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Archive for the ‘DIY’ Category

Building a Jones Push-Pull Oscillator

Tuesday, April 23rd, 2019

Steve (VE7SL) has built a Jones Power-Oscillator using a pair of 6L6s and wrote a post on his blog detailing its assembly.

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Homebrew DMX-controlled RGB LED light

Monday, April 22nd, 2019

Glen has written an article detailing his homebrew DMX-controlled RGB LED light: This project is a small DMX-512 controlled, color-changing RGB LED light. The light can be controlled via the DMX512 protocol or it can run a number of built-in programs depending on how the software is configured. The light incorporates an...

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Qi wireless power receiver from scratch

Tuesday, April 2nd, 2019

Vinod made a Qi wireless power receiver using Attiny13, that is available on GitHub: I have only two aims while trying this. The receiver should get powered by the transmitter continuously. I should be able to control the power received by adjusting the error packets, in my case I am...

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Piggybacking USB onto an industrial push button

Wednesday, March 20th, 2019

Glen Akins has written an article detailing his USB-connected big red button project: In this project, I mount the electronics from my single-key USB keyboard project to the back of an industrial mushroom push button switch. The finished big red button now activates my screensaver with a single overly-large button press....

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Resistive load, constant-current power supplies, and a 3D printed desk lamp

Tuesday, March 19th, 2019

Dr. Scott M. Baker published a new build: In this video, I build a 3D Printed Desk lamp. The basic design came from Thingiverse, but I repurposed my LM2576 Constant-Current design to serve as a dimmer.  It all started when I found an interesting lamp on thingiverse, which used 75mm...

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Sound card ECG with AD8232

Monday, March 18th, 2019

Scott Harden built a DIY ECG project with AD8232, that is available on Github: Every few years I revisit the idea of building an ECG machine. This time I was very impressed with how easy it is to achieve using the AD8232, a single-lead ECG front-end on a chip. The AD8232 is...

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Raspberry Pi based indoor air quality monitor

Tuesday, March 5th, 2019

Dr. Scott M. Baker made this Pi-based environmental monitor and wrote a post on his blog detailing its assembly: For years I’ve followed the “uRadMonitor”, a device that does air quality monitoring and radiation monitoring. I’ve played with geiger counter projects before and frankly found them to be not very interesting....

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Building the ultimate USB power distribution system

Thursday, February 21st, 2019

Dr. Scott M. Baker published a new build: My goals include: 1. The ability to switch each device on/off with a rocker or toggle switch 2. Current limiting capability via a fuse or similar device 3. Overvoltage protection 4. Visual indicator (LED) of operational status 5. Multiple independent outlet See...

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Solar powered weather station

Tuesday, February 5th, 2019

Antalife has written an article detailing the build of his a solar powered weather station: To expand my microcontroller and programming knowledge I have decided to try and make a Solar Powered Weather Station. My goal is to record parameters like: *Temperature *Humidity *Air pressure *Air quality (something to do with CO or CO2)...

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Simple I2S stereo decoder with amplifier

Friday, February 1st, 2019

Dilshan Jayakody published a new build: In this project we build simple I2S stereo decoder with amplifier. To decode I2S data we use Princeton Technologies PT8211 16bit DAC. KA2206 audio power amplifier is used as driver stage of this system. Structure of this I2S amplifier is self-explanatory from the schematic....

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A transmit converter (and amplifier) for 630 and 2200 meters

Wednesday, January 30th, 2019

KA7OEI has a great write-up on building a transmit converter for 630 and 2200 meters: As the name implies, a transmit converter takes another frequency - such as that produced by a conventional HF transceiver - and converts it to another frequency.  In my case I use an FT-817 -...

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Pro mini logger project for the classroom

Tuesday, January 29th, 2019

Edward Mallon writes: Dr. Beddow’s instrumentation class has been building the 2016 version of the Cave Pearl datalogger for more than three years, and feedback from that experience motivated a redesign to accommodate a wider range of student projects while staying within the time constraints of a typical lab-time schedule....

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Posted in Arduino, DIY | 1 Comment »

Solar powered WiFi weather station

Tuesday, January 29th, 2019

A detailed instructions of how to build this weather station project by Open Green Energy: This Instructable is a continuation to my earlier weather station project. It was quite popular on the web, people around the globe made their own by following it and given valuable feedbacks for improvement.By taking consideration in...

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The Boris Beacon – A 1mW solar powered hifer beacon

Friday, January 18th, 2019

Dave Richards (AA7EE) has written an article detailing his 1mW solar-powered HiFER beacon project, the Boris Beacon: In this post from May of last year, I detailed the construction of a 1mW solar-powered HiFER beacon. I named it the Boris Beacon, in tribute to my neighbor’s cat. The beacon was never mounted...

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DIY Arduino based RC transmitter

Monday, January 14th, 2019

  Dejan over at HowToMechatronics posted a detailed how-to on building DIY Arduino RC transmitter: Now I can wirelessly control any Arduino project with just some small adjustments at the receiver side. This transmitter can be also used as any commercial RC transmitter for controlling RC toys, cars, drones and so...

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MusiCubes project

Monday, January 7th, 2019

Michael Teeuw published a new build: Now that the MusiCubes tray is assembled and the RFID-sensor and LEDs are working as expected, It’s time to add the last feature of the original concept: invisible capacitive touch sensors to control the volume of the music. See the full post on Xonay...

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Polar Coaster drawing machine

Thursday, January 3rd, 2019

Barton Dring designed and built a Polar Coaster drawing machine to draw custom, round drink coasters: I recently decided to update the Polar Coaster project. The primary reason was to update the controller to use Grbl_ESP32 firmware. I also thought I could make it smaller, lighter and remove a little...

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RTC based automatic LED lamp

Monday, December 17th, 2018

Dilshan Jayakody published a new build: This is real-time clock based automatic LED lamp which we originally designed to use as night light. This lamp can programmed to turn on and off at the specific time of the day. For example, it can program to turn on at 6 PM...

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Posted in DIY, LEDs, PIC | No Comments »

WBR-Oscar regen receiver

Friday, December 14th, 2018

A nice write-up on Sheldon's (N6JJA) version of N1BYT’s WBR regenerative receiver: This article is broken into two parts. First comes the “Oscar” preselector/preamplifier. As I said, I intended it to be either part of the overall receiver or used as a standalone where desired. The second part deals with...

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Guitar Amp builder notes — AF power amplifier dummy load

Wednesday, December 12th, 2018

Vasily Ivanenko has written an article detailing his AF dummy load project: I'll describe a simple 8, or 4 Ω dummy load to test your home brew guitar power amplifiers. Low cost 16 Ω / 25W wire wound, aluminum shell, chassis mount resistors seem abundant.  I got mine on eBay.  Wire wound...

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