PHYS3330Electronics Laboratory

Lecture A 15 January 2019

Your main source of course information: course web site

http://www.colorado.edu/physics/phys3330/

PHYS3330 course overview: people

• Instructors:• Prof. Noel Clark, Office: Gamow Tower F613

• email: noel.clark@colorado.edu, Phone: (303) 492-6420• Prof. Stephen Wagner, Office: Gamow Tower F417

• email: stephen.wagner@colorado.edu, Phone: (303) 735-3315• Prof. Eric D. Zimmerman, Office: Gamow Tower F421

• email: edz@colorado.edu, Phone: (303) 735-5338• Learning Assistants:

• Nic Johnson• email: nijo5747@colorado.edu

• Dylan Wharton• email: dywh8174@colorado.edu

• Lab coordinator: (responsible for equipment and supplies):• Michael Thomason, Office: Duane G-2B78

PHYS3330 weekly schedule

• Section 101: Tuesday 2-5. Primary instructor Clark.

• Section 102: Thursday 9-12. Primary instructor Zimmerman.

• Section 103: Thursday 2-5. Primary instructor Wagner.

• You must attend your own section. Participation and attendance count.

• Lectures: Tuesday and Thursday 1-1:50, (first 9 weeks)

• Exam review, exam in class (details TBA).

• All other times: your ID card will allow access to the lab.

• Office hours by appointment.

What will we be doing this semester?

✿ Introduction to basic building blocks for electronic circuits:

•  Passive components (R, C, L):

à passive circuits (voltage dividers, & filters, etc.)

•  Active components (Transistors, operational amplifiers etc.)

à active circuits (amplifiers, oscillators, STMs etc.)

•  Digital circuits (logic-gates, microcontrollers, arduino)

✿ Learn the characteristics of each elements and the design principles based on them.

✿ Learn how to design and analyze circuits.

What will we be doing this semester?

• This class is an exercise in experimental physics

Things to complete this week:

• Mathematica training:

• Lab Skills Activity #1. Due in Canvas by Sunday night.

• Lab Skills Activity #2. Due in Canvas next Sunday night (Jan 27).

• Lab Notebook Scans and Reports due 2 days before the next lab on Canvas (11:59 PM Sun for Tues Lab, 11:59 PM Tues for Thurs Labs).

• For Labs ≥2: Lab preps are due midnight the night before your lab section

• Due dates, etc. will not be announced in lecture in the future!.

Notebook scans and other work to be turned in

• We only accept .pdf files.

• Do not turn in Word or Mathematica files.

• One PDF for the entire assignment (not separate files for each page, or for writing and plots)

• Notebook pages should be neat, organized by section, and well-scanned.

• Scanned files should not be too large. File should not get bigger than a few MB. (Avoid high-resolution settings, color scans if not necessary.)

• Always describe each section under its header. Points will be deducted for lack of explanatory text.

.nb .doc

Report

Schematic drawings

• Drawings should be schematics unless otherwise indicated.

• This means:

• Right angles

• Standard symbols for components

• No shapes of objects, etc.

NO

YES

A note on uncertainties

• We expect you to give basic uncertainty estimations for . This is not the same thing as percentage discrepancy.

• Discrepancy: Expect 4.77 V; Observe 5.23 V.

• Uncertainty: Expect (4.77±0.50) V; Observe 5.23 V. Result is about one standard deviation off. A useful statement.

• Note that there is nothing special about 5% discrepancy. Some measurements in this class can be very precise, and even 1% off is too much. Other measurements you might be lucky to get within 10%. You should assess the expected precision of each measurement you make!

|4.77� 5.23|4.77

· 100 = 9.6%

Notebook scans and turn-in

• Use the scanner in the lab, or scan with your phone• “Scan with your phone” doesn’t mean just take a photo

and paste it into a PDF.• You must use software that:

• Corrects for lighting• Corrects for perspective• Makes background white and text density uniform

• Suggestions:• GeniusScan, available at http://thegrizzlylabs.com• Scannable

A good scan:• Text is sharp and black• Background is uniform white• Lines/perspective are straight• One page per scan, not rotated

Projects

• It’s not too early to be thinking about your projects!

• Discuss project topics informally with us during the next several weeks.

• Generally, projects should have a good degree of challenge and have room for creativity. You should be doing most of the circuit design yourself! Some good project topics from previous semesters:

• Electrocardiogram

• Various analog computers

• Tesla coil (very difficult!)

• Data encryption device

• We discourage:

• Simple audio processing circuits (guitar pedals, etc)

• Simple digital circuits, or ones where the work is mostly programming

• Formulaic circuit designs from the WWW (pretty much all Theremins)

• Things that won’t work (no rail guns, no FM [100 MHz] radios)

A1.5

What is your experience with Mathematica?

A: never used it

B: used it a little for basic computation

C: used it for computation and plotting

D: used it a lot, but don’t feel like an expert

E: used it a lot and feel like an expert

A2

Who is responsible for your safety?

A: The US Government

B: The State of Colorado

C: The University of Colorado

D: The Physics Department

E: Yourself

A3

What is the most likely way a physicist will die at work?

A: Toxic chemicals

B: Explosions

C: Electrocution

D: Disgruntled graduate student

E: Plane crash

A4

What will kill you?

A: Current

B: Voltage

C: Power

• EFFECTS OF CURRENT (AC and DC)

• 10 to 20 mA painful sensation• 20 to 40 mA muscular paralysis, cannot let go• 40 to 80 mA breathing is difficult• 100 to 200 mA fibrillation of the heart and death• > 200 mA heart muscles are clamped.

• Recovery is possible with immediate first aid. • Be sure the power is off before touching a

helpless person!!!•  

•10 -100 mA can kill you!

•You will generally work with 15-30 V max.• Body internal resistance ~ 500 Ω• Dry skin resistance ~100k Ω• Wet skin resistance ~ much lower

A6

Is 15 V safe if you have dry hands?

A: YesB: No

A7

What is the easiest way to damage expensive equipment in the lab?

A: Applying too much voltage to itB: Plugging it in backwards

C: Spilling a drink on it

D: Dropping it

A7

What is the easiest way to damage expensive equipment in the lab?

A: Applying too much voltage to itB: Plugging it in backwards

C: Spilling a drink on it

D: Dropping it

Please don’t eat or drink at the benches. You may have drinks on the side table in

the lab by the blackboard.