Category Archive: Electronics

Feb 25

A Simple 5v Power Supply for Arduino, U3S and more

Many electronics experimenters and builders take the lowly 7805 regulator for granted, and we pop it in a circuit without a second thought and move along. But for beginners who are wondering how to power their Arduino or other 5 volt project (such as the QRP Labs U3S) from a 12v-13.8v power supply, the 7805 …

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Jan 25

Ham Radio for $100 Part 1: VHF

It is often said that ham radio is a very expensive Hobby. It is my aim in this blog post to show you that while ham radio can be expensive, it doesn’t necessarily need to be expensive to get started and have a lot of fun on the air! We’re going to look at three …

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Dec 14

Low Budget Tools and Parts For The Budget Builder

The uBITX is now out, QRP Labs QCX is on the market, and the BITX40 is still a fantastic kit- Hams all around the world are preparing burn some solder and get on the air! If the BITX40 has taught me anything it’s that you don’t need anything fancy to get your radio on the …

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Nov 30

BITX40 PTT Enhancement for Digital or CW

The BITX40 PTT is a simple circuit: A switch grounds out the PTT Relay and the transceiver goes into transmit. As a stripped down SSB radio, this works fine and is simple and uses few parts. Why modify it? The challenge is that the PTT circuit is not solid state. The PTT circuit is just …

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Nov 20

MultiBand BITX40 Conversion

MultiBand BITX40 Introduction In Several Older Posts I’ve touched on ways that you can make a multiband BITX40 radio. While those methods worked, they were experimental. The Dual BandĀ option will likely work fine, but I found it overly complicated for the purpose. In this post, I’m going to show you a way that you can …

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