PHY3722C: Electronics

Course Description

PHY3722C Electronics is the physics major's course in circuits and instrumentation — how to design, build, measure and debug the electronic apparatus that experimental physics runs on.

The course is offered at approximately five Florida institutions, including Florida Atlantic University, Florida International University, the University of Central Florida, the University of North Florida and the University of West Florida.

The University of West Florida places it in the College of Science and Engineering, Department of Physics at 3 semester hours, requires PHY 2049 (the calculus-based electricity and magnetism course), and describes "an introductory course in electronic design and circuitry with emphasis on common instrumentation," noting explicitly that it has both lecture and laboratory components. Florida International University carries it as Electronics at 3 credits.

The C suffix is the important part of the course code here, and UWF's description spells out why: this is an integrated lecture-and-laboratory course, not a lecture with a separate lab section. The theory and the bench work are the same course, taught together, and that structure is not incidental — electronics is a subject you cannot learn without building things, because the gap between a circuit that works on paper and a circuit that works on a breadboard is where the actual content lives.

What distinguishes a physics electronics course from an electrical engineering one. This is worth being clear about, because students sometimes expect the wrong thing. An electrical engineering circuits sequence is deeper and more mathematical: it develops phasor analysis, transfer functions, Laplace-domain methods and a systematic design methodology over two or three semesters. This course is broader and more practical over one semester. It aims at a physicist who needs to read a circuit, build an amplifier, condition a signal from a detector, understand what an oscilloscope is actually showing, and find the fault when the apparatus does not work. It is engineering in service of measurement.

The arc of the course is standard and well established. It begins with DC circuit analysis — Ohm's law, Kirchhoff's laws, Thévenin and Norton equivalents — then moves to AC circuits, reactance, impedance and filters. Then come the semiconductor devices: diodes, then transistors as switches and amplifiers. The operational amplifier is usually the centrepiece, because it is the single most useful component a working physicist handles and because op-amp circuits illustrate feedback beautifully. Most versions finish with digital electronics — logic gates, flip-flops, counters — and increasingly with a microcontroller section on data acquisition and interfacing.

Why physics departments insist on this course. Experimental physics is instrumentation. A detector produces a small, noisy analogue signal; getting a number out of it requires amplification, filtering, digitisation and an understanding of where the noise comes from. A physicist who cannot do that is dependent on someone who can — and in a research group, at a national laboratory, or in an industrial lab, that dependency is limiting. Graduates consistently report this as one of the two or three most immediately employable courses in the physics degree, and the reason is simply that it produces a demonstrable, transferable skill.

Learning Outcomes

Required Outcomes

• Analyse DC circuits using Ohm's law, Kirchhoff's voltage and current laws, and series-parallel reduction.
• Apply Thévenin and Norton equivalents and the superposition principle to simplify a network.
• Explain and apply the voltage divider and the concepts of input and output impedance, and predict loading effects.
• Analyse AC circuits using reactance and complex impedance; compute the response of RC, RL and RLC networks.
• Design and analyse passive filters — high-pass, low-pass, band-pass — and interpret a frequency response and Bode plot.
• Explain the operation of a diode and analyse rectifier, clipping and regulator circuits.
• Explain the operation of bipolar junction and field-effect transistors and analyse basic amplifier and switching configurations.
• Analyse and design operational amplifier circuits — inverting, non-inverting, summing, difference, integrator, differentiator, comparator.
• Explain negative feedback and its effect on gain, bandwidth, stability and impedance.
• Operate laboratory instrumentation competently: oscilloscope, function generator, digital multimeter, regulated power supply.
• Build a working circuit on a breadboard from a schematic, and read a schematic accurately.
• Troubleshoot systematically — isolate a fault by measurement rather than by inspection or replacement.
• Interpret a component datasheet and select parts against specification and tolerance.
• Explain the principal sources of noise in a measurement and apply basic mitigation — grounding, shielding, bandwidth limiting.
• Keep a laboratory record adequate for someone else to reproduce the measurement.
• Work safely with electrical apparatus, including correct grounding practice.

