Friday, July 19th, 2019
B. Perry writes: I've always been fond of the popular Nixie clocks made from old surplus Soviet nixie tubes. Nixie tubes are no longer made, so they're hard to acquire. Instead, I took inspiration from "Lixie" displays and made my own Nixie-inspired, LED-powered display. And in an unusual twist (for...Tags: ESP8266, LEDs
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Monday, July 15th, 2019
Josh built this 6CY7 dual triode valve amplifier: I’ve always wanted to know what the “tube magic” was all about. There is much opinion in the science of music production, probably because music and its perception is highly personal and subjective. Ive always imagined that since transistor amplifiers were “perfect”...Posted in DIY | No Comments »
Monday, July 1st, 2019
Shawon Shahryiar over at Embedded Lab shared a how-to on making a SPL dB meter: Sound needs a medium for propagation or travel. It can’t travel in vacuum. Normally air is that medium but sound can also propagate in liquids and other states of matter. I am not going to...Tags: audio, dB Meter, SPL
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Thursday, June 20th, 2019
The classic 555 timer on a breadboard: Here, I will show how you can make your own version of the 555 timer using just NAND gates, opamps , a transistor and a few resistors! Now, you may think what is the purpose of building this when you can buy the...Tags: 555 timer
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Tuesday, June 18th, 2019
Adam Zeloof made his own guitar pedal based on the Zvex Fuzz Factory: The Z.VEX Fuzz Factory is an amazing little fuzz pedal designed by musical and electrical wizard Zachary Vex. I was introduced to it through Matt Bellamy‘s unique guitar style, and fell in love with its out-of-this-world sound....Posted in DIY | No Comments »
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...Tags: ds1307, PIC16F628A
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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...Tags: Attiny85
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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...Tags: battery, car charger
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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...Tags: amateur radio, homebrew, QRP
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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…)Tags: amplifier, DIY
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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...Tags: 1750Hz, ham radio, tone generator
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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...Tags: measurement, refractometer
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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...Tags: python, radioactivity
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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...Tags: DIY, Raspberry Pi, trickler
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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.Tags: homebrew, Jones oscillator, push-pull oscillator
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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...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...Tags: ATtiny13, receiver
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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...Tags: 3D, LM2576
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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...Tags: AD8232, ECG
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