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...
15 January 2018

Time travel to 1956: Radiomarelli RD-160 Amico

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I finally did it: I bought a valve AM radio. Radiomarelli RD-160 "Amico". It is a Radiomarelli RD-160 "Amico" b...
13 January 2018

Can't get along with AMS1117 regulator!

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There is something wrong between me and AMS1117 linear voltage regulators: I keep frying them! It first happened on two adapters for breadbo...
16 December 2017

A missing trace in the Schlumberger 1240

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Alright. I've gone back and forth the diagram, read the comprehensive manual, looked for possible leaking capacitors both on paper and ...