Electronics Obstacle Course - Revision history

Bsboggs: /* Diodes */

2023-11-30T20:07:53Z

‎Diodes

Bsboggs: /* Optoelectronics */

2023-05-05T17:22:29Z

‎Optoelectronics

Bsboggs: /* Diodes */

2023-01-17T23:10:06Z

‎Diodes

Bsboggs: /* Resistor & Capacitor Basics */

2018-10-22T16:47:02Z

‎Resistor & Capacitor Basics

Bsboggs: /* Resistor & Capacitor Basics */

2018-10-19T21:48:16Z

‎Resistor & Capacitor Basics

Bsboggs: /* Resistor & Capacitor Basics */

2018-10-19T21:43:51Z

‎Resistor & Capacitor Basics

Bsboggs: /* Resonant circuits */

2018-05-30T19:02:49Z

‎Resonant circuits

Bsboggs: /* Resonant circuits */

2018-05-29T22:30:52Z

‎Resonant circuits

Bsboggs: /* Activities */

2018-05-18T20:07:50Z

‎Activities

Bsboggs: /* RF Circuits and PCBs */

2018-05-18T20:04:52Z

‎RF Circuits and PCBs

@@ Line 136: / Line 136: @@
 # Using a (current limited) voltage supply, apply voltages from 0-10VDC to the cathode (anode grounded) and plot the result. This is the reverse I-V curve for the diode. The diode is said to be "reverse biased" in this situation.
 ## There should be a "knee" in this curve too where the diode starts to conduct in the reverse direction. About what voltage is this?
-## Are the forward and reverse "turn on" voltages symmetric about 0V?
+## Are the forward and reverse "turn on" voltages symmetric about 0V?<br><br><br>
-# Construct the diode clamp circuit shown at the right.[[File:Diode_clamp.jpg|thumb| Diode Clamp|100px]]
+# Construct the diode clamp circuit shown at the right.[[File:Diode_Clamp.png|wiring|400px|right]]
 ## Apply input voltages from 0-10VDC and plot the output voltage vs. input voltage.
 ## Does the diode clamp earn its name?
-## Can you explain the maximum output voltage?<br><br><br><br>
+## Can you explain the maximum output voltage?<br><br><br><br><br><br><br><br><br><br>
 # Employ an AC voltage divider with a resistor and the P6KE6.8 to measure the diode's capacitance as a function of bias voltage. [[File:Voltage_Divider.png|100px|right]]This diode capacitance issue will play a role later on when we encounter optoelectronic devices. In the AC voltage divider shown at the right the C indicates the capacitance of the diode. That is, don't put a capacitor where "C" is but the P6KE6.8 diode with its cathode grounded. Apply a 20mV AC sinusoidal signal with varying (positive to the anode) DC offsets (larger than 20mV) to the input. The DC offset is the diode's bias voltage. Look for amplitude changes to the AC signal at the output. With the voltage divider formula and the formula for the impedance of a capacitor you should be able to plot the diodes capacitance Cd as a function of bias voltage (the DC offset).
 ## Does the diode's capacitance decrease of increase with positive bias voltages?

@@ Line 293: / Line 293: @@
 V.
-# Put together this LD CC circuit with V(-) at ground, V(+) at 7VDC, a 1K pot, , R = 30Ohms, C = 10<math>\mu</math>f and a  P6KE6.8 diode (oriented the correct way).
+# Put together this LD CC circuit with V(-) at ground, V(+) at 7VDC, a 1K pot, , R = 30 Ohms, C = 10<math>\mu</math>f and a  P6KE6.8 diode (oriented the correct way).
 ## Test the CC circuit with an LED (cathode grounded).
 ## Does the circuit light up the LED? If yes, proceed. If not, troubleshoot the circuit.

@@ Line 128: / Line 128: @@
 [[File:Diodecathan.png|right|Diode]]
-# Put a [[Media:P6KE6.8.pdf| P6KE6.8]] diode in series with a MM in ammeter mode and ground the anode.
+# Put a (6V) Zener Diode in series with a MM in ammeter mode and ground the anode.
 ## Apply 0.7VDC to the cathode and measure the current through the diode.
 ## Now ground the cathode and apply 0.7VDC to the anode and measure the current through the diode.

