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Archive for the ‘DIY’ Category

Simple digital clock with PIC16F628A and DS1307 and 7-segment LED display

Thursday, June 13th, 2019

A simple digital clock with PIC16F628A + DS1307: In this new project I am again using PIC16F628A microcontroller. The goal is simple digital clock with 7-segment LED display and the clock will have no additional functionality - no alarm, no seconds digits, no date. The latter can be added in...

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Phase-locked inverter

Wednesday, June 12th, 2019

Here's a great write-up on building a phase-locked inverter from mitxela.com:  The input is at 50Hz and the output is at 60Hz. So for every 5 input cycles, we want to generate 6 output cycles. We will be synthesizing a sine wave in software, and there's no reason not to...

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PortL2 – Portable electric vehicle charger

Tuesday, June 11th, 2019

Here’s a project log covering the build of a portable level 2 electric vehicle charger by Andrew Rossignol: This is a battery-powered EV charger that allows destination charging where L2 charging is not ordinarily available. This can be used as a range extender for electric vehicles with smaller batteries. This...

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AF5HD’s L-Match tuner build

Monday, June 10th, 2019

Ryan Flowers writes,  "A fun project for every QRP enthusiast is an L-match tuner. We’ve built a couple here at MiscDotGeek and our latest build inspired Billy Dunn (AF5HD) to build a similar tuner. We have to say, this one turned out better than ours did!" More details on MiscDotGeek...

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D01: 2*15W guitar amplifier built using salvaged parts

Friday, June 7th, 2019

Davide Gironi writes, "The D01, litterally Discarica 01, is a guitar solid state amplifier build from salvaged parts." See the full post on his blog. Check out the video after the break. (more…)

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1750Hz tone generator

Tuesday, June 4th, 2019

Dilshan Jayakody published a new build: The 1750Hz tone bursts are often used to trigger repeaters. There are several methods to build 1750Hz tone generators which including TC5082 divider, using MCUs, etc. In this post, I present another 1750Hz tone generator which I built using 74HC4060 high-speed 14-stage binary ripple...

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DIY inline refractometer

Tuesday, May 28th, 2019

DIY inline refractometer project from Anfractuosity: The idea of this project is to image the refractometer output, then convert the position of the blue line, to a digital reading, using image processing. The idea is to measure the brix of wort during mash and sparging, so that sparging can be...

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Semiconductor radioactivity detector: part 3

Saturday, May 4th, 2019

Robert Gawron has made a new version of his radioactivity detector project and wrote a post on his blog detailing its assembly: In this post I will present a new hardware version of my sensor, older versions are described in part I and part II. In comparison to the previous...

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Posted in DIY, sensors | No Comments »

Open Trickler: The DIY smart powder trickler

Wednesday, May 1st, 2019

Eric Higgins has a nice build log on his Open Trickler project a bluetooth-enabled smart powder trickler from off-the-shelf parts for under $60: Fundamentally, this is not a hard problem to solve. Read the value from the scale, run a motor that moves powder into the scale, turn off the...

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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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Posted in DIY, RF | No Comments »

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Recent Comments

  • Joe Desbonnet: Ya, I can recommend the low melting point solder. I used brand 'ChipQuik' and it's amazingly easy to use.
  • Jerome: I need a new BusPirate for the Fablab ;) Many thanks!
  • Max: Seems like an unexpectedly violent way to remove the chip indeed. A hot air station should of course do the job just fine, but in...
  • jose: Part removal described here is pure butchery, the cheapest hot air station will do a fast and clean job removing the QFP, heat air to...
  • Cody: Yes please