Friday, September 15th, 2017
Dilshan Jayakody writes, "This is an automatic Cat6 / Cat5 network cable tester designed using NE555 timer and 4017 decade counters. This unit test all 8 wire lines of twisted pair network cable and indicate pass/fail status with single LED. We design this unit to test network connectivity issues in...Tags: NE555, network, tester
Posted in DIY | 4 Comments »
Tuesday, September 12th, 2017
Dr. Scott Baker has published a new build: My Xi 8088 homebuilt PC is running a little short on slots, so I wanted to combine the functions of a game control adapter and an 8255 PIO board. Two functions in one slot. As to why one wants each of these...Tags: ISA game control adapter
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Tuesday, September 12th, 2017
https://www.youtube.com/watch?v=cviyIIvBlto Kerry Wong has been working on building a high capacity battery bank using his DIY tab welder. More info on his blog here.Tags: battery bank
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Friday, September 8th, 2017
Domipheus has published a new build: In late 2015 I was doing my usual head-scratching about what gifts to get various family members for the holiday season. My wife mentioned making something electronic for my father-in-laws boat, and after a few hours of collecting thoughts came up with an idea:...Tags: Raspberry Pi
Posted in DIY, R-Pi | 2 Comments »
Thursday, August 31st, 2017
Mare writes, "What I missed in my workshop is nifty small programmable precision voltage source which can be used as calibration voltage source for testing and calibration purposes. I decided to make one, because instruments which have word “calibrator” have price with same digits as there is vocals in this magic...Tags: precision supply, voltage calibrator
Posted in DIY | 3 Comments »
Monday, July 31st, 2017
Dilshan Jayakody has published a new build: This is simple, but very high quality CXA1191S based FM radio receiver system. In this design we use Sony CXA1191S as FM tuner and TDA2003 as an audio amplifier. This receiver system is designed to work with 12V DC power source and it...Tags: CXA1191, FM radio, receiver
Posted in DIY | 2 Comments »
Tuesday, July 25th, 2017
Matthew Reed writes: ProtoModule is a HydroBot module designed to easily develop and test new monitoring or control functions that may someday go into a HydroBot module. It has 11 GPIO pins and the power rails broken out on a 0.1” pin header for easy breadboarding or interfacing with ribbon...Tags: hydroponics
Posted in DIY, open source | 2 Comments »
Tuesday, July 11th, 2017
David Sanz Kirbis built his own reflow device with an halogen floodlight, that is available on Github: First test was to check the speed of the temperature rise inside a standard halogen floodlight. Reflow soldering temperature curves are quite demanding, and some adapted ovens can't reach the degrees-per-second speed of the...Friday, June 30th, 2017
Speaker power controller made with a RADAR module from Scott Harden: I just finished building a device that uses RADAR to toggle power to my speakers when it detects my hand waiving near them! I have some crummy old monitor speakers screwed to a shelf, and although their sound is decent...Tags: device, radar
Posted in DIY | No Comments »
Tuesday, June 27th, 2017
Kenneth Finnegan built this YouTube channel IoT view counter, inspired by Becky Stern’s IoT counter: I've wanted an Internet connected read-out for some time now, inspired by the awesome shadow box IoT projects Becky Stern has been doing (weather, YouTube subscribers). I'm certainly not to the same level of packaging as...Tags: IoT, view counter
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Thursday, June 22nd, 2017
Kerry Wong published a new build: I had wanted to make a spot welder for a while. Most of the DIY spot welders use a momentary switch the primary side of the microwave oven transformer (MOT). Due to the simplicity of this design, it is very simple to make. This...Tags: 555, spot welder, TRIAC
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Tuesday, June 20th, 2017
An update on Edward Mallon’s Arduino data logger project we covered previously: If you need a logger with a cheap durable housing, it’s still hard to beat the Dupont-jumper build released in 2016. But sometimes I need more of a bare-bones unit for bookshelf test runs while I shake down...Tags: data logger
Posted in Arduino, DIY | No Comments »
Friday, June 9th, 2017
Mare published a new build: Low noise amplifiers are very useful. I built one with single BFG425W transistor with adjustable bias current. Project info at Mare & Gal Electronics homepage.Tags: amplifier, Ham, HF
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Thursday, May 25th, 2017
A DIY NAS project from Peter Scargill: So I’ve had a fair experience of these systems. Well, this blog entry isn’t about expensive NAS systems. It’s about a cheap one… really cheap that is – and DIY. How cheap? Well, about £12 depending on what you have handy. For this price...Tags: DIY, NAS
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Wednesday, May 17th, 2017
Steve Smith has published a new build: It’s taken some research but I have built a prototype with my trusty ARDX Arduino Uno kit Currently, the device changes mode with a press of the mode button which will later be incorporated in a suitable rotary encoder. I modified the prototype’s...Tags: Atmega328, cable release
Posted in Arduino, DIY | No Comments »
Friday, May 12th, 2017
Gelstronic shared detailed instructions of how to build this 3D POV display, project instructables here: In my project i use a spinning helix of LED strips. There are a total of 144 LEDs that can displays 17280 voxels with 16 colors. The voxels are arranged circularly in 12 levels. The...Tags: instructables, LED, POV display
Posted in DIY, how-to | 2 Comments »
Wednesday, May 10th, 2017
Nicu Florica @ Arduinotehniq writes: Schematic was inspired by article from Tehnium anual magazine 1990, but my schematic have extra ligts "games" A few time ago (3-4 years) I need a simple schematic for automatic dynamic games without microcontrollers, so I remenber my schematic... but I simplify my schematic as...Tags: dynamic lights, tehnium
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Tuesday, May 9th, 2017
https://youtu.be/V-PAW3KoB_A Yu Jiang Tham designed and built his own bartender robot named Bar Mixvah, that is available on Github: I built a robot that mixes drinks named Bar Mixvah. It utilizes an Arduino microcontroller switching a series of pumps via transistors on the physical layer, and the MEAN stack (MongoDB, Express.js,...Tags: 3D, how-to, Raspberry Pi, Raspian
Posted in 3D Model, Arduino, DIY, tutorials | No Comments »
Thursday, May 4th, 2017
Jesus Echavarria shared detailed instructions of how to make a simple tweezers for checking led polarity: I usually assemble by hand all the boards I make. I use SMD components, especially in 0805 format for resistors, capacitors and leds. With the last ones, I always have the same problem: I need...Tags: how-to, LED, tweezers
Posted in DIY, tools, tutorials | No Comments »
Thursday, May 4th, 2017
MicroTS, a smallest synth in the world from DIY synthesizer: The micro-TS is a key fob sized DIY synthesizer (61x41mm) with actually useable knobs like an analog synthesizer. The ball pen is for size reference. It has a one octave touch keyboard, 6 knobs and a stereo headphone output. Running on...Tags: synthesizer
Posted in DIY | No Comments »