@@ Line 53: / Line 53: @@
 ## How might the MM measure a voltage?
 ## What can you say about the MM's "internal" resistance when it measures a voltage?
-# With a function generator put a 2.5VAC (peak-to-peak) sinusoidal voltage at frequencies of 50, 500 and 1000Hz '''across''' a ~ 10k Ohm resistor.
+# With a function generator put a 5VAC (peak-to-peak) sinusoidal voltage at frequencies of 50, 500 and 1000 Hz '''across''' a ~ 5k Ohm resistor.
 ## Using the MM in voltage mode measure the AC voltage. Does it vary with frequency?
 ## Using the MM in current mode measure the AC current. Does it vary with frequency?<br><br><br>

@@ Line 40: / Line 40: @@
 ## What is the resistance of two 100 Ohm resistors in series? How do resistors in series add?
 ## What is the resistance of two 100 Ohm resistors in parallel? How do resistors in parallel add?
-## How does the MM measure the resistance?
+## How might the MM measure the resistance?
 ## What can you say about the "internal" resistance of the MM in resistance measurement mode?[[File:Pb-505.jpg|right|100px|thumb|proto-board]]
 ## Using a proto-board and one of the 100 Ohm resistors put 2.5VDC '''across''' the resistor. Calculate the current. Use the MM in ammeter mode to measure the current. Are the calculated and measured values close? Does the power applied to the resistor fall within the power rating of the resistor? What is power? What could happen if you applied too much power to the resistor?
 ## What is current?
-## How does the MM measure current?
+## How might the MM measure current?
 ## What can you say about the "internal" resistance of the ammeter used in the measurement of the current?
 ## How do the MM wire leads effect these measurements?
@@ Line 51: / Line 51: @@
 ## What power is being applied to the resistor? Calculate the voltage '''across''' the resistor. With the MM measure the voltage across the resistor. Are these values close?
 ##What is voltage?
-## How does the MM measure a voltage?
+## How might the MM measure a voltage?
 ## What can you say about the MM's "internal" resistance when it measures a voltage?
 # With a function generator put a 2.5VAC (peak-to-peak) sinusoidal voltage at frequencies of 50, 500 and 1000Hz '''across''' a ~ 10k Ohm resistor.
@@ Line 62: / Line 62: @@
 ## What is the capacitance of two 0.1 <math>\mu</math>f capacitors in series? How do capacitors in series add?
 ## What is the capacitance of two 0.1 <math>\mu</math>f capacitors in parallel? How do capacitors in parallel add?
-## How does the capacitance meter measure the capacitance?
+## How might the capacitance meter measure the capacitance?
 ## Using a proto-board apply 2.5VDC '''across''' an 0.1 <math>\mu</math>f capacitor and 100 Ohm resistor in series. Using a MM measure the voltage '''across''' the entire capacitor + resistor series network. Measure the voltage across the capacitor only. Measure the voltage across the resistor only. Explain the measured voltage across the resistor.
 ## Now apply a 2.5VAC sinusoidal voltage '''across''' the capacitor + resistor network at 50, 500 and 1000 Hz.

@@ Line 105: / Line 105: @@
 [[File:LR_Bandpass_filter.jpg|thumb|right|LC resonant circuit - bandpass filter|150px]]
 # Construct the circuit shown at the right using a 500 Ohm resistor, 1mH inductor and a 10uf capacitor.
-## Apply a 1VAC sinusoidal input voltage at frequencies between 10 and 3000Hz and plot the output voltage as a function of frequency.
+## Apply a 1VAC sinusoidal input voltage at frequencies between 10 and 6200Hz and '''plot''' the output voltage as a function of frequency.
 ## At what frequency is the response of the circuit maximum?
 ## Use QUCS or LTSpice to simulate this circuit. These software programs are on the lab desktop computers (or you can put them on your own laptop. You can find information on the programs in these links [http://qucs.sourceforge.net/ QUCS] and [http://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html LTSpice]. Consult with the instructor or TA concerning how to do this and what the results should look like.
 ## Explain the response of this circuit based on what you've learned about capacitors and inductors.
 ## When would a circuit with a response like this be useful?
-##Can you think of an optical-cavity analogy?<br><br><br><br>
+<br><br><br><br>
 ==== Impedance and Reactance ====

@@ Line 147: / Line 147: @@
 ## Does the diode's capacitance change much for reverse bias voltages?
 <br><br><br><br>
 ==== Transistors ====

@@ Line 233: / Line 233: @@
 * Read Chapter 1 of ''RF Circuit Design'' by Chris Boswick (on bookshelf in lab).
-# Why discrete-component electronic circuits behave badly at RF frequencies (>= 10MHz).
+# Why do discrete-component electronic circuits behave non-ideally at RF frequencies (>= 10MHz).
 # What can be done about this?
-# Build a discrete-component RLC tank circuit on a protoboard and observe its behavior go from ideal (at low frequencies) to non-ideal (at high frequencies).
+# Build two discrete-component RLC tank circuit on a protoboard. One at resonant a ("low") frequency (500kHz) and one at a ("high") resonant frequency (30 MHz).
-# Create and populate a ground-plane PCB of the same circuit as above. Test its behavior at both low and high frequencies. [[How_To_Make_a_PCB | Read this on PCB construction]]
+## Plot the Vout vs frequency of the  low-frequency tank circuit. Does it behave as expected?
 ==== Optoelectronics ====