Optional Outcomes

• Design and analyse digital logic circuits — gates, Boolean simplification, combinational logic.
• Analyse sequential logic — flip-flops, registers, counters, state machines.
• Explain analogue-to-digital and digital-to-analogue conversion, sampling, quantisation and aliasing.
• Program a microcontroller (Arduino, Raspberry Pi Pico or similar) for data acquisition and instrument control.
• Use circuit simulation software (SPICE, LTspice, Multisim) and compare simulated to measured behaviour.
• Explain lock-in detection and phase-sensitive measurement of small signals.
• Design and characterise active filters and oscillators.
• Explain transmission line behaviour, impedance matching and termination at high frequency.
• Use LabVIEW, Python or MATLAB for instrument control and automated data collection.
• Design a printed circuit board from a schematic using EDA software.
• Complete an independent design project from specification to working prototype.

Major Topics

Required Topics

• DC circuit analysis — Ohm's law, Kirchhoff's laws, network reduction, Thévenin and Norton equivalents.
• Impedance and loading — voltage dividers, input and output impedance, source and load matching.
• AC circuits — sinusoidal steady state, reactance, complex impedance, phase.
• Frequency response and filters — RC and RL filters, cutoff frequency, Bode plots, resonance.
• Diodes — the pn junction, rectification, regulation, protection.
• Transistors — BJT and FET operation, biasing, common-emitter and common-source amplifiers, switching.
• Operational amplifiers — the ideal op-amp, the standard configurations, real-device limitations.
• Feedback — negative feedback, gain-bandwidth product, stability.
• Instrumentation — oscilloscope operation, triggering, probes and probe compensation, function generators, meters.
• Noise and signal integrity — thermal and shot noise, ground loops, shielding, signal-to-noise ratio.
• Laboratory practice — breadboarding, schematic reading, systematic troubleshooting, documentation, electrical safety.

Optional Topics

• Digital logic — gates, Boolean algebra, combinational design.
• Sequential logic — flip-flops, counters, timers, state machines.
• Data conversion — ADCs, DACs, sampling theory, aliasing.
• Microcontrollers and embedded interfacing.
• Circuit simulation — SPICE modelling and its limits.
• Active filters and oscillators.
• Power supplies — linear and switching regulation.
• Lock-in amplifiers and small-signal recovery.
• High-frequency effects — transmission lines, matching, parasitics.
• Computer-controlled instrumentation — GPIB/USB interfacing, LabVIEW or Python automation.
• PCB design and fabrication.
• Independent design project.

Resources & Tools

• The standard text is Horowitz and Hill, The Art of Electronics (3rd edition, Cambridge) — not a conventional textbook but the reference practising physicists and engineers actually keep on the bench. Its companion, Learning the Art of Electronics: A Hands-On Lab Course (Hayes and Horowitz), is built around exactly this kind of course and is increasingly assigned as the primary text.
• Other adopted texts: Simpson, Introductory Electronics for Scientists and Engineers — written for precisely this audience; Diefenderfer and Holton, Principles of Electronic Instrumentation; Scherz and Monk, Practical Electronics for Inventors — informal, well illustrated, popular with students.
• Laboratory instruments: digital storage oscilloscope, function/waveform generator, bench digital multimeter, regulated DC power supply, and increasingly a USB logic analyser. These are the instruments of the trade and fluency with them is a large part of the course's value.
• Components and construction: solderless breadboards, jumper kits, resistor and capacitor assortments, 741 and TL07x-series op-amps, 2N3904/2N7000-class transistors, 1N4148 and 1N400x diodes, 555 timers, 74HC-series logic. Some courses require a personal parts kit; check before the first week.
• Simulation software: LTspice (Analog Devices, free) is the most widely used; Multisim and CircuitLab appear where the institution licenses them; Falstad's circuit simulator (free, browser-based) is excellent for building intuition quickly.
• Microcontroller platforms where the course includes them: Arduino Uno or Nano, Raspberry Pi Pico, or an STM32 development board — all inexpensive and well documented.
• Datasheets are a primary source in this course. Manufacturer sites (Texas Instruments, Analog Devices, ON Semiconductor) and distributor catalogues (Digi-Key, Mouser) are where the real specifications live, and reading them is an assessed skill.
• Free reference material: All About Circuits (allaboutcircuits.com) textbook series; MIT OpenCourseWare circuits courses; the EEVblog archive for practical bench technique.

