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Archive for the ‘DIY’ Category

Progress on the LDMOS amplifier

Friday, July 29th, 2016

An update on Pete's (N6QW) LDMOS amplifier project we covered previously: The real value of the breadboard test system is that it enables you to find/discover things that were not so obvious. Currently I have the Start & Stop buttons wired to the Arduino. I also have all six of...

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Posted in DIY, RF | 1 Comment »

Opto-isolated laser controller build

Thursday, July 28th, 2016

Scott Harden built his own opto-isolated laser controller and wrote a post on his blog detailing its assembly: My goal was to utilize a free hardware output line to signal to a device that I build to modulate the laser in a special way. This way there would be no...

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Homebrew Raspberry pi shutdown button

Monday, July 25th, 2016

Facelesstech made his own Raspberry pi shutdown button and wrote a post on his blog detailing its assembly: One thing I learn from my last shut down button was that the raspberry pi has internal pull up resistors so I didn’t need a 10k and a 1k pull up resistor on this design....

Posted in DIY, R-Pi | No Comments »

Homebrew Multimode Digital Voice Modem (MMDVM) adapter

Thursday, July 21st, 2016

Florian Wolters made his own version of MMDVM adapter: During experiments with digital voice mode in hamradio I discovered a nice project describing an adapter for D-Star, DMR and other digital modes based on an Arduino Due and a little PCB to be put on top. This unit is called...

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Posted in DIY | 1 Comment »

VXO – based PLL frequency synthesizer for 7 MHz

Tuesday, July 19th, 2016

Vasily Ivanenko made a VXO-based synthesizer: To make a VXO to mix with a ~7 MHz VCO, you'll need a crystal that is higher in frequency than the highest frequency you want to synthesize. Some rummaging revealed a bag of 21.4773 MHz crystals that I could divide by 3 to garner...

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Factory programming ESP8266 gadgets

Tuesday, July 12th, 2016

Johan Kanflo's Esprog pogo pin connector: The FTDI connector can be found on just about any ESP8266 design. If you are building a gadget to be deployed somewhere and not a full blown development board, the FTDI connector is somewhat overkill. And it is quite large. A few pins could be...

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DIY self sustaining solar powered backyard hydroponic garden

Friday, July 8th, 2016

Dan Beaven has been working on his DIY backyard solar powered hydroponic garden. More details at Dan Beaven's blog. Via the contact form.

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Posted in Arduino, DIY | 2 Comments »

Georges F6DFZ’s very stylish homebrew version of the Scout Regen receiver

Tuesday, July 5th, 2016

Dave Richards AA7EE has published an article about Georges F6DFZ’s homebrew regen receiver: Several months ago, Georges F6DFZ sent me pictures of a Manhattan project he had just completed, using Rex’s MeSQUARES, and I have waited far too long to share it with you. It began life as a copy of the...

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Posted in DIY, RF | No Comments »

HydroBot

Monday, July 4th, 2016

Matthew Reed writes: HydroBot is a modular control system for automating hydroponic gardens. This system is designed with three objectives in mind. First, it will facilitate optimal growing techniques by using scheduling and feedback control loops to maintain state and adapt to changing conditions. Second, it will simplify controls interfaces,...

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Posted in DIY | 3 Comments »

Reaction tester

Saturday, July 2nd, 2016

Reaction tester project from Vagrearg: The single gate-type NAND version was put onto a PCB and tested. It works like a charm. There were only 74AC00 chips available at the time, but they are just about the same as HC chips. You can get the design files, which are made...

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DIY smart glasses

Friday, July 1st, 2016

Harris has been working on his DIY smart glasses: The glasses themselves are based around an STM32F051K8 microcontroller (LQFP32 for easy soldering!). All the firmware is custom written though I got the LCD driver initialization codes from the BuyDisplay examples. The firmware is written using a somewhat “co-operative scheduling” with...

