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A subreddit for practical electronic engineering questions: Circuit and component theory, component-level circuit design & repair, buying components, test gear and tools.

Commercial stuff (selling, paid work etc.) - see /r/ElectronicsList/

---- Click HERE for our FAQ/Wiki ----


We don't cover:

Electrical installation work and parts, home lighting (inc. LEDs), appliance repairs & advice.

Buying and general tech. advice for 'electronic' goods (audio, TV, computers, phones, battery chargers, domestic appliances etc.) - use: /r/appliancerepair, /r/electrical, /r/electricians, /r/askanelectrician, /r/techsupport etc.

Career or certification advice - please post in /r/ece

Not sure if your question is on topic? Ask the mods before posting.

Off topic questions, and those fully answered in the Wiki, may be removed.

TV Repair / replacing electrolytic capacitors

Try /r/tvrepair first. Please READ THIS too - especially before posting that parts 'look OK'.

WARNING: follow advice at your own risk. High voltages are potentially dangerous. If in doubt seek an expert.


  1. Read the sidebar and our Wiki/FAQ BEFORE posting!

  2. On topic questions only - see Rule #1.

  3. The post title should summarize the question clearly & concisely.

  4. Extra rules apply to questions on vehicle electronics - please read before posting.

  5. Add a flair/category tag to your posts (see "Tags" section below).

  6. "Jokey" comments that don't materially contribute to the topic may be deleted. (This isn't /r/ShittyAskElectronics).

  7. "Report" link rules.

Typical questions

"Trying to locate a replacement for a blown MOSFET"

"Why doesn't my Op-Amp circuit work as expected?"

"How do I calculate the bandwidth of an amplifier?"

"How can I take high voltage measurements with my oscilloscope?"

Many common questions are answered in the FAQ so do check it out:

---- Click HERE for our FAQ/Wiki ----

Tags / Flairs

You must categorize your question by clicking the "add tag" (flair) button after posting it. Please check all tag descriptions before choosing one.

Click a tag name below to view just the posts in that category



SPICE, CAD, EDA software etc.


Physically implementing a design (e.g. PCBs, connectors).


Help with circuit design: Component use & values, implementing reference designs, how-tos etc. Please also read the last paragraph of the Embedded tag.


Working with HARDWARE on single board computers, microprocessors, microcontrollers, CPLDs and FPGAs: Electronic circuit design & debug, power rails, clocks, interrupts, logic analysis and signal timing/protocol issues with buses such as: data, address, I2C, SPI, CAN, I2S, JTAG, SMBUS, ICSP etc.

We don't cover general programming or IDE use/choice

If you are working with boards like Arduino, Teensy, Raspberry Pi, ESP8266/32 variants, STM, Beaglebone, TI, Intel etc., and want coding advice or hookup help (power, sensors, displays etc.), first try the device-specific subs - there's a list here:


Questions about the equipment used for electronic circuit design, repair and troubleshooting (multimeters, 'scopes, logic analysers & probes etc.). Questions on use, specifications, buyng spares and maintenance. No generic 'which is best' and 'where to buy'-type questions please.


Related to this subreddit.


Modifying an electronic circuit or product at component level. Not for general 'modding my PC' etc.


First, check out our list of national and global suppliers. Use this tag if you need help sourcing electronic components or parts related to a circuit build or repair.

Please tell us roughly where you live - especially if you are looking for a local supplier!

Also for advice on electronic component specs (pinout, equivalents, timing, signal levels etc.).


For component-level design and repair questions on electronic power supplies, power supply circuits and constant voltage / constant current circuits.

DO NOT USE THIS TAG FOR POWER SUPPLY PURCHASING QUESTIONS, nor for answers to generic 'how do I raise/lower voltages'-type questions - SEE THE WIKI first.

Solar electricity (PV): We cover designing or repairing solar-related electronic circuits (control and management systems). For general battery/module/panel-level questions (hookup, specifications, capacity, buying etc.) please use /r/SolarDIY.

LED strips: READ THIS before posting here.

Electrical wiring (home, industrial): /r/electricians or /r/askanelectrician.

Project Idea

Scoping out an idea based on electronic components.

*If you're hooking up pre-built stuff (eg: Connecting I/O or power modules to Arduino, Raspberry Pi, ESP8266 etc.), see the list of subs here *


Fixing a commercial product. Note the dedicated subreddits below (eg: /r/tvrepair).

For domestic electrical stuff, try: /r/appliancerepair, /r/electrical or /r/electricians.


General electronics theory eg: equations, semiconductor theory, component/materials behavior, Ohms and other laws etc.


Hand tools, soldering and build/rework tools etc. Usage and specs.



Something not working?!

DID YOU DESIGN IT YOURSELF or are you following someone else's design and need help: OK, go right ahead; you ARE 'troubleshooting'!

IS IT A COMMERCIAL PRODUCT (TV, radio, oscilloscope etc.): You want the 'Repair' tag.

Is it a modular system such as: Arduino, Raspberry Pi, Teensy, Beaglebone, ESP8266 etc. and you need help hooking up power, I/O modules, sensors, motors, LED strips etc.: FIRST try one of the board-specific subs; there's a list on our Embedded wiki page.

What is this

Identifying an electronic component in an electronic assembly. For a device you found in a dumpster, or that you want to know how much you should sell for on eBay, please ask in /r/WhatIsThisThing.

You can also add a flair tag for your username with your area of expertise by clicking on the "edit" button at the top.

Related subreddits

Some other subreddits focus on specific electronics/electrical-related topics and may be a better first place for your question:

Electronics Design - specialist subreddits

  • Audio construction: /r/diysound (active moderation) and/or /r/diyaudio (no moderation)

  • Electronic musical instruments design and repair: /r/SynthDIY, r/MusicElectronics/, /r/diypedals/

  • PCB design: /r/PrintedCircuitBoard

  • Radio, rf, antenna design/theory questions and software-defined radio: /r/rfelectronics, /r/AmateurRadio, /r/GNURadio, /r/RTLSDR

  • Signal processing: /r/DSP

  • Starting Electronics: /r/StartingElectronics


  • Battery tech: /r/batteries

  • Broader ECE (Electrical and Computer Eng.): /r/ece

  • Commercial (buying, selling, consulting jobs): /r/ElectronicsList

  • General electrical eng.: /r/AskEngineers, /r/ElectricalEngineering/

Consumer stuff

  • Hifi hookup and buying advice: /r/BudgetAudiophile/

  • Car/Vehicle: Lighting, audio, wiring, fixing etc. : /r/CarAV,/r/CarModification, /r/Cartalk,

  • Computers: /r/TechSupport. Design and build: /r/buildapc

  • Computer network, cabling /r/CableAdvice

  • Consumer electronics /r/TechSupport

  • Home audio repairs especially for vintage gear: /r/audiorepair

  • Household electrical wiring, connectors and fittings: /r/electricians and /r/led (for room lighting).

  • Mobile/cellphones: /r/mobilerepair/

  • Solar Ask here if designing or repairing your own electronic control circuits. For general setup questions, 'how tos', specifications and what-connects-to-what etc., please use /r/solar.

  • TV repair questions: /r/TVRepair

  • Vaping: Construction, mods and powering: /r/modifiedvapes/ and /r/OpenPV/

  • Find a subreddit: for anything else

Other related subreddits

  • /r/AppNotes
  • /r/eebooks+csbooks+mathbooks
  • /r/Electronics
  • /r/Engineering
  • /r/Embedded
  • /r/Batteries

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