Career Pathways

This is among the most directly employable courses in a physics degree, and unusually for a physics course it produces a skill an employer can name.

• Physicists and research staff (SOC 19-2012) — instrumentation competence is close to a prerequisite for experimental research work at any level.
• Electrical and electronics engineering technologists and technicians (SOC 17-3023) — a physics graduate with this course is a credible candidate for test, characterisation and instrumentation roles.
• Electronics engineers (SOC 17-2072) — with an engineering degree or substantial additional coursework; the course is a genuine bridge for physics majors considering that move.
• Aerospace and defence test engineering — Florida's concentration is significant: L3Harris (Melbourne and Palm Bay), Lockheed Martin (Orlando), Northrop Grumman (Melbourne and St. Augustine), Raytheon/RTX, and the Space Coast contractor base around Kennedy Space Center and Cape Canaveral Space Force Station — Blue Origin, SpaceX, Boeing, Jacobs and Amentum among them.
• Semiconductor and photonics — Florida's photonics cluster centres on CREOL at UCF, with associated companies in Orlando; semiconductor test and characterisation roles draw directly on this material.
• Medical device engineering and biomedical instrumentation (SOC 17-2031) — device manufacturers across the Tampa Bay, Miami and Jacksonville corridors.
• Calibration, metrology and test laboratories (SOC 17-3029) — accredited calibration work is a stable and under-recognised career with direct relevance.
• National laboratory and large-facility technical staff — the National High Magnetic Field Laboratory at FSU in Tallahassee is the major Florida example, and its instrumentation groups hire people with exactly this background.
• Graduate study in experimental physics, applied physics, electrical engineering or optics — admissions committees for experimental groups read this course on a transcript as evidence the applicant can work in a laboratory.
• Physics and engineering-technology teaching (SOC 25-1054, 25-2031).

Special Information

Course format — the C suffix and what it means for your schedule

3 credits, 60 contact hours. The C suffix in the Statewide Course Numbering System denotes an integrated lecture-and-laboratory course, and UWF's description confirms the structure explicitly. In practice this normally means roughly two hours of lecture and three of laboratory per week, or a comparable blended arrangement in which the class moves between explanation and the bench in the same session.

⚠ The scheduling consequence is real. A C course occupies more hours in the timetable than its credit value suggests — five contact hours a week for three credits — and laboratory blocks are long and hard to move. Schedule this course first and fit the rest of the term around it, particularly if you are working or commuting.

Expect 8–10 hours per week outside class. The laboratory reports are the main load, and the honest warning is that circuits do not work the first time. Debugging is not wasted effort — it is the skill being taught — but it consumes hours unpredictably, and students who start a laboratory exercise the night before it is due tend to discover this the hard way.

Prerequisites and position in the curriculum

UWF requires PHY 2049 — the second semester of calculus-based physics, covering electricity and magnetism. That prerequisite is genuine content, not a maturity proxy: the course assumes you already know what capacitance, inductance, and RC time constants are, and it builds from there rather than deriving them.

The implied chain matters for planning: PHY 2048 → PHY 2049 → PHY 3722C, with MAC 2311 and MAC 2312 running alongside. Complex numbers are used routinely for AC analysis, so comfort with them is assumed even where no mathematics course is formally required beyond calculus.

The course normally sits in the junior year, typically alongside or just before the intermediate physics laboratory (PHY3802L) and modern physics. Taking electronics before or with the intermediate laboratory is the better order, because several of the advanced laboratory's experiments assume you can already use an oscilloscope and understand what a signal-conditioning stage does.

