I have a new post on Hackaday: A Simple $25 Robot Based On The ESP32.
A Simple $25 Robot Based On The ESP32
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Category Archives: Chatter
TVS Diodes
Oh man. Today I recorded a whole Mail Call video for the channel and at the end realized the microphone was off the whole time! Boo. Anyway. I was going to put some notes about my TVS diodes in the show notes, but as there is no longer going to be a show, I’m just making some notes here.
The TVS diodes I have I got here: DIP SMD Zener Diode Fast Switching Schottky TVS Diode Assorted Kit 1N4007 1N5408 FR207 1N5819 1N5822 1N4148 10A10 M7 SS14 2V-47V.
Particularly I ordered 210Pcs One way and 210Pcs Two way. I have stored both types in the same component drawer, by their ratings. The one-way devices have a polarity band and use the ‘A’ suffix on the component code; the two-way devices have no polarity band and use the ‘CA’ suffix.
Module Monday #3: KY-031 Knock Sensor Module | Learning Electronics In The Lab With Jay Jay
This post is part of my video blog and you can find more information about this video.
You can support this channel on Patreon: patreon.com/JohnElliotV
Silly Job Title: Connector Kingpin. I am the Connector Kingpin!
In this video we take a look at the Knock Sensor Module For Arduino 3Pin KY-031 Percussion Knocking Knock Sensor Module Diy Starter Kit KY031.
The demo code is here: 2025-10-20-KY-031-Knock-Sensor.ino.
Thanks very much for watching! And please remember to hit like and subscribe! :)
Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!
14500pa Cordless Hand Held Vacuum |
Let’s go shopping!
Filming At The Speed Of Light, About One Foot Per Nanosecond
I have a new post on Hackaday: Filming At The Speed Of Light, About One Foot Per Nanosecond.
2025 Component Abuse Challenge: A Self-Charging LED Flasher By Burkhard Kainka
I have a new post on Hackaday: 2025 Component Abuse Challenge: A Self-Charging LED Flasher By Burkhard Kainka.
Why your intelligence makes it impossible to take action
Hacking A Banned Chinese Security Camera
I have a new post on Hackaday: Hacking A Banned Chinese Security Camera.
F/0.38 Camera Lens Made With Oil Immersion Microscope Objective
I have a new post on Hackaday: F/0.38 Camera Lens Made With Oil Immersion Microscope Objective.
Summary of Differential Calculus
Electronics Project #20: Making the Self-Charging LED Flasher | In The Lab With Jay Jay
This post is part of my video blog and you can find more information about this video.
You can support this channel on Patreon: patreon.com/JohnElliotV
Silly Job Title: Outlet Overlord. I am the Outlet Overlord!
In this video we build the A Self-Charging LED Flasher By Burkhard Kainka. This project was submitted for the Hackaday Component Abuse Challenge 2025.
The fun thing about this project is that it works even though it doesn’t have a power supply. That’s because the LED sucks energy from the ambient light to charge the capacitors!
It took me three goes to make this work. The first go was with 100 nF ceramic caps on veroboard, and that didn’t work. The next go was with 470 µF electrolytic caps on breadboard, and that didn’t work. Finally I had a go with 1 µF polypropylene film caps and that worked!
We use the METCAL PS-900 Soldering Station for soldering.
We use the Pro’sKit SS-331H Desoldering Pump for desoldering.
We use the MUIN Solder Fume Extractor to clear the air.
We use the Riden RD6006 Bench Power Supply for test power.
We use the EEVblog BM2257 Digital Multimeter for voltage and other measurements.
We use the Brother P-Touch D210 Label Maker for making labels.
We use the Bysameyee Head-Mounted Magnifier for magnification and light.
We use the Scotch Titanium Scissors to cut things.
We use the Carpenter Mechanical Pencil to make notes.
We use the Hakko CHP 3C-SA Precision Tweezers for tweezering.
We use the Plato Model 170 Wire Cutter for cutting.
We use the Victorinox Swiss Champ Red Swiss Army Knife for its blade.
We use the Kaisi S-160 45x30cm Repair Mat as our workspace.
Thanks very much for watching! And please remember to hit like and subscribe! :)
Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!
Wowstick Wowpad Magnetic Screwpad |
Let’s go shopping!