Category: DIY

AF5HD’s L-Match Tuner Build

A fun project for every QRP enthusiast is an L-match tuner. We’ve built a couple here at MiscDotGeek and our latest build (shown here) inspired Billy Dunn (AF5HD) to build a similar tuner. We have to say, this one turned out better than ours did! The only trouble he ran into was that one of …

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Toroid Tip #4: Counting!

As a collector of tips and tricks that I can use when building radio stuff. I’m also a writer and I love sharing knowledge. When Todd, N0IP shared a tip that I can’t believe I didn’t think of myself, I just had to write it up! For the other three tips, see the link at …

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MiscDotGeek talks Radio Homebrew on W5KUB!

Here at MiscDotGeek we’ve been pretty busy with Real Life Stuff, and it’s been hard to find time to hack on radios lately. But that doesn’t mean we don’t have time to talk about hacking on radios! And that’s exactly what we did last week on the W5KUB Amateur Radio Roundtable broadcast. In fact, we …

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How To Stress Yourself Out and Accomplish Nothing

At 10 years old, I was just like I am now, but smaller, a lot less comfortable with myself, and I didn’t have a cool hat. I was in the 5th grade, and there was a science fair coming up at school. I’d done somewhat well in the 3rd or 4th grade science fair, and …

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Panasonic AM/FM Clock Radio Teardown

Have you ever been at a thrift store and wondered if you should buy that super cheap bit of electronics and salvage or re-use it? In this video we discuss how to tear down such a beast, and discuss things like what makes a good find, what parts can be easily re-used, and how industrial …

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QRP/ BITX40 and uBITX Case on sale!

UPDATE July 16th: It’s $6.99 until July 26th, the lowest we’ve seen it! Hey QRP Folks, I just saw that the Excellway EF01 case, so commonly used on BITX40 and uBITX builds is *ON SALE* until February 28th. Be sure to pick one or two up while the price is so low. They’re only $8.99 …

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Suburban Update: Replacing the O2 Sensor

I love my 1988 Suburban. With a Throttle Body Injection (TBI) 350 and 700r4 transmission, it can get half decent mileage for a full size SUV and still get up and go if you mash the go pedal. There’s no speed parts installed, but it’s an upgraded GM Goodwrench motor, according the the previous owner. …

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Dabbling in Circuit Art: The LM386 Spider

Last month I built the DC40 receiver (and wrote a giant series on it: Part 1, Part 2, Part 3 and Part 4. And somewhat unofficially Here!) and at the same time, Hackaday.com posted their Circuit Sculpture contest. Would it be possible for me to combine projects, and submit the DC40 as a circuit sculpture of some …

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KI7MNW’s Homebrew QRP Transceiver

Cameron Tribe, KI7MNW recently posted his homebrew QRP transceiver on the Amateur QRP Radio group on Facebook. It’s completely scratch built and borrows design elements from several sources including the BITX40. Follow all the way to the bottom for a picture gallery, schematics, and source articles. Tonight I finished my homebrew 40m QRP transceiver. I’ve …

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Building a Direct Conversion Receiver: Part 4

We last left off with having built the Diode Ring Mixer portion of the DC40 direct conversion receiver that we started on in Part 1. As was discussed, the Diode Ring Mixer accepts input from two sources: The antenna (through a Band Pass Filter) and the VFO. Now it’s time to examine these two critical …

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