Category: Electronics

BITX40 Progress: Easier Tuning and a Microphone

In our last BITX40 Progress installment, I showed you the box contents, and a basic setup that I’d come up with. The controls and connectors were all on the top panel, and it was all loose. Since then, progress has been made! I’ve put up an antenna (more on that in another post) and built …

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Cheap Soldering Iron: Which one?

In this entry we’ll talk about my search for a cheap soldering iron. I’ve been burning myself with cheap soldering irons since I was about 10 years old and I taught myself various bad ways to solder. I’ve dabbled in electronics here and there since then, always curious but not really knowing what I was …

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BITX40: L-Match Tuner for an End Fed Antenna

Can you hear me now? With my BITX40 in a temporary enclosure and with the PTT switch and Mic connected, it was time to try to make some contacts. I’d tuned the trimmer capacitor next to L4 it so that I could get into the upper part of the US 40M band and ended up …

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Amateur Radio: Dissipating Static Electricity on wire Antennae

We’re trying to get my friends station setup complete. We got his radio installed, and an End Fed Half Wave (EFHW) 40-20-15-10M antenna installed. The problem is that electrical noise is fairly bad on it, and he can hardly hear some signals. One solution to this is to make an RF Choke out of extra …

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Build A 70 Amp Arc Welder

In this post my intent is to show you the original tutorial that I used to build my 70 amp arc welder (pictured left). I built it myself using Microwave Oven Transformers. I intend to build another one this year and will use these instructions again. Since the original site, aaawelder.com is offline, I utilized …

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