Experiment 19 PreLab

# Experiment 19 PreLab - y the current which was 9mA To find...

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Experiment 19 Lab Prepared By: Gabriela Velez Lab Instructor: Kathleen Meehan Date Performed: 10/14/10 Design A Voltmeter Objective: To design and construct a simple grpahical DC voltmeter that uses an LED bar graph as an output indicator. The circuit will also display the polarity of the voltage.

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Calculations of Resistor Values I found the resistors by finding the difference between the two values then dividing it by (2.52V-0V)/9 = 280 ohms (3.16V - 2.52V)/9 = 71.1 ohms (4V - 3.16V)/9 = 93.3 ohms (5.02V - 4V)/9 = 113.3 ohms (6.32V - 5.02V)/9 = 144.4 ohms (7.98V - 6.32V)/9 = 184.4 ohms (9V - 7.98V)/9 = 113.3 ohms

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Unformatted text preview: y the current which was 9mA. To find the resistors I needed to mak voltage divider I found the difference between two of the values and divid the current(9mA). Difference/Current = Resistance (2.52V - 0V)/9mA = .28mOhms so 28 (3.16 - 2.52)/9 = 71.1 Ohms (4 - 3.16)/9 = 93.3 Ohms (5.02 - 4)/9 = 113.3 Ohms (6.32-5.02)/9 = 144.4 Ohms (7.98 - 6.32)/9 = 184.4 Ohms (9-7.98)/9 = 113.3 Ohms These are the resistances that I foun created using other resistors in a ser circuit. ke the e ed by 80 Ohms nd and reis Pspice Schematic of Series Cicuit...
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