21 July 2022

SGS integrated circuits H100/H200 series

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Shortly after posting about H 257 and H 258 never-seen-before(-by-me) ICs, I tried different search keywords and a datasheet popped up from ...
14 July 2022

Integrated circuits SGS "H 258 B1" and "H 257 B1"

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One of the Nixie boards I bought in FN Ham Messe 2022 does not use the usual 7441 Nixie driver + 74xX Latch combo, but rather some undocumen...
09 July 2022

Increase discharge current in XH-M239

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The Lithium Battery True Capacity Tester Module XH-M239 discharges 18650 cells with a current of about 500 mA. It takes about 6 hours to te...
04 July 2022

Li-Po capacity meter XH-M239: does it get it right?

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In the last months I've used the FT-817 on the field and noticed that the Li-Po battery pack wasn't lasting as much as I expected. I...
30 June 2022

Tune-a-Lite gas filled tuning indicator

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I learned about gas filled tuning indicators in the last month, as I started reading through an Italian forum packed with information on res...
26 June 2022

My Ham Messe Friedrichshafen 2022

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Yeah! I managed to be in Friedrichshafen ham fair 2022! We traveled on "day -1" so we were not in a hurry and we could be at the g...
17 June 2022

The James Knights Co. JKTO component - 2

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What was inside. From part 1, the circuit either had no output or produced a signal on 10 MHz. When I plugged in the oscilloscope, there was...
14 June 2022

The James Knights Co. JKTO component - 1

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In Marzaglia last May I picked up an anonymous circuit (click to zoom): I was intrigued by the large metallic cylinder on the octal base. Ju...