for connection to potentiometer circuit (Radio Shack catalog # 274-662 or equivalent) This is a project useful to those who want a precision potentiometer without spending a lot of money. Ordinarily, Measure voltage between the potentiometer’s wiper terminal and the “ground” point shown in the schematic diagram (the negative terminal of the lower 6-volt battery). This is the input voltage for the “DC Metering Circuits” This experiment explores the different resistance ranges obtainable from combining fixed-value resistors with a potentiometer connected as a rheostat. To begin, connect a 10 kΩ Two 6 volt batteries One potentiometer, single turn Examine the following schematic to see how the potentiometric voltmeter method is implemented: The circle symbol with the word “null” written One NPN transistor—models 2N2222 or 2N3403 recommended (Radio Shack catalog # 276-1617 is a package of fifteen NPN transistors ideal for this and other experiments) Two 6-volt batteries Two 1 kΩ A linear-taper potentiometer works quite well. Lessons In Electric Circuits, Volume 1, chapter 8: “DC Metering Circuits” Lessons In Electric Circuits, Volume 1, chapter 10: “DC Network Analysis” (in .
Note the range of possible output voltages with each feedback scheme (the low and high voltage values obtained with a full sweep of the input voltage potentiometer), and how this differs between the .
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