# Resistor Symbols Explained: Fixed, Variable, Thermistor, and Photoresistor Symbols Learn how to identify resistor symbols in circuit diagrams, including fixed, variable, thermistor, photoresistor, potentiometer, and rheostat symbols. Written by [Jharwin Barrozo](https://www.flux.ai/jharwinbarrozo) Published Oct 2026 - 8 min read ![Resistor Symbols Explained: Fixed, Variable, Thermistor, and Photoresistor Symbols](https://www.flux.ai/p/assets/blogs/resistor-symbols/main.webp) In short, a resistor symbol represents resistance in a circuit. The basic symbol can look like a zigzag line or a rectangle. Further, additional marks to the resistor symbol represent parts whose resistance can be adjusted or changes with temperature, light, or voltage (thermistors, photoresistors, and varistors). You do not need to memorize every variation before [reading a schematic](https://www.flux.ai/p/blog/how-to-read-pcb-schematics). Start with the symbol’s shape, then check its terminals, label, value, and connections. Together, those details tell you far more than the shape alone. | **Resistor type** | **What to look for** | | --- | --- | | Fixed resistor | A zigzag line or rectangle between two terminals | | Variable resistor | A resistor body with an arrow indicating adjustment | | Potentiometer | A resistor body with a third terminal for the movable wiper | | Rheostat | A variable resistor used through two terminals | | Thermistor | A resistor body with a temperature-dependent marking | | Photoresistor (LDR) | A resistor body with arrows pointing toward it to represent light | | Varistor | A resistor body with a voltage-dependent marking | ## Standard Resistor Symbols: IEC vs ANSI Two fixed-resistor symbols appear repeatedly in circuit diagrams: | **Convention** | **Simplified appearance** | **What it represents** | | --- | --- | --- | | ANSI-style | | A fixed resistor | | IEC | | A fixed resistor | The zigzag is commonly seen in North American schematics that follow American conventions. The rectangle is the resistor symbol used in the [IEC 60617 graphical-symbol system](https://webstore.iec.ch/en/publication/2723), which is common in international documentation. The two shapes **do not indicate different electrical behavior**. Rather, a 10 kΩ resistor remains a 10 kΩ resistor regardless of how its schematic body is drawn. For a new schematic, choose a convention and use it consistently. That makes the drawing easier to scan and helps reviewers distinguish intentional symbol variations from accidental inconsistency. If you are working within an existing design, follow its established convention unless your team has a reason to change the whole drawing. ## Symbols for Different Types of Resistors A fixed resistor has two terminals and a nominal resistance that is not intended to be adjusted during operation. Its schematic body is the zigzag or rectangle shown above. The value beside it—such as `330 Ω` or `10 kΩ`—usually matters more to circuit behavior than the choice of drawing convention. A **variable resistor** adds an arrow or similar adjustment mark to the resistor body. The mark tells you the effective resistance can change. The exact symbol of a variable resistor can vary by [symbol library](https://www.flux.ai/p/blog/pcb-symbol-design), so inspect the number of terminals and the circuit connections as well. A **potentiometer** has three terminals: both ends of a resistive element and a movable contact called the *wiper*. In a schematic, the wiper is normally shown as an arrow touching or pointing to the resistor body. When all three terminals are used, the part often forms an adjustable voltage divider. When laying out a physical circuit, confirm which footprint pad is the wiper; our [potentiometer wiring guide](https://www.flux.ai/p/blog/how-to-wire-a-potentiometer) walks through that mapping. A **rheostat** describes a variation of a [variable resistor](https://www.flux.ai/p/blog/6-types-of-variable-resistors-a-detailed-look-at-their-uses). More specifically, using the wiper and one end terminal to create an adjustable two-terminal resistance. A schematic might use a distinct rheostat symbol or show an ordinary potentiometer with