/r/electronics
Discussion and news about component-level electronic circuits.
A subreddit dedicated to news, articles and general discussions related to the field of electronic engineering.
Rules
Be civil: Do not insult fellow Redditors. Do not yell. As this is a professional sub, act and speak professionally.
The focal point of a submission must be component-level electronic engineering, design, news, and circuits (with at least one active element: a semiconductor or a vacuum tube/valve). See below for off-topic subjects.
No commercial or promotional posts: advertising, endorsing or praising a company, fundraising and crowdfunding, giveaways, sponsored products and services, selling, offers, product announcements and information, blogs, videos, pictures of / links to commercial boards. Applicable even if free or if submitter does not benefit monetarily. This sub abides strictly to Reddit's Rules of Self-promotion. [Post offers related to electronic engineering in /r/ElectronicsList]
Add a flair your submission.
- 'Project' must link to full (non-commercial) build instructions. Otherwise, use 'Gallery'.
- 'Tip" is for tricks and suggestions useful to the electronics designer
Off topic
- 2a) Ready-made electronic assemblies (e.g., a Single-Board-Computer - Arduino. PI -, a relay module, a computer mouse); projects that are based entirely on such ready-made electronics assemblies (e.g., a green-house watering system that uses an Arduino and no other electronic components)
- 2b) Plain electrical components and circuits (no active components), such as transformers, relays, resistors, light bulbs, cables, batteries, connectors, sensors)
- 2c) Consumer products (marketed as "electronics") or self-made products, even if historically significant. Do not post an enclosed assembly just because it contains 'electronics' internally
- 2d) Questions [Ask questions about electronic circuits and components in /r/AskElectronics]
- 2e) Memes (pictures w/text), low effort ("shit-posts"), as decided by the mods. [If about electronic circuits and components, post in /r/ElectronicsHumor]
- 2f) Labs and test equipment [If electronics, post them here on a Wednesday. No submissions that may be considered to be focusing on equipment brands rather than technical merit. One submission a week max.]
---- Click HERE for our Wiki ----
Tags / Flairs
Please categorize your post by clicking the "add tag" (flair) button after submitting it.
Click a tag name below to view just the posts in that category
CLICK HERE TO RESET TAG FILTER
General pictures or videos related to component-level electronic engineering (See posting Rule #1).
Videos with commercial content or sponsorship/patronage requests are likely to be removed; repeat offenders may be banned from the sub. If in doubt, contact the mods before posting.
Electronic engineering-related posts that don't fall into any other category.
An electronic engineering-related news article or announcement.
Show us your (or someone else's) electronic circuit design and/or final build.
If you are just posting pictures or videos with no further write-up, please use the 'Gallery' tag.
Videos with commercial content or sponsorship/patronage requests are likely to be removed; repeat offenders may be banned from the sub. If in doubt, contact the mods before posting.
To qualify as a project, the details available should allow someone else to make a copy.
NB: This is for original work - pictures of stock kit builds will be deleted.
A useful or insightful technical note on component selection, circuit design or testing etc. - something beyond 'stick decoupling caps everywhere'!
Related subreddits
- Ask Electronics
- Electrical and Computer Engineering
- Digital Electronics
- Logisim digital circuit simulator
- FPGAs
- DSP
- PLC - Programmable Logic Controllers
- PrintedCircuitBoard
- RF Electronics
- Electronic Circuits
- ECE Component Exchange
- Nice Chips
- AppNotes
- The AmpHour
- Hardware Startups
- Engineering
- Amateur Radio
- Car Hacking
- DIY Tubes
Electronic circuit design and repair questions go in /r/AskElectronics •
View and contribute to our wiki page for beginners
Banner from original picture by Sergej Klammer (/u/zappadoing). Used with permission. Licence: CC-BY-SA*
↓ (please edit!)
/r/electronics
1,237,168 Subscribers
1975: Hagelin CRM-008 Two-dimensional voice scrambler
19:53 UTC
Modifying generic automatic cat feeders to much simpler web interface using ESP8266!
I got so fed up with the stupid interface on the front of my automatic cat feeders that I decided to make a web interface and use the ESP8266 to control them. They are very simple devices. Across two different brands of feeders I have they use the same internal mechanism, so this should work pretty universally across all generic-looking cat feeders...
