Lab 2: Experiment 4 Kirchoff’s Laws Circuits to be Constructed Circuit from Lab ManualCircuit from Instructions.

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Presentation transcript:

Lab 2: Experiment 4 Kirchoff’s Laws

Circuits to be Constructed Circuit from Lab ManualCircuit from Instructions

Trim Potentiometers Trim pots, for short – A resistor whose values depends on the position of the wiper (middle terminal – Pin 2). Used as a voltage divider – All three terminals are connected in the circuit. Used as a variable resistor – Either pins 1 and 2 or 2 and 3 are connected in the circuit.

Pinout Pins 1 and 3 are labeled on the top surface of the trim pot. – The resistance between pins 1 and 3 is the maximum resistance of the trim pot (R pot ). The middle pin (2) is connected to the wiper. – The resistance between pins 1 and 2 is x R pot, where x is the fraction of the total number of turns of the knob. – The resistance between pins 2 and 3 is (1 – x) R pot, where x is the fraction of the total number of turns of the knob. – There may be a notation on the top surface about the direction that the knob should be turned [Clockwise (CW) or Counterclockwise (CCW)] to increase the value of the resistance between pins 1 and 2 and decrease the value of the resistance between pins 2 and 3.

Reading the Value of Your Trim Pot On one surface of the pot are markings – The maximum resistance of the trim pot – The part number The value of the resistance is calculated as follows: – The first two digits of the three digit number is the number that is then multiplied by 10 raised to the third digit. » For example: 102 = 10 x 10 2 = 1 k 

Pspice Symbol POT: Trim Pot R_Var: Variable Resistor

PSpice Simulations Bias Point and DC Sweeps

Bias Point Single calculation of the steady-state currents and voltages in the circuit. – If only d.c. sources are present, then the values are the d.c. currents and voltages. – If only a.c. sinusoidal sources are present, then the values are the average a.c. currents and voltages (i.e., 0A and 0V since the average of sinusoid is zero).

DC Sweep Calculations of voltages and currents as the value of one or more components are varied. – The component can be a voltage or current source, a resistor, a parameter within a device model, or the ambient temperature, which causes changes in all temperature sensitive components. – Plots of voltages and currents as a function of the changing value of the component are automatically made when voltage or current markers are placed on the schematic.