only two terminals connected. When reading the schematic, do not assume the function of the rheostat based on the arrow alone. Instead follow the wires to understand how it is wired. A **thermistor** is a temperature-dependent resistor. Its symbol adds a temperature-related mark to the resistor body, although the precise notation varies among standards and libraries. The symbol alone may not tell you whether resistance decreases with temperature (NTC) or increases with temperature (PTC). Check the part label, specification, and manufacturer part number. A **photoresistor**, also called a light-dependent resistor or LDR, is commonly drawn as a resistor with two arrows directed toward it. The arrows represent incoming light, not electrical current. For example, IEC’s [photoresistor symbol entry](https://library.iec.ch/grasymb/grasymb.nsf/5FDC3327D03AD13DC125846A00501C93/%24FILE/IEC60617_Snapshot_2019-03-05.pdf) uses this visual cue. A **varistor** has resistance that changes with applied voltage. A common use case includes transient protection. The varistor symbol includes a voltage-dependent mark, but the exact form differs across libraries. Identify it by checking the label and part specification as well as the drawing. You can expect to see these often when reviewing a protection circuit. ## How Resistors Are Labeled in Circuit Diagrams The symbol identifies the component and the nearby text identifies the particular component in the design. Most schematics use **R** as the reference-designator prefix. For example, `R1`, `R2`, and `R3` are three separate resistors in the schematic, even if all have the same value. A potentiometer or other specialized part may use a different prefix in some libraries, so follow the project’s naming convention. Resistance is measured in ohms (`Ω`). Common values follow the E12/E24 series, such as 10, 22, and 47 times a power of ten. You may also see notation that places the multiplier where the decimal point would be: `4K7` means 4.7 kΩ, while `1M0` means 1.0 MΩ. Other properties may appear in the component details rather than beside the symbol. A resistor marked `R1 10 kΩ` could still require a particular tolerance, power rating, package, and temperature coefficient. For example, “10 kΩ, 1%, 0.1 W, 0603” (10,000Ω resistor, with 1% tolerance, 0.1W rating and 0603 package size) describes a more specific purchasing choice than “10 kΩ” alone. The schematic should make the electrical intent clear, while the bill of materials (BOM) should identify the actual part to source. Consider this simplified LED circuit: ![Schematic of a simple LED circuit: a 5 V source connects through resistor R1 (330 Ω) to LED1, and LED1 connects to GND](https://www.flux.ai/p/assets/blogs/resistor-symbols/body-1.png) `R1` is the resistor’s unique identifier. `330 Ω` is its nominal value. The LED and resistor are in series, so the resistor limits current through the LED. If another 330 Ω resistor appears elsewhere, it has its own designator, such as `R2`. A schematic’s identifiers allow engineers to associate each symbol to the correct BOM line and physical board location. For through-hole parts, a [resistor color-code calculator](https://www.flux.ai/p/tools/resistor-color-code-calculator) can help check the markings on the component. It does not replace the schematic or BOM value. ## How to Read Resistor Symbols in a Schematic Once you recognize a resistor symbol, follow the nodes to other components, as the position and connectivity reveal the function of the resistor. **LED current limiting.** If a resistor sits in series between a supply or output pin and an LED, it likely controls LED current. Its value must be chosen from the supply voltage, the LED’s forward voltage, and the desired current rather than the symbol’s appearance. **Pull-up resistor.** If one end connects to a signal and the other to the logic supply, the resistor may hold an undriven input HIGH. A similar connection to ground may be a pull-down. Check what else drives the signal and whether the supply voltage is safe for the input. Our [pull-up and pull-down guide](https://www.flux.ai/p/blog/understanding-pull-up-and-pull-down-resistors-a-guide-for-arduino-and-microcontrollers) shows both arrangements. **Voltage divider.