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Archive for the ‘DIY’ Category

Simulating 3-phase AC for energy monitor testing

Thursday, October 12th, 2017

Tisham Dhar blogged about his 3-phase synthesizer: Finding 3-phase is difficult, convincing the owner of the said supply to test some home made hardware is even more so. After building a 3-phase energy monitor my testing options for it appeared very limited. So I set about making my own low-cost 3-phase...

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Posted in DIY, testing | No Comments »

How to build your own RS232 to TTL converter

Friday, September 29th, 2017

A how-to on making a DIY RS232 to TTL converter by Jestine Yong: As I read many pages on the internet I saw there is a sort of adapter so called “USB to TTL adapter” who can communicate through with the uC. I had not the time to order one...

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Posted in DIY, tutorials | 4 Comments »

Building a 12V 110Ah battery bank using 80 32650 LiFePO4 cells

Monday, September 25th, 2017

Kerry Wong built a DIY battery bank using eighty 32650 LiFePO4 cells: During the past couple of weeks I have been busy making a large battery bank using the eighty 32650 LiFePO4 cells I bought on eBay. The battery bank I am building is a 12V (13.2V nominal) 4S/20P one....

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Posted in DIY | 2 Comments »

Build your own testing/programming jig

Friday, September 22nd, 2017

Sjaak has published a new build: Inspired by an old article from sparkfun and some tests I conducted myself I came up with a PCB that holds the pogopinholders and an lasercut acrylic fixture for the PCB on top. Using the dirt(y)cheap services from dirtypcbs.com the cost for this jig, including...

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Posted in DIY, testing | No Comments »

Network cable tester

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...

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Posted in DIY | 4 Comments »

DIY ISA game control adapter with parallel IO

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...

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Building a high capacity battery bank

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.

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The Boat PC – a marine based Raspberry Pi project

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:...

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Posted in DIY, R-Pi | 2 Comments »

Precision voltage source – voltage calibrator

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...

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Posted in DIY | 3 Comments »

Yet another CXA1191 FM radio receiver

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...

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Posted in DIY | 2 Comments »

HydroBot: Prototyping new modules

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...

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Posted in DIY, open source | 2 Comments »

Halogen floodlight SMT reflow

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...

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Posted in DIY, hacks | No Comments »

Controlling speakers with RADAR

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...

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YouTube channel IoT view counter

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...

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Posted in DIY | No Comments »

Dual purpose spot welder with pulse duration control

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...

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Arduino data logger update

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...

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Posted in Arduino, DIY | No Comments »

Adjustable gain LNA

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.

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Posted in DIY | No Comments »

DIY NAS

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...

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TB timer – Timed camera cable release

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...

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Posted in Arduino, DIY | No Comments »

3D POV display

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...

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Posted in DIY, how-to | 2 Comments »

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Recent Comments

  • Inyaki: Hi, Would you si king to point me the corsair's single 12v rail supplies? I am interested on it but I can't find it.....
  • peter: In the middle of the geek reading I get a tweet. Here I am
  • icserny: Unfortunately the DIY PCB homepage.is no longer available. Something happened...
  • Lukas: Yes, that's also how I do it, use an extension cable or ar least a 'spacer', i.e. a male and female header soldered directly together....
  • Ja: This looks very interesting. Unfortunatelly looks like the website Is not working now.