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Posted in DIY, hacks | No Comments »

SNAFU box

Wednesday, June 29th, 2016

A SNAFU box project by Bertho of Vagrearg: SNAFU Box consists of 24 LED strips (12V passive type) of varying size, which are controlled by a set of 74HC595 shift-registers and a transistor driver for each strip and RGB channel. The LED strips are used to backlight the lettering of the...

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Posted in DIY, LEDs | 1 Comment »

More Delta printer upgrades: WiFi and silence!

Tuesday, June 28th, 2016

David Crocker has been working on his Delta 3D printer project: After performing this upgrade, the printer is much quieter than before. This is because of the change from x16 microstepping on the Duet with A4982 drivers, to interpolated x256 microstepping on the Duet WiFi with TMC2660 drivers. The noisiest component...

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Posted in 3D fabrication, DIY | No Comments »

Make the world’s cheapest MIDI tester

Monday, June 27th, 2016

Jesse from Bent-Tronics has posted a tutorial on how to make a DIY MIDI tester: A quick and dirty (and cheap) MIDI tester.  Sometimes you just need to know if a MIDI controller is outputting anything. Even many high-end MIDI modules/boxes will have a "MIDI Activity" light, just to let you know...

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Posted in DIY, tutorials | 1 Comment »

WA2EBY IRF510 amplifier

Monday, June 20th, 2016

Flathagen has published a new build: The WA2EBY amplifier is a famous linear amplifier project published in QST in March and April 1999 by Mike Kossor WA2EBY. As this amplifier can give up to 50W out with 1W drive, it is a perfect pair for my Softrock RXTX amplifier. The...

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Posted in DIY | 6 Comments »

DIY Powerpole voltage and current meters

Friday, June 17th, 2016

Sverre Holm made his own powerpole voltage and current meters: Powerpole voltage and current monitoring is quite nice to have. One can buy commercial meters, but due to the availability of nice and cheap modules, it is very easy to make them oneself. To the right you'll see my combined voltage and...

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Homemade EDM (electric discharge machining) machine

Wednesday, June 15th, 2016

[embed]http://www.youtube.com/watch?v=-a1JEWbnvMo[/embed] In this video Scorchworks demonstrates his DIY EDM (electric discharge machining) machine : My homemade plunge EDM (electric discharge machining) machine built based on the book “Build an EDM” by Robert Langolois. The book consists of a series of articles that originally appeared in The Home Shop Machinist. I deviated...

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Remote controlled beer crate

Tuesday, June 7th, 2016

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...

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A CNC pickup winding machine built on an ATmega8

Friday, June 3rd, 2016

Davide Gironi blogged about his DIY ATmega based CNC pickup winding machine: A pickup winding machine it is used to wind a guitar pickup. You can find my previous ATmega manual pickup winding machine here This project is a manual / CNC pickup winding machine, built on top of an ATmega8...

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MIDI controller – Tannin 2

Wednesday, June 1st, 2016

Shantea has a nice build log about the DIY MIDI controller he built: For second revision of Tannin controller, I decided to use PCBs crafted specifically for Tannin 2, instead of using OpenDeck reference board. This proved to be a very challenging task, as I literally had to do everything...

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Recent Comments

  • KH: However innocent it may be, I'm not impressed by the choice made by the creator of the image. Now, I'm not the most politically correct...
  • cyk: A simple google search for "free arm ide" lists CooCox on the first page: http://www.coocox.org/index.html Supports a ton of different ARM M0/3/4 micros and all...
  • Stennly: Despite the popularity of STM32s, it may not be the best place to start. As mentioned already, the Silicon Labs gecko family is cheap to...
  • Pete Juliano: Since this posting on my blog I have received an excellent suggestion on how to quickly disconnect the 48 VDC from the amp so you...
  • Helge: Silicon Labs offer a powerful, unrestricted and completely free software development kit packaged with their Simplicity Studio IDE. It's built on Eclipse, and includes hundreds...