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Archive for the ‘DIY’ Category

The K7TMG HF Morse code temperature beacon

Monday, April 23rd, 2018

AA7EE published a new build, a little temperature beacon: This was a fun little project – and it gave me an idea for a future one. Sometimes, I find that the more complex undertakings, which require more planning, can get to the point that they “take me over” somewhat. At...

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NickelBot – Laser controller

Monday, April 23rd, 2018

bdring made this laser controller for his wooden nickel engraver project and wrote a post on his blog detailing its assembly: Here are some details on the custom laser controller I made for the NickelBot, wooden nickel engraving machine. I want to use Grbl to control the machine. Grbl has...

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A web configurable ThingSpeak logger, build on AVR ATmega328

Thursday, April 19th, 2018

Davide Gironi posted an update on Xively logger project we covered previously: This embedded platform is a modular and configurable ThingSpeak data logger, built on an ATmega328 micro, usefull to send datapoints to your ThingSpeak feed. This project is an update to the Xively logger presented here See the full...

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Posted in AVR, DIY | No Comments »

Lipo charge/boost/protect board in 18650 cell holder format

Monday, April 16th, 2018

Peter6960 published a new build: So couple months ago, GreatScott made a video where he designed a circuit. Nothing too innovative, just the same TP4056 charger the MT3608 Boost combined on one PCB. He did add a Lipo protection circuit though, initially using the same DW01. But then, the Aha...

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DIY Boostbox hand crank generator project

Thursday, April 12th, 2018

A DIY hand crank Boostbox by lasersaber at LaserHacker: This easy to make box uses no batteries but can still power a lot of stuff.  It really is a very versatile little BoostPack based device.  It would be the perfect thing to have on hand in times of emergency. Project info...

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Posted in DIY | 1 Comment »

A 7400 frequency counter, on perfboard

Monday, April 9th, 2018

jaeblog published a new build: I like perfboard, especially the ones with plated trough holes. But I also like SMD components, and more and more fun IC’s are not available in DIP. So a while ago I designed some perfboard with 1.27mm pitch, making some SMD parts like SOIC stuff...

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Posted in DIY | 4 Comments »

Colinear antenna for 868MHz Lorawan Gateway

Thursday, April 5th, 2018

Mare writes, "This is description of coaxial collinear antenna for 868MHz applications.  I designed this for Lorawan gateway." Project info at Mare & Gal Electronics homepage.

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Traktorino, an open source DIY MIDI controller

Wednesday, April 4th, 2018

Here's an Arduino based open source MIDI controller by Musico Nerd, the Traktorino: The Traktorino is a powerful low-cost DIY MIDI Controller. It is based in the Arduino platform and it comes in DIY kit, or assembled. In its core, there’s a shield that connects to an Arduino Uno, which...

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Posted in Arduino, DIY, open source | No Comments »

Automatic fan controller for server racks

Thursday, March 29th, 2018

Dilshan Jayakody published a new build: In this post we describe fan controller which we designed for our 9U wall mount server cabinet. This fan controller is designed to drive a 12V DC cooler fan with pre-configured intervals or by monitoring the temperature of the server cabinet. Core components of...

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Posted in DIY | 1 Comment »

10MHz distribution amplifier

Thursday, March 15th, 2018

G4FRE built a 10MHz distribution amplifier: I have had a need for a distribution amplifier for a while now. Searching around I found the design by G4JNT in Radcom, which filled my needs. I redrew the circuit for 4 outputs and had PCBs made. (if you want one contact me!) ...

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Posted in DIY, PCBs | 2 Comments »

Low cost single cell battery pack simulator

Thursday, March 1st, 2018

Mare writes: There are many battery cell simulators available which could simulate battery cell(s). Unfortunately, none is emulating any of the digital protocols used by fuel gauge devices. Optimal solution to efficiently emulate given smart battery pack is to use custom solution based on battery cell simulator and fuel gauge...

