KA7OEI's blog

Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei.com and modulatedlight.org. No AI is used to generate this content.

Sunday, January 26, 2025

A short-term capacitor-based "UPS" for mini (NUC-type) PCs

The problem Figure 1: A "Beelink" small form-factor PC. This unit sports a Ryzen processor and runs from an external 19 volt sup...

Saturday, December 28, 2024

Charging LiFePO4 batteries from a vehicular electrical system - the problems and a solution.

Figure 1: The Renogy RNG-DCC1212-20 - an isolated and current-limited battery charger, intended for use with vehicle electrical systems. Cli...

Wednesday, December 4, 2024

Frequency response of the RX-888 SDR at the high and low ends (Above 30 MHz, below 1.5 MHz)

Figure 1: The RX-888 Mk2. For information about improving reception below 1.5 MHz, scroll down to the text surrounding Figure 2. The RX-888...

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