⚠ What students find hardest

• The gap between theory and the bench. A circuit analysed correctly can still fail to work — because of a real component's tolerance, a parasitic capacitance, a bad breadboard contact, or an instrument setting. Closing that gap is the course, and students who treat a non-working circuit as a failure rather than as the assignment struggle unnecessarily.
• Oscilloscope fluency. The instrument has many controls and an unhelpful failure mode: it shows you something plausible when it is set wrongly. Triggering and probe compensation cause most of the early confusion. Time spent deliberately learning the instrument in week two pays back all semester.
• Systematic troubleshooting. The instinct is to change components until something works. The method is to measure at successive nodes and bisect — to find where the signal is still right and where it has gone wrong. This is a teachable discipline and it is the single most transferable thing in the course.
• Reading datasheets. Students expect a component to be defined by its name; it is defined by its specification, and two parts with the same part number from different manufacturers can behave differently at the margins.

Articulation and transfer

PHY3722C is a 3000-level upper-division course and is not offered at Florida College System institutions. It is taken after transfer to a university, in the junior year.

Within Florida the number is used consistently at the five institutions that carry it, so SCNS articulation is clean.

⚠ The suffix is the thing to watch on any substitution request. If a receiving institution's requirement is for PHY3722C and you have taken a lecture-only electronics course elsewhere, the laboratory component is the part that will be questioned — and reasonably so, since it is most of the course's value. Keep the syllabus and, if you have one, the laboratory manual.

⚠ Do not assume an engineering circuits course substitutes automatically. An EEL-prefix circuits course (for example EEL3111C) covers overlapping material at greater depth, and departments frequently do accept it — but it is a substitution decision, not an articulation, because the numbers differ. Ask the physics department before assuming, and ask before taking the course rather than after.

Related courses in the physics sequence

• PHY2049 — calculus-based electricity and magnetism; the prerequisite.
• PHY3802L — intermediate physics laboratory; the companion laboratory course, normally taken in the same year.
• PHY4323/PHY4324 — electricity and magnetism at the theoretical level; a different subject from this course despite the shared vocabulary, and considerably more mathematical.
• PHY4822L — advanced laboratory, where this course's instrumentation skills are assumed.

AI Integration

AI tools have a real and specific place in electronics work, and an equally specific set of failure modes. Both are worth knowing before you rely on either.

Where they genuinely help. Language models are competent at explaining what a circuit topology does when you are handed an unfamiliar schematic, at suggesting where to start looking when a circuit misbehaves in a described way, at generating microcontroller code for data acquisition and instrument control, and at interpreting a datasheet parameter whose meaning is not obvious. For the microcontroller and automation portions of the course in particular, model-assisted coding is now normal practice in laboratories and there is no reason to pretend otherwise.

Simulation is the more important tool. LTspice and its equivalents are not AI, but they are the computational aid that actually changes how this course is done: build the circuit in simulation, see the frequency response, then build it on the bench and find out where reality differs. The difference between the two is where the physics is, and a student who uses simulation to predict rather than to replace measurement gets the most out of both.

Where AI tools fail, concretely.

• They confuse component values and pin assignments. A model will confidently give a pinout that is wrong, and a wrong pinout on a powered circuit destroys parts. Verify every pin against the manufacturer's datasheet — not against the model, and not against a hobbyist blog.
• They ignore real-device limitations. Model-produced designs routinely assume ideal op-amps: infinite gain, no offset, unlimited slew rate, no output current limit. Those assumptions are exactly what the course exists to teach you to question.
• They cannot debug your circuit. A model has not seen your breadboard, your grounding, or your probe placement, and the fault is very often in one of those. Diagnosis requires measurement, and no amount of description substitutes for putting a probe on a node.
• They are weak on high-frequency and parasitic behaviour, which is where practical electronics gets difficult.

⚠ Safety note, and it is not a formality. Do not build a mains-connected or high-voltage circuit from AI-generated instructions. Bench-supply work at low voltage is forgiving; mains voltage and charged high-value capacitors are not. Follow your laboratory's safety rules and your instructor's direction, which take precedence over any tool.

Academic integrity. Policies vary — read the syllabus. In a laboratory course the line usually falls in a recognisable place: using a model to understand a concept or to help write analysis code is normally acceptable; generating a laboratory report about measurements you did not take is fabrication, which is a more serious offence than plagiarism in a scientific context because it corrupts the data record itself. Report what you measured, including when it disagreed with theory — a report that honestly documents a circuit that did not work and explains why is worth more, and is normally graded higher, than a tidy report of results that were expected rather than observed.