I was going to design a custom PCB but the circuit is so simple it was pointless and would've taken weeks to arrive. I cut the original wiring harness and crimped on JST-XH connectors to make it look somewhat professional.
cat feeder from brand #1 wired to my board
cat feeder from brand #2 wired to my board
The prefboard I made (I made 3x of them)
You can check out the code and some more images of the feeders and board (front/back/etc) here:
17:40 UTC
My latest Project: an RP2040 board called Nova
Hey everyone! I’m excited to share my latest project: a tiny, open-source RP2040-based board with an integrated addressable LED matrix. It’s built on a 4-layer PCB, and the LEDs are ultra-small (just 1mm x 1mm each), using WS2812 for full addressability.
16:29 UTC
Possible future import tariffs on PCBs / electronic components / test equipment coming into USA
23:42 UTC
My first inverter!
I started tinkering with transistors because it’s what I am mostly learning this semester. First I tried to control output using the PWM pin from my RPi. After that I got the idea of building an RC car and doing the input to the motor from scratch. My first working test is an H-bridge using 4 npn and 2 pnp transistors with modulation through the Q2 and Q4 npn.
Right now I can generate a rectangular wave. The 2 LEDs are in opposite directions, so a positive voltage turns one and a negative the other. The This week I want to bring it to uni and test the sinusoidal generation and efficiency with the oscilloscope.
18:36 UTC
Weekly discussion, complaint, and rant thread
Open to anything, including discussions, complaints, and rants.
Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.
Reddit-wide rules do apply.
To see the newest posts, sort the comments by "new" (instead of "best" or "top").
16:00 UTC
Warning: Many cheap clip leads coming out of China are made of iron wire.
17:30 UTC
My first own designed PCB a Led Chaser with a 2x 555 + 74hc595 for Halloween prop. I Converted a old alarm system to this.
22:37 UTC
My first 8-bit CPU on FPGA: FliPGA01 (details in comments)
19:51 UTC
My first RLC circuit as a end of semester project (circuits 1)
Just wanted to share my first dc circuit, it is for my first circuits class, as a end of semester project.
It consist in just a relay, a 1000uf capacitor and a 330 ohm resistor.
It still is not the proper or final circuit, as I'm using a 5v relay with 12v as power source. Also it is conected in the "inverse way" as the leds need to imitate signal lights from a car.
Tomorrow I will buy the correct parts but for the moment I'm happy to see that this works and I can do the math to understand it !
03:54 UTC
Inductor i wound for an FM radio circuit
18:35 UTC
22 years ago - to the day. I was 12 and had made my first audio amplifier!
00:04 UTC
Just created my first ever video. It explains the concept of RC circuits in a more entertaining way, and I hope many will find it useful!
01:48 UTC
Weekly discussion, complaint, and rant thread
Open to anything, including discussions, complaints, and rants.
Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.
Reddit-wide rules do apply.
To see the newest posts, sort the comments by "new" (instead of "best" or "top").
15:00 UTC
i have disigned my first pcb!
17:43 UTC
The search for "well enough" (not perfection)
I have mad respect for anyone who nails a well-designed PCB on the first go. Meanwhile, I'm embracing the 'iterative approach'—which is a fancy way of saying I make a lot of prototypes and have a constant love-hate relationship with my own designs.
Take, for instance, my simple mix-mode display side project. All I wanted was a nice combo of a 7-segment displays, LEDs, and a bargraph, controlled by a MAX7221 for some other projects. Easy, right? Well, fast forward two years, and I've got a beautiful timeline of my trials, errors, and the occasional "Aha!" moments. Honestly, it's been a journey. My first design was basically a cry for help, but now it's evolved to the point where I am okay with it. But hey, it works now for my main projects.
11:52 UTC
Brother
08:09 UTC
Repair of Belkin Wireless Charger using Freezing Technique
16:39 UTC
Weekly discussion, complaint, and rant thread
Open to anything, including discussions, complaints, and rants.
Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.
Reddit-wide rules do apply.
To see the newest posts, sort the comments by "new" (instead of "best" or "top").
15:00 UTC
Irish normally closed switch
In ireland we call rain sensors outdoor normally closed switchs
12:29 UTC
Mercury Gas Rectifier
09:10 UTC
I bought a Multilaser M7 3G (brazilian technology company) tablet for my nephew and it came with an apple a8
11:35 UTC