An Arduino based remote buzzer project by Flute Systems: Base station uses an Arduino Pro Mini 5V. The reason for having 5V in this circuit is the TM1637 7-segment display. We’re using a 5V active buzzer module, two wires – signal and ground. On the left are the Adafruit PowerBoost 1000C for 5V and the […]
Category Archives: DIY
Building a USB-C PD power hub
A detailed instructions of how to build a USB-C PD power hub @ bitsnblobs.com About a month ago, I showed you how to create a USB power hub using a DC power adaptor like this. One of the suggestions was to use USB type C as the power source and in this post, we will […]
DIY bluetooth fidget cube
Liviu writes, “Recently I was made aware of the fidget cube. However the cube doesen’t seems to do anything so as a request from somebody, I decided to modify a bluetooth VR box controller and insert it in a cube.” More details on Do It Yourself blog.
Automatically re-connecting low-voltage cut-outs for 12 and 24 volt battery systems
KA7OEI writes: In a previous post I described a simple circuit that provided a low-voltage cut-out that could be used in a battery-operated system – see the article “A latching low-voltage disconnect for 12 volt lead-acid and lithium batteries”. That circuit – intended mostly for lithium-based batteries – required manual intervention to “reset” the device, […]
Homebrew scratch-built uBITX
Check out VU3JVX’s awesome uBITX scratch-built homebrew project. See the full post on SolderSmoke blog.
MiniTiouner DATV receiver built
Andrew Garratt blogged about his MiniTiouner DATV receiver built: The MiniTiouner uses free to download DVB-S receive and analysis software called “Minitioune” written by F6DZP. The Software is hosted on the VivaDATV forum. So I registered and downloaded the software. More details on Radio Antics blog.
Homemade injection transformer for PSU loop analysis
Adil Malik made a DIY injection transformer for PSU loop analysis: Recently, I have been designing some SMPS and required some hardware to measure the actual loop response of the complete converters. People familiar with this area will probably know this can be done breaking the feedback loop of the converter and injecting a small […]
Nano controlled step attenuator
VE3POA writes: DuWayne KV4QB, has done a Step Attenuator project and was kind enough to give me a board he designed for it at FDIM this year. So, I will not reinvent the wheel here and follow his design. Thank you DuWayne. Here’s a link to his blog where you can read not only about […]
Building a Power-over-Ethernet (PoE) power supply using a DPS5005 module
Dr. Scott M. Baker has designed and built a PoE-powered lab power supply using a DPS5005 and custom PoE board: The DPS5005 is a DC-DC converter. It can accept an input voltage from 0 to about 55 volts or so, and will regulate an output voltage up to about 1 volt below the input. This […]
DIY mass spectrometer measures potassium in dietary salt substitute
In this video, Ben Krasnow shows to build and operate a simple mass spectrometer. More details in Ben Krasnow blog.
Homebrew 500 watt HF power amplifier
Jeff (K6JCA) has written a series of posts describing his homebrew project 500 watt HF power amplifier: I started this project back in 2016 — I had finished my Automatic Antenna Tuner (seen in the upper-left of the picture, above) and a PA project that would integrate into my FPGA-SDR and ATU system seemed like […]
DIY IoT garage door opener
Ludzinc wrote a series of posts detailing his IoT garage door opener. See the full post on Ludzinc blog.
A homebrew all-in-one RTL-SDR with screen and control knobs running on a mini pc
In this video, Pablo Sala (KI7OJL) shows how to build your own all-in-one receiver based on an RTL-SDR. Via RTL-SDR.com.
Internet connected fire/smoke alarm project
Martin Harizanov blogged about his cheap DIY IoT smoke detector: This project is an upgrade to a previous project of mine – the DIY IoT smoke alarm. It is a more advanced version that uses dedicated hardware rather than the generic “Funky” project + external components. In essence, the module integrates into cheap smoke detectors […]
Nano current meter based on an ATtiny84
Johnson Davies published a new build: This project describes a simple low-current meter I devised to check the sleep current of different microcontroller circuits, such as ones based on AVR microcontrollers. It’s capable of measuring currents of between 10µA and 30nA with reasonable accuracy, using an ATtiny84 and a few other low-cost parts Project details […]
DIY Analog resource monitor for your PC
Sasa Karanovic posted detailed instructions of how to build a physical dashboard for your PC, that is available on GitHub: The overall architecture is very simple; There is a python script that is running on a PC and collects CPU, memory, network and GPU usage. Then, it sends that information over serial COM port to […]
The Annoying CAPS LOCK warning buzzer
Glen Akins made a USB notification device that make annoying warning noise when CAPS LOCK is enabled: The only way to make CAPS LOCK even more annoying was to make it audible! Now never type a password in all upper case, join 500 lines together in vi, or turn a harmless forum post into an […]
Sequence controller
Eric Gunnerson has been working on a sequence controller project: Yeah. Those pins are beautifully aligned a very precise 0.1” from where they are supposed to be… Pro tip: Print out your design and put your components on it so that you can check the design. Meta pro tip: Follow your pro tips. Anyway, that’s […]
DIY AD9833 signal generator
Daumemo has been working on a DIY signal generator based on an AD9833 IC: In this post I am going to continue with the DIY signal generator based on the AD9833 IC where I have left in the previous part. Earlier, I have talked how I had built my first analog signal generator’s stage – […]
Pogo pins + laser cutter = test fixture
Eric Gunnerson made this DIY pogo-pin test jig: I decided to build a pogo-pin test jig, and since the approach I came up with was different than the other approaches I’ve seen I thought it would be worth sharing. I’m going to be targeting my laser cutter for fabrication, though I could have chosen to […]