Posts Tagged ‘homebrew’

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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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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So how to do CW on a homebrew SSB rig?

Wednesday, March 13th, 2019

Pete Juliano, N6QW, has written an article on how to do CW on a homebrew SSB rig: The Answer is Not a Flippant: Carefully! Author's note: A friend in VK4 land made an inquiry about CW operation. I find that 99.99% of my operating time is SSB. But others spend...

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Homebrew SDR HF transceiver

Thursday, December 13th, 2018

Simonhk (G0FCU) wrote a series of posts on building homebrew SDR HF transceiver: However, what you might notice is the presence of image products in the waterfall. The processing of the signal suppresses all but the very strongest of these so they don't appear as audio but it is mighty confusing...

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Simple homebrew 6502 computer

Tuesday, November 13th, 2018

Sven Krasser blogged about his 6502-based homebrew 8-bit computer build: After completing my VGA Generator project a while back, I’ve embarked on a new electronics project: building a simple 6502-based homebrew 8-bit computer on a breadboard. There are a bunch of similar projects online from which to draw ideas. Some projects...

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N6QW Heathkit SSB transceiver

Friday, November 2nd, 2018

Pete Juliano, N6QW,  has a nice build log on his newest version Heathkit 40M SSB Transceiver: What are you thinking -- I am not trying to break any world record? My XYL asked me that question today -- why are you building another rig? Followed up by a snide comment...

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Homebrew PiHPSDR

Monday, April 3rd, 2017

g4fre built his own PIHPSDR, that is available at github: Having seen the Apache-labs version of the PIHPSDR I wanted to customise it to fill my needs, so I needed to build my own All the needed information , with the software, is at John Melton's github site The...

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Posted in DIY, R-Pi | No 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 »

Georges F6DFZ’s very stylish homebrew version of the Scout Regen receiver

Tuesday, July 5th, 2016

Dave Richards AA7EE has published an article about Georges F6DFZ’s homebrew regen receiver: Several months ago, Georges F6DFZ sent me pictures of a Manhattan project he had just completed, using Rex’s MeSQUARES, and I have waited far too long to share it with you. It began life as a copy of the...

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DIY Powerpole voltage and current meters

Friday, June 17th, 2016

Sverre Holm made his own powerpole voltage and current meters: Powerpole voltage and current monitoring is quite nice to have. One can buy commercial meters, but due to the availability of nice and cheap modules, it is very easy to make them oneself. To the right you'll see my combined voltage and...

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A new transceiver at N6QW, part 2

Wednesday, May 25th, 2016

Pete Juliano, N6QW, has been working on a transceiver project. He writes: Today we complete most of the mechanical work and the only item remaining is the RC Filter to turn the Square Waves into Sine Waves for the tune signal. We have had it on the air in the...

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EMRFD Direct conversion 40m receiver in a tea caddy

Thursday, May 5th, 2016

Flathagen has made a DIY EMRFD Direct conversion 40m receiver in a tea caddy: I woke up one day eager to build something simple (at least I thought is was simple) and opened up the first chapter in EMRFD and decided to build the 40m direct conversion receiver. I already had...

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Posted in DIY | 3 Comments »

Homebrew SWR and power meter

Monday, December 7th, 2015

Flathagen blogged about his DIY SWR meter project: The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler. The AD8307 amplifiers gives a DC voltage of about 25mV/dB of the input signal, which is amplified using an opamp (LM324)....

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Posted in Arduino, DIY | 1 Comment »

Just good enough 10 MHz reference

Wednesday, October 7th, 2015

Sverre Holm  writes: Some time ago I noticed that the Ublox Neo-7M GPS has a 10 MHz output which is locked to the GPS system's accuracy. Most people kept saying how useless it was due to excessive jitter unless it was cleaned up with a phase locked loop of some...

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Posted in hacks | 1 Comment »

HC508 Amiga 500 accelerator card

Wednesday, September 16th, 2015

A HC508 Amiga 500 accelerator card project from mc68k:  Finally, the project has reached a stage when complete system tests are possible The integrated CF + IDE allows running the complete OS 3.1 with WHDLoad. Key feaures: 68HC000 CPU running at 50 MHz (100% MC68000 compatibility) 40 pin IDE connector...

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Directional coupler

Monday, September 14th, 2015

Flathagen blogged about his DIY directional coupler: It is simple to construct the directional coupler. The transformers are FT50-43 toroid cores with 32 turns of 24 AWG enamel wire. The primary winding is simply a piece of RG58 through the torioid (i.e., one turn). Different designs use different toroids and...

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Hacking the Digital and Social System

Tuesday, August 4th, 2015

Voja Antonic writes: When you live in a totalitarian, controlled and “happy” society, and you want to be a hacker, you have to hack the social system first. Being just an engineer doesn’t cut it, you have to be a hypocrite, dissident and a smuggler at the same time. That’s...

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Brewmonitor: The Arduino-powered, cloud-based homebrewing controller

Friday, October 3rd, 2014

The Arduino and Cloud-based homebrewing controller by Martin Kennedy of TheBedroomLaboratory: It’s just a basic site, based on this tutorial, which is currently plotting the temperature in my sitting room. It’s got a PHP backend (Laravel framework with RESTful API), MySQL database and an AngularJS frontend with (n3-chart/d3 for the graph)....

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Electronics behind the homebrew TSA style scanner

Tuesday, December 14th, 2010

Here Jeri Ellsworth concludes her presentations on a homebrew TSA type body scanner by focusing on the components and coding. An FPGA is used for processing of the video signal as an alternative to a PC. The use of a "virtual ground" is an interesting aspect of the signal amp...

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Posted in hacks, RF | No Comments »

DIY Squishy dough for simple circuits

Saturday, November 27th, 2010

Here's a novel way to connect simple circuits. By mixing up your own conductive and non-conductive play doughs you can connect components without wires. Adds a new dimension to the term "wireless"! Just don't think it would be a good idea to go through airport security with a doughy substance...

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Posted in how-to | No Comments »

Recent Comments

  • gant: They still have a couple of the more expensive (but still considerably cheap) 5S-I-S01 in stock...
  • readybrek: Anyone got a any recommendations for a budget-priced hot air station?
  • William: lol I'm happy to waste 3c for each program/debug cycle... but probably not the time spent soldering a new device down to a proto board!...
  • 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!