** Two fixed resistors in series between a voltage source and ground can result in an intermediate voltage (marked VOUT below) at their junction: ![Schematic of a voltage divider: VIN connects through R1 and R2 in series to GND, and VOUT is taken from the junction between R1 and R2](https://www.flux.ai/p/assets/blogs/resistor-symbols/body-2.png) The symbol tells you there are two resistors and the junction tells you where to measure the divided voltage. Look at the values of both resistors and any load connected to `VOUT` before predicting the actual result. **Adjustable resistance.** A variable resistor or potentiometer may let a user tune a threshold, gain, or reference voltage. Check whether the circuit uses all three potentiometer terminals or only the wiper and one end. That distinction tells you whether the part is functioning as an adjustable divider or rheostat. **Temperature sensing.** A thermistor often appears in a divider whose midpoint feeds a microcontroller’s analog input. The changing resistance produces a changing voltage. To understand the reading, you need the thermistor’s NTC or PTC behavior and its resistance-versus-temperature data. These examples show why reading a [circuit diagram](https://www.flux.ai/p/blog/schematic-capture-explained) is about connections and labels as much as just understanding the symbols themselves. ## Using Resistor Symbols in Flux In Flux, start by searching the Parts Library for the resistor type you need and placing the component on the schematic canvas. Connect its pins to the other components by drawing nets between them. Flux’s [schematic editor guidance](https://docs.flux.ai/flux/faq/frequently-asked-questions--faq-) describes this basic placement-and-connection workflow. Set or confirm the resistance value and review the part’s other properties. For an early concept, a generic resistor can communicate the intended value. When the design approaches purchasing or PCB layout, choose a manufacturer part that meets the required tolerance, power rating, package, and availability constraints. For a thermistor, photoresistor, or potentiometer, also check that the selected schematic symbol and footprint represent the correct terminals. Keep designators and values close enough to their symbols to read without crowding the wires. Give related parts a logical arrangement. For example, keep both resistors in a divider near the node they create. A readable schematic makes it easier for someone else to spot a misplaced connection or incorrect value. Finally, [share the Flux project](https://docs.flux.ai/reference/reference-sharing-and-permissions) with a reviewer and ask them to check both the component choice and the circuit’s function. A clear resistor symbol is the starting point; the right value, connections, and physical part complete the design. ## FAQs ### What is the standard symbol for a resistor? Both the ANSI-style zigzag and IEC rectangle represent a fixed resistor. Which one you see depends on the drawing convention. ### Why are there two different resistor symbols? They come from different schematic conventions. Their shapes do not, by themselves, indicate different electrical properties. ### What is the symbol for a variable resistor? It is generally a resistor body with an arrow or adjustment mark. Check the terminals to see how the variable part is connected. ### What is the difference between a potentiometer and rheostat symbol? A potentiometer is a three-terminal component with a wiper. “Rheostat” usually describes using a variable resistor through two terminals. The schematic connections settle the distinction. ### What do R1 and R2 mean? They are unique reference designators for two resistor instances. Their values may be the same or different. ### How is a thermistor shown? It is shown as a resistor with a temperature-related marking. Consult the part details to determine whether it is NTC or PTC. ## About the author [Jharwin Barrozo](https://www.flux.ai/jharwinbarrozo) Electronics Engineer at Flux Jharwin is an electronics engineer mainly focused on satellites. He built his own ground station using Flux to monitor RF activities on the International Space Station. Find him on Flux [@jharwinbarrozo](https://flux.ai/jharwinbarrozo) Let’s start building Build your big idea together with Flux. All you need to do is describe what you want to make, or what problem you want to solve. 