29 March 2018

Unresponsive Windows 10 laptop: automatic disk optimization

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I have a 3-years old laptop at home (bought February 2015). HP, quad-core A8 CPU, 4 GB RAM, 5400 rpm HDD (slowish, I know). It came with Wi...
18 March 2018

Modding a DIY USB Power Bank case with HT4936S

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Since I had some spare 18650 Li-Ion cells laying around, I decided to fit them in a couple of empty power bank shells sold online for few €...
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05 March 2018

Count-up timer with TIL305 - optimizations

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Looking at the 2x TIL305 timer I tried to imagine an even simpler version with lower parts count: could a single ATtiny2313 drive both ...
26 February 2018

Count-up timer with TIL305 - built

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Thanks to a pre-wired breadboard the circuit went together in an hour: From left to right: most significant digits and ATtiny4313, leas...
24 February 2018

Count-up timer with TIL305 - design

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After building few clocks and thinking of many more, I wanted to do something slightly different. The "new" idea came one evening ...
21 February 2018

Old vs modern high voltage capacitors

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Side by side comparison of the size of 500+ V capacitors, same values. 1955 vs 2018! Well, the dielectric is different!
10 February 2018

First MW reception on the RD-160

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So, with the lamp limiter just built I could dare to power the Radiomarelli RD-160 medium wave receiver. I scrounged home for filament lig...
06 February 2018

My poor man's AC limiter

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Reading around the Net, everyone mentions that powering old valve circuits under restoration should be done gradually by applying a lower...