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</html><thumbnail_url>https://johnsonfrancis.org/techworld/wp-content/uploads/2024/08/The-Nostalgic-555-Timer-IC.jpg</thumbnail_url><thumbnail_width>1203</thumbnail_width><thumbnail_height>675</thumbnail_height><description>This is the 555 timer Integrated Circuit with which we used to make Code Practice Oscillators when we were short wave listeners to practise Morse Code while preparing for the Amateur License Examination. In those early days of integrated circuits, it was mind boggling to think that this tiny device incorporated the equivalent of 25 [&hellip;]</description></oembed>