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systems](https://www.flux.ai/p/assets/blogs/buck-boost-converters/main.webp) ### Buck and Boost Converters: How They Work and Where They’re Used 3 Min Read](https://www.flux.ai/p/blog/explore-the-advantages-of-buck-and-boost-converter-in-modern-electronics)[ ![Typical schematic diagram of LM2596 buck converter or step-down converter with its various external components like capacitors, zener diode, and inductor](https://www.flux.ai/p/assets/blogs/lm2596/main.webp) ### LM2596 in Action: Case Study of Its Application in Power Supply Units 5 Min Read](https://www.flux.ai/p/blog/lm2596-in-action-case-study-of-its-application-in-power-supply-units)[ ![A complex printed circuit board highlighting the proper usage of ground fills/poor, stitching vias and power planes, without any components.](https://www.flux.ai/p/assets/blogs/gnd-fills-power-planes/main.webp) ### Guide to GND Fills and Power Planes 6 Min Read](https://www.flux.ai/p/blog/guide-to-gnd-fills-and-power-planes)[ ![Illustration for Power Distribution Network (PDN) Design in PCBs](https://www.flux.ai/p/assets/blogs/pdn-design-pcb/main.webp) ### Power Distribution Network (PDN) Design in PCBs 10 Min Read](https://www.flux.ai/p/blog/pdn-design-pcb)[ ![A detailed illustration of PCB grounding techniques showing ground planes, return paths, and noise reduction strategies](https://www.flux.ai/p/assets/blogs/pcb-grounding-techniques/main.webp) ### PCB Grounding Techniques for Noise Reduction and Stability 11 Min Read](https://www.flux.ai/p/blog/pcb-grounding-techniques)[ ![A detailed illustration of high-current PCB design showing trace sizing, thermal management, and power layout strategies](https://www.flux.ai/p/assets/blogs/high-current-pcb-design/main.webp) ### Designing High-Current PCBs: Layout and Safety Considerations 8 Min Read](https://www.flux.ai/p/blog/high-current-pcb-design)[ ![An illustration showing PCB trace resistance calculation concepts with copper traces and measurement tools](https://www.flux.ai/p/assets/blogs/how-to-calculate-pcb-trace-resistance/main.webp) ### How to Calculate PCB Trace Resistance 6 Min Read](https://www.flux.ai/p/blog/how-to-calculate-pcb-trace-resistance)[ ![A focused electrician wearing safety gear is carefully inspecting or repairing an electrical box with wires attached to it. He wears a yellow hard hat, safety glasses, ear protection, and gloves, highlighting the importance of personal protective equipment when working with electrical systems. The meticulous examination of the electrical connections signifies the critical nature of ensuring proper voltage levels and avoiding voltage drop, which can lead to reduced efficiency and potential damage to electrical components.](https://www.flux.ai/p/assets/blogs/voltage-drop/main.webp) ### Voltage Drop Calculations: Formulas, Factors, and Guidelines 5 Min Read](https://www.flux.ai/p/blog/importance-of-voltage-drop-calculations)[ ![An array of AC to DC converter circuit boards featuring components like transformers, bridge rectifiers, and capacitors to facilitate the conversion of alternating current to direct current.](https://www.flux.ai/p/assets/blogs/ac-to-dc-converters/main.webp) ### AC to DC Converter: The Backbone of Power Electronics 4 Min Read](https://www.flux.ai/p/blog/ac-to-dc-converter-the-backbone-of-power-electronics)[ ![AC-to-DC Converters: How They Work, Types, and Design Tips](https://www.flux.ai/p/assets/blogs/hatter/ac-dc-converter/main.webp) ### AC-to-DC Converters: How They Work, Types, and Design Tips 5 Min Read](https://www.flux.ai/p/blog/what-is-an-ac-to-dc-converter-technical-basics-explained)[ ![Illustration for Thermal Management in PCB Design: Methods and Best Practices](https://www.flux.ai/p/assets/blogs/pcb-thermal-management/main.webp) ### Thermal Management in PCB Design: Methods and Best Practices 10 Min