Damped Series-Parallel LC Circuit (L1) [5J30.10]
LC RLC - Damped Oscillations
The internal resistance of the components in this LC circuit is sufficient to cause damping. The inductance of the coil can be changed by inserting an iron core and the capacitance of the decade capacitor can be varied to affect the rate of damping. An oscilloscope is used to display the damped wave.
From the “High” output of the function generator, connect the 0.01 microfarad capacitor, and then split the connection coming out of the capacitor so as to wire the .1 H inductor (w/o core) and the decade capacitor in parallel. Ground circuit by connecting it back to the original output. The oscilloscope will measure the “out” of the 0.01 microfarad capacitor (refer to diagram below). Function generator should be set to output a square wave at 10Hz.
The internal resistances of the components is enough to cause damping in the LC circuit. By changing the capacitance of the decade capacitor or inserting an iron core into the inductor, the rate of damping may be increased or decreased (see below for an example of the observed damping in the circuit when there is an iron core inserted into the inductor vs without the iron core).
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