Friday, March 11, 2011
Lab 3 - Voltage Dividers
In this lab we investigated the effects that multiple loads have on a circuit and in particular the effects that they have when used in conjunction with an unregulated power supply. Since switching multiple loads on/off in a circuit causes the voltage in an unregulated power supply to swing up and down, we attempted to design a circuit that would only have a voltage swing of +5% or -5% from 5V. Knowing that we were to have 3-1000ohm resistors hooked up in parallel for our various loads, we were able to calculate what the optimum voltage and resistance of the supply should be to stay within this +5|-5 range(V=5.54 & R=55.6ohm). Then, we hooked up the circuit and tested the actual loads to see how close we came. Our voltage swung 1.73 to 12.98%. This difference is likely due to the fact that our voltage was 6.05V rather than the true 5V supply desired and also because we used stock resistors which varied slightly from 1000ohms.
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