Read](https://www.flux.ai/p/blog/pcb-thermal-management)[ ![PCB Thermal Management: Analysis and Design Best Practices](https://www.flux.ai/p/assets/blogs/pcb-thermal-analysis/main.webp) ### PCB Thermal Management: Analysis and Design Best Practices 6 Min Read](https://www.flux.ai/p/blog/achieving-efficient-heat-flow-pcb-thermal-management-best-practices)[ ![Illustration of a PPS chip symbolically powering three fast charging technologies—PPS, Power Delivery (PD), and Quick Charge (QC)—on a dark background.](https://www.flux.ai/p/assets/blogs/programmable-power-supply/main.webp) ### Understanding PPS Fast Charging: What It Is and How It Works 3 Min Read](https://www.flux.ai/p/blog/understanding-pps-fast-charging-what-it-is-and-how-it-works)[ ![Illustration for Decoupling Capacitors in PCB Design: Placement and Selection](https://www.flux.ai/p/assets/blogs/decoupling-capacitors-pcb/main.webp) ### Decoupling Capacitors in PCB Design: Placement and Selection 9 Min Read](https://www.flux.ai/p/blog/decoupling-capacitors-pcb)[ ![The image presents a graphical representation of Multilayer Ceramic Capacitors (MLCCs). On the left side of the image, there is a three-dimensional illustration of a capacitor, with a beige body and alternating white and golden layers, representing the ceramic and metal layers of the capacitor. An arrow points from this illustration to the right side of the image, where there is a cutaway view of a similar capacitor, showing multiple golden conducting layers separated by white ceramic layers, which illustrate the internal structure of the capacitor. The background is dark green, and above the illustrations, in large white and green text, the acronym "MLCCs" is spelled out, followed by the full term "MULTILAYER CERAMIC CAPACITORS" in smaller capital letters.](https://www.flux.ai/p/assets/blogs/multilayer-ceramic-capacitors/main.webp) ### What Is a Multilayer Ceramic Capacitor (MLCC)? 5 Min Read](https://www.flux.ai/p/blog/what-is-a-multilayer-ceramic-capacitor-key-features-and-applications)[ ![Cutaway diagram of a tantalum capacitor showing anode, dielectric, cathode layers, epoxy case, and leads](https://www.flux.ai/p/assets/blogs/tantalum-capacitor/main.webp) ### Tantalum Capacitors Guide: Polarity, Derating & Risks 7 Min Read](https://www.flux.ai/p/blog/tantalum-capacitor)[ ![A big text Amps vs Volts with their corresponding symbols (I and V) as background](https://www.flux.ai/p/assets/blogs/amps-vs-volts/main.webp) ### Amps vs. Volts: Key Differences and How They Work Together 4 Min Read](https://www.flux.ai/p/blog/amps-vs-volts-understanding-the-key-differences)[ ![Shunt resistor, Hall-effect, and current transformer current sensors compared.](https://www.flux.ai/p/assets/blogs/current-sensor-types/main.webp) ### Current Sensor Types: Shunt, Hall Effect, and Current Transformer Comparison 12 Min Read](https://www.flux.ai/p/blog/current-sensor-types)[ ![Never Worry About Stackups Again: Introducing the Stackup Editor](https://www.flux.ai/p/assets/blogs/stackup_editor/main.webp) ### Never Worry About Stackups Again: Introducing the Stackup Editor 3 Min Read](https://www.flux.ai/p/blog/never-worry-about-stackups-again-introducing-the-stackup-editor)[ ![Flux Stackup Editor showing a Standard 4-Layer PCB stackup with Top Copper, Mid-Layer 1, Mid-Layer 2, and Bottom Copper signal layers separated by Prepreg and Core dielectric materials, with layer thicknesses and dielectric constants configured for impedance-controlled PCB design.](https://www.flux.ai/p/assets/blogs/multilayer-pcb-design/main.webp) ### Multilayer PCB Design: Best Practices for Circuit Board Layout 8 Min Read](https://www.flux.ai/p/blog/multilayer-pcb-design-best-practices)[ ![An illustrated guide to PCB materials comparing FR4 and advanced substrates for high-performance circuit board design](https://www.flux.ai/p/assets/blogs/pcb-materials-guide/main.webp) ### How to Choose PCB Materials: FR4 vs Advanced Substrates 7 Min Read](https://www.flux.ai/p/blog/pcb-materials-guide)[ ![A detailed illustration showing the cross-section of a multilayer PCB with different via types including through-hole, blind, buried, and microvias](https://www.flux.ai/p/assets/blogs/pcb-via-types-guide/main.webp) ### Blind