Check out the Best Porn Sites for an ad-free browsing experience!


27,938 subscribers a community for 6 years, 1 month

last post today [+]

A subreddit for technical questions on the theory, design and repair of electronic circuits.

Click HERE for our FAQ/Wiki

We'd love your questions on repairing, designing and troubleshooting electronic circuits and related topics such as: components, tools and equipment (purchase and use).

Some electronics-related topics have dedicated subreddits - see below.

Please don't ask questions on electrical installation or modification work of any kind here (home, industrial or vehicle), nor any form of electrical or electronic work to modify or add a home-made 'enhancement' to a vehicle (see FAQ for an explanation). Check below for guidance on where to post those types of questions.

If you have a general technical, setup or purchasing question on any electrical or electronic product (except for items covered by the 'Equipment' tag), please use /r/techsupport, /r/electricians or a subreddit related to the product (audio, TVs, domestic appliances etc.) - there's some suggestions below.

Out of scope questions may be removed, and for ones that are fully answered in the Wiki, we'll point you to it and remove the post. Please read the Wiki/FAQ before submitting a question.

TV Repair / replacing electrolytic capacitors

Consider posting in /r/tvrepair first. In any event, please READ THIS first - especially before posting that the capacitors 'look OK'.

WARNING: follow advice at your own risk. When dealing with high voltage or other potentially dangerous situations, seek an expert.


  1. Stick to questions on the theory, design and repair of electronic circuits. Examples below.

  2. Read the sidebar and our wiki/FAQ before posting!

  3. Summarize questions clearly & concisely in the post title.

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

  5. "Jokey" comments that don't materially contribute to the discussion are eligible for instant deletion. (This isn't /r/ShittyAskElectronics.)

  6. "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).


Making something specific (e.g. picking component values).


Working with HARDWARE on single board computers, microprocessors, microcontrollers, CPLDs and FPGAs. Questions on 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.

Please note this is an electronics-oriented subreddit so do not post questions on general programming or IDE use/choice ('how do I calculate the timing of a delay loop?', 'what's wrong with my LED blink code?', 'Is PlatformIO better than Visual Studio?' etc.)

If you are working with whole-board units or development boards (Arduino, Teensy, Raspberry Pi, ESP8266 variants, STM, TI, Intel etc) and just want programming advice or help with how to hook them up to other pre-built modules (power, sensors, displays etc.), please first try the device-specific subs - eg: /r/arduino, /r/avr, /r/raspberry_pi/, /r/pic_programming, /r/esp8266, /r/FPGA, /r/microcontrollers/ etc.


For test and measurement equipment as used for electronic circuit design and repair / troubleshooting (multimeters, 'scopes, logic analysers & probes etc.). Questions on use, meeting particular specifications, sourcing 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 the component level.


First, check out the comprehensive list of regional and global suppliers. Use this tag if you need further 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.).


This tag is exclusively for component-level design and repair questions on power supplies, or the power regulation circuits in your projects: Linear or switch mode, buck/boost, smoothing, constant current etc. 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 FAQ for those.

Solar electricity (PV): Ask here for help with 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/solar.

For questions on electrical wiring (home, industrial, vehicles), or 220/110V voltage conversion use /r/electricians or /r/techsupport.

Project Idea

Have an idea for something and want to know if you're heading in the right direction.

If you are just looking for advice on hooking up prebuilt stuff (eg: Connecting I/O or power modules to Arduino, Raspberry Pi, ESP8266 etc.), try one of the board-specific subs - see the 'Embedded' tag.


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


General electronics theory not related to a specific design eg: equations, semiconductor theory, component/materials behavior, Ohms and other laws etc.

Not for questions like "Does anyone have a theory why my bluetooth speaker is not charging?"


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


Getting project circuit designs or other non-commercial products working (use 'Repair' for fixing commercial stuff).

If you are just working with pre-built assemblies (eg: Connecting I/O or power modules, sensors, motors etc. to Arduino, Raspberry Pi, ESP8266 etc.), try one of the board-specific subs; see the list under the Embedded tag description.

What is this

Identifying something electronic (parts and boards).

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

Electronics Design - specialist subreddits

  • Constructing your own audio gear - /r/diysound (active moderation) and/or /r/diyaudio (no moderation)

  • PCB design - /r/PrintedCircuitBoard

  • Signal processing - /r/DSP


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

  • General electrical engineering: /r/AskEngineers

  • Basic math or physics: /r/math or /r/askscience.

Consumer Electronics, audio/visual, computing etc.

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

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

  • Computer problems; see /r/TechSupport. Design and build: /r/buildapc

  • Computer network, cabling /r/CableAdvice

  • Consumer electronics setup and use: /r/TechSupport

  • Home audio repairs especially for vintage amps and receivers: /r/audiorepair

  • Household electrical wiring, connectors and fittings: /r/electricians

  • Solar Ask away here if you are designing or repairing your own electronic control circuits. For general questions on batteries, management systems, panel specs, 'how to', specifications and what-connects-to-what questions etc., please use/r/solar.

  • TV repair questions: /r/TVRepair

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

  • Starting Electronics: see /r/StartingElectronics

Recommended subreddits

  • /r/AmateurRadio

  • /r/AppNotes

  • /r/Audiorepair

  • /r/DSP

  • /r/ECE

  • /r/eebooks+csbooks+mathbooks

  • /r/Electricians

  • /r/Electronics

  • /r/Engineering

  • /r/GNURadio

  • /r/PrintedCircuitBoard

  • /r/RFelectronics

  • /r/RTLSDR

no tags added yet, be the first

keeping track of 1,027,067 reddits