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In some cases, we need amplifiers that have high gain when the input voltage is low and decreasing gain as the input voltage increases. So this is an amplifier whose gain depends upon the input voltage! An op amp circuit such as that in Figure 51 can provide this response. Here diodes are used to isolate feedback resistors via their forward voltage drop until the output voltage rises above predefined levels.
For the circuit in given Figure, assume the forward voltage drop of the diodes is 1.4 V (i.e., they do not begin to conduct until the voltage across them is above 1.4 V). Prepare a plot of output voltage versus input voltage for this circuit.
(Hint: When diode begins to conduct, the output must be V, and this effectively just puts the 100- resistors in parallel.)
A space probe is launched from Earth, headed for deep space. At a distance of 10,000 miles from Earth's center, the gravitational force on the space probe is 520 pounds. If the gravitational force acting on the probe is proportional to 1/d2, what ..
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What are the causes of excessive ground vibrations during rock blasting?
A Styrofoam box has a surface area of 0.87 m2 and a wall thickness of 2.0 cm. determine the thermal conductivity of the Styrofoam
Capacitors C1 = 5.65 µF and C2 = 2.75 µF are charged as a parallel combination across a 250 V battery. Calculate the resulting charge on each capacitor
While an elevator of mass 832 kg moves downward, the tension in the supporting cable is a constant 7730 N. What is the elevator's speed at t = 7.00 s
A mass spectrometer is used to examine the isotopes of uranium. Ions in the beam emerge from the velocity selector at a speed of 3.02 105 m/s and enter a uniform magnetic field of 0.625 T directed perpendicularly to the velocity of the ions.
A rope of mass M and length L0 lies on a frictionlesstable with a length 'l' initially hanging ove theedge. How fast is the rope moving
Suppose a rock is launched straight upward with a speed of 24.83 m/s from the surface of another planet. 2.95 seconds later, the rock has reached apogee. What is the acceleration due to gravity on the surface of that planet?
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