Vias, Buried Vias, and Microvias: A Complete Guide to PCB Via Types 12 Min Read](https://www.flux.ai/p/blog/pcb-via-types-guide)[ ![A 2d view and layout of a pcb board design showing different type of vias](https://www.flux.ai/p/assets/blogs/different-type-vias/main.webp) ### Exploring Different Types of Vias in PCB 2 Min Read](https://www.flux.ai/p/blog/exploring-different-types-of-pcb-vias)[ ![A complex PCB board with high-density interconnect (HDI) technology, featuring advanced routing on each of its copper layers.](https://www.flux.ai/p/assets/blogs/smart-micro-vias-blind-buried-vias/main.webp) ### High-Density PCBs just got easier with Smart Vias 4 Min Read](https://www.flux.ai/p/blog/high-density-pcbs-just-got-easier-with-smart-vias)[ ![A detailed illustration of a multilayer PCB cross-section showing via stitching connecting ground planes across layers](https://www.flux.ai/p/assets/blogs/via-stitching-pcb-guide/main.webp) ### How to Use Via Stitching in PCB Design 11 Min Read](https://www.flux.ai/p/blog/via-stitching-pcb-guide)[ ![An illustration of PCB design constraints showing electrical, mechanical, and manufacturing rules](https://www.flux.ai/p/assets/blogs/pcb-design-constraints/main.webp) ### PCB Design Constraints: What Engineers Need to Know 7 Min Read](https://www.flux.ai/p/blog/pcb-design-constraints)[ ![PCB constraint management showing how engineers control layout rules for routing, spacing, and impedance](https://www.flux.ai/p/assets/blogs/pcb-constraint-management/main.webp) ### PCB Constraint Management: How Engineers Control Layout Rules 6 Min Read](https://www.flux.ai/p/blog/pcb-constraint-management)[ ![Design Rule Checking (DRC) in PCB Design: Real-Time vs Batch, Rules, and Common Failures](https://www.flux.ai/p/assets/blogs/pcb-drc/main.webp) ### Design Rule Checking (DRC) in PCB Design: Real-Time vs Batch, Rules, and Common Failures 8 Min Read](https://www.flux.ai/p/blog/pcb-design-rule-checking-drc)[ ![ERC vs DRC in PCB design showing the difference between electrical rule checks and design rule checks](https://www.flux.ai/p/assets/blogs/erc-vs-drc/main.webp) ### Electrical Rule Check (ERC) vs DRC in PCB Design 7 Min Read](https://www.flux.ai/p/blog/erc-vs-drc)[ ![A guide to PCB design reviews covering schematic, layout, and DFM checks for catching errors early](https://www.flux.ai/p/assets/blogs/pcb-design-review-process/main.webp) ### PCB Design Reviews: Best Practices for Catching Errors Early 6 Min Read](https://www.flux.ai/p/blog/pcb-design-review-process)[ ![Common PCB Design Mistakes and How to Avoid Them](https://www.flux.ai/p/assets/blogs/pcb-design-mistakes/main.webp) ### Common PCB Design Mistakes and How to Avoid Them 31 Min Read](https://www.flux.ai/p/blog/pcb-design-mistakes)[ ![Image showing a stack of printed circuit boards (PCBs) with a large white 'X' over them, highlighting '5 Common Mistakes in PCB Design.' The background features intricate PCB traces in red and blue on a dark surface, with a purple gradient highlighting the title. The image emphasizes errors commonly made in PCB design, such as layout, signal integrity, and component placement.](https://www.flux.ai/p/assets/blogs/5-common-mistakes-in-pcb-design/main.webp) ### 5 Common PCB Design Mistakes and How to Avoid Them 7 Min Read](https://www.flux.ai/p/blog/5-pcb-design-mistakes-that-could-ruin-your-board)[ ![A guide to PCB silkscreen design covering labeling, readability, and common manufacturing mistakes](https://www.flux.ai/p/assets/blogs/pcb-silkscreen-design/main.webp) ### PCB Silkscreen Design: Guidelines and Common Mistakes 7 Min Read](https://www.flux.ai/p/blog/pcb-silkscreen-design)[ ![Advanced complex PCB boards using Flux's Smart Polygons](https://www.flux.ai/p/assets/blogs/smart-polygons/main.webp) ### Smart Polygons: Advanced PCB Design Just Got Easier 4 Min Read](https://www.flux.ai/p/blog/smart-polygons-advanced-pcb-design-just-got-easier)[ ![A complex printed circuit board with lots of electronic components. A 3D render of the PCB on Flux.](https://www.flux.ai/p/assets/blogs/new-3d-render/main.webp) ### Automatically Create Photorealistic PCB Renders 3 Min