25 June 2025

Sega Master System II power supply

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I was testing some Sega Master System 2 vintage game consoles with a friend and we couldn't get a signal out of them. I used a portable...
21 June 2025

HF portable June 2025

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Last Tuesday I had the chance to spend a couple of hours outside in a location where I could do some portable QRP HF. The setup is my usual ...
27 May 2025

DC plug for some Yaesu radios

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I am not sure the Internet has already found out, but some Yaesu radios share the same DC plug size. In my case I discovered that I can powe...
13 April 2025

Linux on an Intel DG35EC motherboard

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Intel DG35EC was (is?) a PC motherboard for Core2 Duo/Quad processor with embedded support for Serial ATA (SATA), PCI Express, Ethernet and...
30 March 2025

PABX Excelltel MK-208 recapped

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New look for the MK-208 This was an easy fix, on an easy to rework PCB. I replaced the five largest electrolytic capacitors in the MK-208 PA...
21 February 2025

PABX Excelltel MK-208 recap

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The (Excelltel) MK-208 PABX (and alike) is a modern local telephone analog exchange for small offices. "Modern" because it was ...
28 January 2025

Motorola MicroTAC GSM battery pinout (incomplete)

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A colleague has given me two Motorola GSM phones, a d460 and an International 8700 . According to timestamps on the battery packs, they wer...
31 December 2024

Composite video at variable refresh rate

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I am currently troubleshooting the CRT monitor of an Olivetti typewriter that produces composite video at 70 Hz refresh rate. Weird? Indeed....