19 September 2015

Transforming 7-segment LED clock into IV-6 VFD clock

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Take a cheap 4-digit 7-segment LED clock kit (like Bangood SKU142210, about 6.5 USD [red, without case]), design an adapter board and replac...
31 August 2015

QYT KT8900 - digital noise on audio

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One of the most noticeable defects of QYT KT8900 is a digital buzz that can be heard when the stock microphone is plugged in. This pr...
2 comments:
30 August 2015

AA to C cell adapter

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[In Italian: "Adattatore da stilo a mezza torcia"] So, your kid just received a new toys that requires batteries. Not plain simp...
26 August 2015

QYT KT8900 current consumption

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Is it me, or the QYT KT8900 manual does not specify the current consumption ? I measured it. The unit I got my hands on, performs as follow...
2 comments:
24 August 2015

QYT KT8900 arrived

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The parcel containing a QYT KT8900 has arrived today. It took less than 20 days and it was shipped through Germany to Italy. I haven't o...
22 August 2015

QYT KT8900 transceiver

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Online reviews do not rate it at the top of the category, but QYT KT8900 VHF/UHF mobile transceiver has worthy features for less than ...
14 August 2015

Insulated element support for ultralight VHF/UHF Yagi-Uda beams

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Once upon a time, 10 years ago, I used to build VHF beams for high mountain contesting that could be carried in the backpack. My best resul...
09 August 2015

biNixie Clock current consumption

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The biNixie Clock deserves a box with an antique look. But the technology inside remains modern, so why not use a rechargeable battery su...