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Lightronome 1 – The light based metronome

Monday, February 19th, 2018

Zoltán Gomori documented his lightronome build: I got a request, to design and build an electronic metronome. You can find several on the market, but the problem it is ether producing voice or the classical mechanical metronome. The requirement here was a visual effect. To be precise four LEDs for 4/4 beat....

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Posted in DIY, LEDs | No Comments »

ESP8266 Wi-Fi button – DIY Amazon dash button clone

Wednesday, January 24th, 2018

Rui Santos over at Random Nerd Tutorials posted a step by step guide on building an ESP8266 Wi-Fi button: In this project you’re going to build an ESP8266 Wi-Fi Button that can trigger any home automation event. This is like a remote control that you can take in your pocket...

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Easing the pain of SWD on modern DPS:es

Monday, January 8th, 2018

Johan Kanflo writes: On newer DPS:es, the SWD connector is a JST-GH (1.25mm spacing that is) which translates to “really tiny”. The annular rings where you need to apply solder and heat for adding wires are even smaller. This is why the OpenDPS SWD Bottle is handy. Add three P50-E2...

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Bus timer project

Thursday, December 7th, 2017

Limpkin published a new build: For once, this project was not for me... it was for my wife ! Every morning she takes the bus then train to go to work. If she misses her train, she has to wait for more than 30 minutes for the next one. Not...

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6×1 antenna switch

Thursday, November 30th, 2017

Mare published a new build: This is complete project for 1×6 antenna switch. It was bult in more than 50 pieces around the world and performs really good. Even big guns use it for their systems. The project was designed with help from other OMs (S55O, S59MA, S50LD, S51CT, S51ZJ,...

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Transistor radio series – The 7 MHz scratch synthesizer

Wednesday, November 29th, 2017

Vasily Ivanenko has written up documentation on his 7 MHz synthesizer project: Above — All 4 boards were built in re-purposed Hammond boxes. A PIC-based counter sits on top of the offset mixer. I build modular gear and this allows modification and fosters experimentation. When I build a final transistor...

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Posted in DIY, RF | No Comments »

Cheap DIY USB MIDI to CV

Thursday, November 23rd, 2017

A how-to on making a DIY USB MIDI to CV from DIY Synthesizer: This one is simple and does not require any expensive Teensy’s or STM32. It runs on the ATtiny85 using V-USB. The ATtiny is programmed with the Micronucleus bootloader and is firmware upgradeable incircuit. More details at DIY Synthesizer homepage.

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Posted in DIY, how-to | 2 Comments »

Overdrive guitar effects pedal

Friday, November 17th, 2017

Eddie over at Bantam Tools shared detailed instructions of how to build this DIY overdrive effects pedal: This project shows you how to make your very own effects stompbox! We'll go through the steps of downloading the .brd file, loading the file into our software, milling the board on the...

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Arduino controlled Dual Mono AK4490 DAC (part 1)

Thursday, November 16th, 2017

This article is the first of a series detailing the design and build process of an Arduino controlled Dual Mono AK4490 DAC by DimDim: The design goal was to do a dual mono design so as to maximize SNR and channel separation. A 4-layer PCB design was chosen so as to...

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Posted in Arduino, DIY | No Comments »

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Recent Comments

  • KH: IMHO PCA9685 is not a really good part for this application. It's a PWM LED driver for goodness' sake. NXP _does_not_ mention servos in the...
  • KH: So it's a servo library designed by a software guy, or a library targeted at embedded newbies, or a learner bike. Given the design of...
  • Max: A thing I wish I knew getting into Arduino-controlled servos is that the typical "180 degrees" servos DO NOT move 180 degrees for the standard...
  • Max: I have certainly noticed certain suppliers (like Adafruit, Pololu) being... "western-facing" - which is another way to say their prices definitely aren't Eastern Europe compatible,...
  • Shawn: Hello