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Archive for the ‘DIY’ Category

Big F’n 3D printer build

Tuesday, November 29th, 2016

Dan Beaven blogged about his big 3D printer build: Summary of Features: 8 Cubic foot print volume (capable of larger with minor changes - i.e bigger cast aluminum plate) - The reason I chose 1/4" Cast Aluminum plate was to make sure it was dimensionally stable when heated.  Anything else...

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36dB power attenuator for 20W

Saturday, November 19th, 2016

Lex PH2LB designed and built a 36dB power attenuator for 20W using PA1B power attenuator calculator: The attenuator can handle a maximum power of 20 watt and is used to reduce the power of a 5 watt transceiver. At first I did not realized why Lex designed the attenuator for 20...

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Posted in DIY | 1 Comment »

100W AF dummy load

Friday, November 11th, 2016

Dilshan Jayakody has published a new build: This is a quick post to showcase 100W 4 channel AF dummy load which we build to test the output stages of audio power amplifiers. This dummy load use 4, 8Ω 100W wire wound resistors which are available in eBay. In this unit all...

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DIY Arduino ProMini data logger

Friday, October 28th, 2016

Ed Mallon blogged about his DIY ProMini data logger build: Typical pro-mini loggers built with this design sleep at 0.25mA, before extra sensors are added. At that current draw, the logger should deliver approximately six months of operation on three brand new AA batteries with a 15min duty cycle; depending...

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Input filter and preamplifier – Jupiter modular receiver

Tuesday, October 18th, 2016

Vasily Ivanenko blogged about his input and RF preamplifier build: Above — Build of the input and RF preamplifier stage. I put in a 0 or 6 dB attenuator right at the input. That's double-sided Cu+ board with copper vias joining the 2 surfaces intermittently and also at crucial ground points....

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Classic vintage vacuum tube oscillator

Tuesday, October 18th, 2016

Vladislav Damyanov shares his vacuum tube oscillator project: The above you see is a result of my work in which i tried to go Vintage with my design. I was talking about the usage of Vacuum tubes when i mention the word Vintage, am pretty sure you will agree to it...

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MPPT solar charger

Friday, October 14th, 2016

Lukas Fässler has designed and built an MPPT solar charger: One of my main goals with this design is to archieve very low standby current, somewhere in the tens of microamps. The basis for this is a low-power buck on the basis of a Texas TPS62120 where the microcontroller can...

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Posted in DIY | 1 Comment »

Arduino Mega EPROM programmer

Friday, October 14th, 2016

An Arduino Mega Eprom Programmer project from Robson Couto, that is available on github: Recently I acquired a SNES. But it only came with a bootleg Mortal Kombat cartridge. Searching for games I found a lot of repro cartridges (Cartridges with the ROM swapped) being sold at local second hand...

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Automatic volume tracking for a TV

Wednesday, October 5th, 2016

An automatic volume tracker by KA7OEI: It occurred to me that I did have a reference on which I could base an outboard volume control: The internal speakers of the TV. I surmised that I could "listen" to the audio level coming out of the speakers and based on that, adjust the...

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Posted in DIY, hacks | 2 Comments »

RC2014/LL and RC2016/10

Monday, October 3rd, 2016

Scott Lawrence has written an article detailing his Z80 homebuilt computer, the RC2014: The RetroChallenge is upon us again! This time around, I plan on working on my Z80 homebuilt computer, the RC2014. (Website for RC2014, Order a RC2014) For a few months now, I've had my RC-2014 computer built, and...

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40 dB attenuator

Thursday, September 29th, 2016

A 40 dB attenuator project by Hartmut DK5LH. Hartmut uses the attenuator to measure the power of his transmitter (2 watts) with a power meter for -80 dBm to -10 dBm The attenuator is used to reduce the output power of the set to a value that is less than 0.1 milliwatt....

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Posted in DIY | 1 Comment »

μPC1237 based 2 channel speaker protector

Tuesday, September 27th, 2016

Dilshan Jayakody has published a new build: When working with expensive speaker system, speaker protector is an essential item to avoid any damages to speakers. In this project we build low cost speaker protector by using NEC's μPC1237 IC. The circuit in this project is based on μPC1237 datasheet and...

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DIY Desktop CNC with an Arduino

Wednesday, August 31st, 2016

Bob Davis has been working on rebuilding his DIY CNC machine: I have been busy rebuilding my DIY CNC machine. It will be all metal when I get done. It will also include a USB interface, likely an Arduino. None of my computers have a parallel port these days. So something...

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ICS501 simple frequency multiplier

Wednesday, August 31st, 2016

Scott from SWHarden has published a new build: Today I made a high frequency multiplier using a single component: the ICS501 PLL clock multiplier IC. This chip provides 2x, 5x, 8x (and more) clock multiplication using an internal phased-lock loop (PLL). At less than a dollar on eBay, $1.55 on...

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Posted in DIY | 4 Comments »

Homebrew dummy load

Saturday, August 27th, 2016

A simple DIY dummy load project from Flathagen: I have created a simple 50 Ω dummy load to test transmitters. I also added a simple RF diode detector so I can measure the peak voltage, and calculate the power. The dummy load consists of eight 100 Ω resistors rated at...

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Posted in DIY | 3 Comments »

R2-D2 build

Thursday, August 25th, 2016

Bithead942 blogged about his R2-D2 build: To really bring R2-D2 to life, I knew I had to do some great sturff with electronics.  I started with a Taranis X9D controller and a pair of X8R receivers configured for a full 16-channels.  I chose this platform mainly for its versatility, but...

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Posted in DIY, robotics | 2 Comments »

Mini CNC 2D plotter made from an old DVD drive and L293D motor shield

Thursday, August 25th, 2016

Sandeep_UNO posted detailed instructions of how to make this mini CNC 2D plotter using scrap DVD drive, L293D motor shield and Arduino. Project instructables here. Check out the video after the break. (more…)

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Posted in DIY, how-to | No Comments »

DIY USB power bank from laptop battery

Tuesday, August 23rd, 2016

A DIY USB power bank made from an old laptop battery from DoItYourselfGadgets: A situation many can relate to: an empty smartphone battery and no outlet around! That's exactly why I recycled an old laptop battery into an USB power bank. This article will show you the basic powerbank circuit consisting...

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Breadboard line driver module

Tuesday, August 23rd, 2016

Scott from SWHarden has published a new build: Line driver chips are one of my go-tos for quickly amplifying digital signals because they’re so fast to drop in a breadboard and they provide a strong output with very high impedance inputs and need no external components. Individual buffer of the...

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Posted in DIY, RF | No Comments »

Outmoded Sequencer project

Saturday, August 20th, 2016

LuckyResistor made a miniature music machine -the outmoded sequencer project and wrote a post on his blog detailing its assembly: I just started an interesting new project: The Outmoded Sequencer Project. It is an minimalistic music machine. You can use a 8×8 “programming” matrix to create simple melodies which are...

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