Read](https://www.flux.ai/p/blog/automatically-create-photorealistic-pcb-renders)[ ![A tool on Flux to measure the distance between two pads in PCB editor with a text mm to mil conversion.](https://www.flux.ai/p/assets/blogs/mm-to-mil/main.webp) ### How to Convert from MM to Mils: a Guide for Beginners 4 Min Read](https://www.flux.ai/p/blog/how-to-convert-from-mm-to-mils-a-guide-for-beginners)[ ![Illustration of a printed circuit board showing solder mask over copper traces and exposed pads.](https://www.flux.ai/p/assets/blogs/what-is-solder-mask/main.webp) ### What Is Solder Mask? Materials, Colors, and PCB Design Rules 6 Min Read](https://www.flux.ai/p/blog/what-is-solder-mask)[ ![Designing Custom PCB Outlines: Fixing DXF and SVG Import Failures](https://www.flux.ai/p/assets/blogs/import-dxf-board-outline-error/main.webp) ### Designing Custom PCB Outlines: Fixing DXF and SVG Import Failures 6 Min Read](https://www.flux.ai/p/blog/import-dxf-board-outline-error)[ ![PCB Enclosure Design: How to Design an Enclosure](https://www.flux.ai/p/assets/blogs/pcb-enclosure-design/main.webp) ### PCB Enclosure Design: How to Design an Enclosure 13 Min Read](https://www.flux.ai/p/blog/pcb-enclosure-design)[ ![A PCB layout with IPC design standards that apply to trace width, land patterns, and assembly.](https://www.flux.ai/p/assets/blogs/pcb-ipc-standards/main.webp) ### PCB IPC Standards Explained: IPC-2221, IPC-2152, IPC-7351, and More 9 Min Read](https://www.flux.ai/p/blog/pcb-ipc-standards)[ ![A guide to PCB component selection covering electrical specs, footprints, thermal performance, and sourcing best practices](https://www.flux.ai/p/assets/blogs/component-selection-pcb-design/main.webp) ### Component Selection in PCB Design: How Engineers Choose the Right Parts 7 Min Read](https://www.flux.ai/p/blog/component-selection-pcb-design)[ ![Flux Copilot’s new AI-powered part search makes finding and placing components faster and easier using natural language.](https://www.flux.ai/p/assets/blogs/smarter-part-search/main.webp) ### Smarter Part Search Just Got a Major Upgrade 6 Min Read](https://www.flux.ai/p/blog/smarter-part-search-just-got-a-major-upgrade)[ ![A detailed illustration showing PCB footprint design with pad layout, silkscreen markings, and courtyard boundaries](https://www.flux.ai/p/assets/blogs/pcb-footprint-design-guide/main.webp) ### How to Design a PCB Footprint (Step-by-Step Guide) 8 Min Read](https://www.flux.ai/p/blog/pcb-footprint-design-guide)[ ![A close-up xray of printed circuit board with its multi-layer traces featuring short circuit and over current protection.](https://www.flux.ai/p/assets/blogs/protection-circuit-101/main.webp) ### Protection Circuit 101: Securing Your Electronics from Overcurrent and Short Circuits 5 Min Read](https://www.flux.ai/p/blog/protection-circuit-101-securing-your-electronics-from-overcurrent-and-short-circuits)[ ![Diagram of a simple circuit with an inductor and a flyback diode. The resistor represents the resistance of the inductor's windings.](https://www.flux.ai/p/assets/blogs/flyback-diodes/main.webp) ### Understanding the Flyback Diode: Your Essential Guide to Functionality and Why You Need One 3 Min Read](https://www.flux.ai/p/blog/understanding-the-flyback-diode-your-essential-guide-to-functionality-and-why-you-need-one)[ ![3D render of a zener diode with its electronic symbol and pinout which consists of anode and cathode](https://www.flux.ai/p/assets/blogs/what-is-zener-diode/main.webp) ### What Is a Zener Diode? How It Works and Where It’s Used 5 Min Read](https://www.flux.ai/p/blog/what-is-a-zener-diode-an-essential-breakdown)[ ![A cross-section through an nMOSFET when the gate voltage VGS is below the threshold for making a conductive channel; there is little or no conduction between the terminals drain and source; the switch is off. When the gate is more positive, it attracts electrons, inducing an n-type conductive channel in the substrate below the oxide (yellow), which allows electrons to flow between the n-doped terminals; the switch is on.](https://www.flux.ai/p/assets/blogs/mosfet-basics/main.webp) ### Understanding the Fundamentals: MOSFET Basics for Beginners 6 Min