 simplifies the math considerably. I have attached an updated analysis where the result is an expanded polynomial instead of a factored polynomial.
  8. L

    Wideband Amplifier help

    I calculated a gain of 16.4 dB in the passband (same as your 6.6x). But the 3 dB low pass cutoff frequency is 379 Hz. Calculations attached.
  9. L

    7 Segment BCD Logic

    No, it does not want to be able to input your birthday. Better read it again.
  10. L

    Solenoid Back EMF

    Instead of guessing what the value of the distributed capacitance might be, could you estimate the value from the resonance frequency of the coil? Look at the ringing on the scope and measure the time between zero crossings; from that calculate the resonance frequency. Since you already know...
  11. L

    Karnaugh Map Problem

    I can't understand why you would need so many gates. The most I would use is 19 NAND gates. Are you not using a negative logic implementation? Here is what I would do: Take the 6 term Sum of Products (SOP) expression from above and lay it out in a pure logic diagram using only OR, AND, &...
  12. L

    Karnaugh Map Problem

    It is possible to minimize by 4 squares at a time instead of two, in this case by collecting the zeroes instead of the ones. But then the final result must be complemented. This also leads to a design implementation suitable for NOR gates since the inputs will not need to be negated.
  13. L

    Karnaugh Map Problem

    You should do the Karnaugh minimization visually; it's the only way to be sure.
  14. L

    coupled LC resonance circuit

    Are you asking how to construct a Bode plot for this circuit. See attachment.
  15. L

    Solenoid Back EMF

    What is the circuit being used to produce the EMF spike? You show the current as an exponential decay through the winding resistance as though the terminals of the solenoid coil were shorted together. But that is a method to avoid producing any EMF spike. So how exactly is the current through...
  16. L

    Sine wave for a resistance / reactance circuit

    A steady-state sine wave is characterized only by magnitude and phase, whether on a phasor diagram or on a time axis. Of course it is easier to plot sine waves on a phasor diagram, but just sketching them on a time axis isn't so bad either (just identify the peaks and zero crossings). But to...
  17. L

    Sine wave for a resistance / reactance circuit

    It is not exactly clear what the assignment means by 'sine wave' and how you are expected to plot one; however, since you are working with phasor diagrams it would be reasonable to consider how a sine wave is plotted on a phasor diagram. That would be a straight line with magnitude and phase...
  18. L

    Volt drop in a reactance / resistance circuit

    What I got for the current is I= 5/13 -j(1/13), |I|= sqrt(2/13) = 0.39223227 I don't see any problem with your calculations.
  19. L

    Volt drop in a reactance / resistance circuit

    Capacitors and inductors do not have a reactance value unless in the steady-state AC domain. Nor are phasor diagrams used unless in the steady-state AC domain. So was the original problem given with a battery symbol for the AC power source? Or was it the OP's idea to represent the AC voltage...
  20. L

    What Is the difference between capacitance and voltage ?

    Even though we say that a capacitor stores charge, how often do you stop to consider that a charged capacitor and a discharged capacitor both contain the exact same amount of electrical charge? A surplus of charge on one capacitor plate is balanced by an equal deficit of charge on the other plate.
View older results
Top