Download 1.1 Introduction

Dusk to Dawn
Worksheet (100 pts)
I.
Name:
Pre-lab:
b) Provide below the range of threshold voltages for ZVN2110. (5 pts)
c) Provide below typical forward voltage and current for LED. (5 pts)
d) In the space below, provide your mathematical relationship between gate voltage,
photoresistor resistance, fixed resistance, and source voltage. (10 pts)
II. MOSFET/LED Characterization
b) Attach to this worksheet your table of gate voltages vs. drain currents and a plot of the
drain current vs. gate voltage. In the space below, provide your estimate of the gate
voltage required to turn on the LED. (15 pts)
c) In the space below, discuss your measured gate voltage compared to the values in the
data sheets of part one. Comment on the level of agreement between your
measurements and the expected values from the prelab. (8 pts)
d) DEMO: Have a teaching assistant initial this sheet, indicating that they have observed
your circuit’s operation. (7pts)
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©2015, Tim Hanshaw
Dusk to Dawn
Worksheet (100 pts)
Name:
III. Photocell Characterization and Design Task
a) In the space below, list the photocell resistance under light and dark conditions. (5 pts)
b) Provide below your estimate of the fixed resistance, R, which will allow the circuit to
function correctly. (15 pts)
c) Provide below the expected gate voltages the circuit you designed in part IIIb above will
experience under light and dark conditions. (10 pts)
IV. Circuit Integration
b) In the space below, provide your measured gate and diode voltages for light and dark
conditions. Also comment on the agreement between your measured values and your
expectations from Part III and the data sheets of the prelab. (10 pts)
c) DEMO: Have a teaching assistant initial this sheet, indicating that they have observed
your circuit’s operation. (10pts)
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©2015, Tim Hanshaw