Electronics

I am working identifying a problem in a VFD for a friend’s belt grinder, and I’ve ID’d the other ICs on but, but I wasn’t able to ID this last 8-pin one. I know it’s made by Microchip, but couldn’t pull anything up from the codes on the front.

I’m tinkering with the ATtiny 2 series (ATtiny 3224). I’m also starting to teach myself about switch mode power and surface mount design. I’m planning to drive two Toshiba SSM6K804R MOSFETs. They are logic level MOSFETs with a 4.5V drive. They have a gate capacitance of 1110pF (1nF).

I’m currently repairing a device and I’m trying to understand what this circuit board does and how, and whether it is causing the malfunction. While doing that I stumbled upon this resistor whose color code does not agree with my multimeter. I’m measuring 152.1Ω, but the way I’m reading the colors it should be the very common value of 69.1MΩ. If I reverse the order, I get 1.51Ω/15.1GΩ/151GΩ, depending on whether the second color from the left is silver, grey or white. Black would give me 151Ω, but it definitely is not black.

From the service manual for the Yamaha DX-100 FM synthesiser. The way this looks to me, both the 12v DC power supply, and 9v DC battery power get routed through exactly the same voltage regulator.

Hi Sparkies

AVR is one of my favorite chips as a hobbyist. 8-bits, manuals in the less than 500 pages region (very small compared to Cortex-M0+ which are closer to the 1000 or 2000 page long regions if we include instruction sets and other details), etc. etc. So I’m happy to see Microchip continue to support simpler 8-bit chips for those who need them.

Following a complaint filed by association HOP – Stop Planned Obsolescence, Steering Group member of the Right to Repair Europe Coalition in September 2017, the printer manufacturer Epson has been summoned before the criminal court on charges of planned obsolescence and misleading commercial practices.

I replaced my fridge ice maker a few years ago because part of the circuitry burned out. The replacement has also now burned out (though not nearly as badly). For reference, the burned part is supposed to hold onto the end of a copper peg that leads to the heating element (which melts the ice slightly so it can be popped out of the mold).

could i follow some soldering guide or is this beyond repair

I got and old kindle 8th gen (SY69JL) for free, ‘cause it couldn’t connect with any wireless network. I tried to do the bridge for popcorn hack as seen here (https://kindlemodding.org/jailbreaking/Legacy/Popcorn/KT3.html). Stupid as I’m, I used the 60w solder and I thing I ripped one of the pads. The damn thing doesn’t turn up (not even the led) or shows at lsusb. Is this now just an e-waste? It gets a little warm when puggled on the usb.

Video: Meet Argus: An Omnidirectional, Sea-Urchin-Like Robot That Defies Traditional Designs - Dauer: 3 min

“There is consumer pressure to back away from technology that is unnecessary to perform everyday tasks.”

So I was digging around AlternativeTo.net and Meshtastic-related Android apps called Bitmesh came across. And buried in the doc in the GitLab repo is a protocol spec the author seems to have wroten called MAM: Micro Apps over Meshtastic. It’s not really talked about anywhere I could find, which seems like a shame as I think it deserves way more attention than it’s getting.

Ham shame

Follow up to this post: https://startrek.website/post/37629244

Just a neat, theoretically-eternal circuit.

Nutze die App jetzt seit etwa einem Monat und finde sie deutlich motivierender als z.B. MorseMania. Die Gamification ist sehr nett umgesetzt. Leider ist es nicht Open-Source und auch so halbe shareware, jedenfalls sind einige Features hinter einem Abo-Modell versteckt. Zum erlernen des Zeichensatzes muss allerdings kein Geld in die Hand genommen werden.

Currently, in the cellular networks of countries, if a government agency declares a state of emergency such as tornado warnings or a public health emergency of some sort, the system can be activated to blare a loud alert tone on your phone and override do not disturb no matter what time of day it is.

Recently acquired my first oscilloscope (Siglent SDS804x HD with license key “hack” applied) and I’ve been playing around viewing various waveforms with it. I have a simple microcrontroller circuit generating a 900Hz rectified sine wave, and it passes through a capacitor to remove DC bias.

https://docs.rakwireless.com/product-categories/wishat/rak6421-wisblock-pi-hat/overview https://store.rakwireless.com/products/wisblock-adapter-board-raspberry-pi-rak6421

PC revival?

@Endof10 Good morning everyone,I am following for work a project of reuse of hardware dated by the Italian public administration (office PC between 2010 and 2015 as the start of use year).as a distribution I focused on zorin OS for the ease of migration from windows, general stability of the system, look and feel very nice and pleasant. my biggest obstacle is the finding of cheap SSD disks also used to put in place of the current mechanical disks, otherwise the machines are too slow, and I fear the boomerang effect.the machines will be donated to voluntary associations that request it, but I fear that with a mechanical disk that makes the machine too slow for modern use in 2026, the average user perceives linux as a slow operating system, without understanding that the problem is the hardware. I am also a volunteer of one of the main Italian environmental associations, legambiente, so I gladly offer myself for installation parties, individual support to those who request it. I saw this page on your site but I did not understand how I should move, I ask if you can help me and guide me thanks.

I was surprised to see this, but nice mainstream(ish) publicity?

So a while ago i got my hands on a old sewing machine sadly the foot pedal blew up on me and i also noticed that the machine made my fingers tingle (more on that in this old post here: https://sh.itjust.works/post/35395330 ).

This is an app I have been making since ~November, when I decided to switch from Android to Ubuntu Touch.

Migrating to the new meshcore.io site

geteilt von: https://feddit.org/post/28914833

After about 6 months, my project is finally complete. It’s the first significant circuit that I’ve designed myself, rather than just implementing someone else’s design:

Created my first meshcore solar powered repeater. Using the lilygo t-beam supreme and a overkill solar panel. All mounted on a din rail in a waterproof electrical cabinet.

I bought the linked a/c→d/c PSU 2nd hand. I did not look at the connector (assumed it was barrel) and just focused on power attributes. Then when I got home I noticed it has 4-pins. Luckily there is a diagram on the sticker, which says: