Vasily Ivanenko blogged about his input and RF preamplifier build: Above — Build of the input and RF preamplifier stage. I put in a 0 or 6 dB attenuator right at the input. That’s double-sided Cu+ board with copper vias joining the 2 surfaces intermittently and also at crucial ground points. Project info at QRP HomeBuilder blog.
Lukas Fassler has designed and built an Ultrasonic Anemometer project with Dirty Board PCBs. Full details at Soldernerd homepage.
A DIY USB power bank made from an old laptop battery from DoItYourselfGadgets: A situation many can relate to: an empty smartphone battery and no outlet around! That’s exactly why I recycled an old laptop battery into an USB power bank. This article will show you the basic powerbank circuit consisting of Lithium cell charging circuit, […]
Facelesstech made a light following bristle bot and wrote a post on his blog detailing its assembly: There is one thing missing from all my projects so far…..Something that moves. Bristle bots are very similar to hex bugs but are built from toothbrush heads and pager motors. I thought the idea of bristle bots was […]
Saulius made a DIY PCB inspection microscope and wrote a post on his blog detailing its assembly: Despite how good microscope you have, stand is still very important part of final assembly. And while there are many commercial ones made of cast iron, they might cost more than a microscope head itself. I decided to make stand […]
A business card size homebrew 40 meter XCVR project from Ray Ring: I tweaked my previous XCVR design to use push button tuning and made the board layout extremely compact. I improved the side tone injection to be absolutely perfect – not too loud, full break in and no clicks. I went ahead and integrated my switch […]
Raj has documented his DIY programmable relay switch using PIC16F1847 microcontroller: Here are the summary of the features that this programmable relay switch has: On-board +5V voltage regulator (operates at 9-15V DC input) OFF and ON time setup for the relay operation Option for cyclic run (maximum 100 cycles, after which the timer stops automatically) […]
Niklas Roy blogged about his DIY remote controlled beer crate: The “remote controlled beer crate” is actually just a flat plywood platform on which standard sized beer crates can be placed. It is driven and steered by two windscreen wiper motors with direct attached casters. Two swivel casters in front stabilize the construction. On its back, […]
Dimdim has designed and built his own stepped ladder attenuator, controlled by an Arduino: A few years ago I had an encounter with a ladder volume attenuator. I loved hearing the relays clicking away as they dialed-in the desired attenuation. Ever since then I wanted to design and build one for myself. The years passed, with […]
Joakim made a coundown clock for his wife and documented the whole process on his blog: The clock is built using an Arduino, and has a battery powered real time clock to remember the time while powered off. To make it truly stand alone I added the possibility to set the time and time-to-leave using buttons. The […]
Mike Doughty from PCB Smoke shared his DIY 110v temperature controlled soldering station in the project log forum: This project is build number 2 of a 110v temperature controlled soldering station. It is a follow-up post to the project that I was working on last October. Blog post with complete details here. This version has […]
Want to improve your posture? This wearable posture sensor from Coretech Robotics will remind you whenever you slouch and help you maintain a good posture: Posture sensors/monitors have been a recurring theme on this blog. They are supposed to remind you of your posture and prevent you from slouching, which can be a cause for […]
Tom Whitwell from Music Thing Modular built a DIY control board for Axoloti, that is available on Github: Axoloti is a very nice €65 audio board from Belgium, the closest thing I’ve yet seen to an Audio Arduino; lots of easy analog ins and outs for pots and switches, enough power to do interesting audio, […]
Chris Palmer (a.k.a nophead) has designed and built this coolometer project to quantify the cooling effectiveness of various fan: I was wondering about how I was going to calibrate the airflow reading but then realised that the flow rate is not actually what I am interested in. It is the cooling effect the airflow has, which is […]
Here’s a video tutorial on making a sequencer circuits from Casper Electronics: Learn how to make a variety of musical pattern sequencers using a few common electrical components and a breadboard. See the part 1 video on building oscillators here.
Ray over at the diyAudio forum has been working on his flip-flop/BCF project: I’ve just finished a project to roll up the developments into a more ‘finished’ build, feeding the balanced outputs from the flip-flop board into a Broskie BCF buffer stage. I’m using Nicks MJ Statistical Regulator for the B+ and one of Andrew’s indirect filament […]
Markus Gritsch made a nice USB volume control knob for his computer: After having been inspired by this Instructable  I also wanted to make a nice looking volume knob to attach to my computer. It uses the TrinketHidCombo library , but on a Digispark board, to have one more I/O pin which I use […]
A INA219 current sensor DIY Breakout board project from Juan Ignacio: Another small board, this time for a INA219. The INA219 is a high-side current shunt and power monitor with an I2C interface. For testing I used Rei VILO library with a MSP430G2553 and Energia, and I measured the power consumption for this simple circuit. Project info […]
Alex Weber has posted a new project on building a DIY Paint Machine, he writes: Here is my latest creature, the Paint Machine. It’s a machine the prints simple bitmaps with spray chalk on the street or sidewalk. Some of the key features: *dimension: width: 220cm, length: 38cm, height: 24cm, weight: 12kg *printing speed: ca. 0.036 km/h […]
Ladvien blogged about his Lab LED constant current controller board project he made using DirtyBoard PCBs: A little lab controller PCB I’m working on. It centers around four high-power constant current circuits meant to be driven by an Atmega328’s PWM. I hate working on anything mechanical in dim light; comes from dropping parts down under […]