## DIY Spark Gap Transmitter

This article plunges you into the mesmerrizing world of early radio technology through the assembly and analysis of a DIY spark gap transmitter. This project offers a practical insight into the fascinating dynamics of damped harmonic oscillators and explains charasteristics such the logarithmic decrement, decay rate, damping factor, q factor, and beyond. Prepare to spark […]
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## Total Harmonic Distortion (THD) from dBc

How to calculate THD from dBc This article supplements to my article titled THD Measurement with an Oscilloscope and FFT, which appeared in Elektormagazine [1]. Here I will explain how the formula to calculate THD-F from relative power values (in dBc) was derrived from the standard voltage-ratio formula. A more in-depth explanation of the entire […]
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## Thermal Design Basics | Practical Example

Thermal design is one of those things engineers don’t really learn in school and hobbyists often don’t even think about. This article is going to show some basic math with a practical example. One of my portable police scanners has an external 6V jack. To use it in my car I used my standard linear […]
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