Read](https://www.flux.ai/p/blog/understanding-the-fundamentals-mosfet-basics-for-beginners)[ ![Typical schematic diagram of LM741, a classic operational amplifier](https://www.flux.ai/p/assets/blogs/lm741/main.webp) ### LM741 Pinout: A Deep Dive into a Classic Op Amp 4 Min Read](https://www.flux.ai/p/blog/lm741-pinout-a-deep-dive-into-a-classic-op-amp)[ ![An assortment of variable resistors displayed on a dark background with the text 'Variable Resistors' at the top and a circuit symbol for a variable resistor in the center](https://www.flux.ai/p/assets/blogs/6-types-of-variable-resistors/main.webp) ### 6 Types of Variable Resistors: a Detailed Look at Their Uses 6 Min Read](https://www.flux.ai/p/blog/6-types-of-variable-resistors-a-detailed-look-at-their-uses)[ ### Parallel and Series Resistor Calculator 3 Min Read](https://www.flux.ai/p/blog/parallel-and-series-resistor-calculator)[ ![A resistor showing its different color bands](https://www.flux.ai/p/assets/site-cms/643f890cd71a69ee18b71efa_resistor-color-code-calculator.png) ### Resistor Color Code Calculator 4 Min Read](https://www.flux.ai/p/blog/resistor-color-code-calculator)[ ![A comparison illustration of SMT and through-hole PCB assembly technologies](https://www.flux.ai/p/assets/blogs/smt-vs-through-hole/main.webp) ### SMT vs Through-Hole Technology: Which Should You Use? 8 Min Read](https://www.flux.ai/p/blog/smt-vs-through-hole)[ ![A person soldering a circuit board made with Flux](https://www.flux.ai/p/assets/blogs/flux-soldering/main.webp) ### How to Use Flux When Soldering Electronics 12 Min Read](https://www.flux.ai/p/blog/solder-flux-guide-for-soldering)[ ![Different types of toggle switches scattered and a big text - Toggle switch](https://www.flux.ai/p/assets/blogs/toggle-switch/main.webp) ### The Ultimate Guide to Toggle Switches: Types, Uses, and How They Work 3 Min Read](https://www.flux.ai/p/blog/the-ultimate-guide-to-toggle-switches-types-uses-and-how-they-work)[ ![A push button switch soldered on a rigid-flex printed circuit board](https://www.flux.ai/p/assets/blogs/push-button/main.webp) ### What Is the Science Behind Push Button Switches and How They Work 6 Min Read](https://www.flux.ai/p/blog/what-is-the-science-behind-push-button-switches-and-how-they-work)[ ![Tactile Switches: Wiring, Debouncing, and PCB Design](https://www.flux.ai/p/assets/blogs/tactile-switches-guide/main.webp) ### Tactile Switches: Wiring, Debouncing, and PCB Design 8 Min Read](https://www.flux.ai/p/blog/tactile-switches-guide)[ ![Close up of different types of electrical connectors, wire connectors, and solder connectors piled up.](https://www.flux.ai/p/assets/blogs/electrical-connectors/main.webp) ### Electrical Wire Connector Types and Uses 4 Min Read](https://www.flux.ai/p/blog/the-ultimate-guide-to-electrical-connectors-and-wiring-connection)[ ![An illustration of PCB debugging tools and techniques including multimeter, oscilloscope, and thermal imaging](https://www.flux.ai/p/assets/blogs/pcb-debugging-common-issues/main.webp) ### Why Your PCB Is Failing: Debugging Common Issues 7 Min Read](https://www.flux.ai/p/blog/pcb-debugging-common-issues)[ ![555 Timer Guide: Pinout, Operating Modes, and Circuit Examples](https://www.flux.ai/p/assets/blogs/555-timer/main.webp) ### 555 Timer Guide: Pinout, Operating Modes, and Circuit Examples 10 Min Read](https://www.flux.ai/p/blog/555-timer)[ ![Inverting Op-Amp Circuits: Formula, Gain, and Design Examples](https://www.flux.ai/p/assets/blogs/inverting-op-amp/main.webp) ### Inverting Op-Amp Circuits: Formula, Gain, and Design Examples 10 Min Read](https://www.flux.ai/p/blog/inverting-op-amp)[ ![How to Wire a Potentiometer: Pinout, Diagrams, and PCB Examples](https://www.flux.ai/p/assets/blogs/how-to-wire-a-potentiometer/main.webp) ### How to Wire a Potentiometer: Pinout, Diagrams, and PCB Examples 8 Min Read](https://www.flux.ai/p/blog/how-to-wire-a-potentiometer) See All (113) ## Let’s start building. Let’s build your idea together. All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. [Try it Free](https://www.flux.ai/signup) ![Close-up of a Flux-designed printed circuit board](https://www.flux.ai/p/assets/homepage-v2/mission-visual.webp)