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Late Pre- and Early Post- World War 2 Aston Martins

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One label for this post is "First and Last," but the subject actually is "Last and First."  In this case, the final pre- World War 2 Aston Martins and the postwar models when David Brown assumed ownership of the firm.  General Aston Martin background is here , that of the postwar "DB1" (a retroactive designation) is here , and for the 1950-vintage DB2,  here . Aside from modernized styling, postwar Astons featured the "A" form grille design that the marque has continued with detail variation until this day.  But even that feature had prewar origin in the form of a prototype/concept car, the Aston Martin Atom that was first displayed in 1940. Gallery 1938 15/98 Sports Tourer - Bonhams photo An example of the last prewar Aston.  Styling is 1933-ish, but still prevalent in late-1930s England.  The grille design was abandoned following this model's end of production. 1939-1940 Aston Martin Atom prototype/concept - Bonhams photo The idea was to ex...
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Digital Watch - Clock Circuit using LCD 16x2 and PIC 16F877a

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Today I'll introduce you how to make a simple digital watch with LCD 16x2 and PIC 16F877a. It's very easy to implement this clock and you can make this as a gift clocks for kids. I'll also provide you the source code of the clock so you can easily customize to make your own countdown clock, count up timer or something that more useful than an analog clock. OK. Below is the circuit diagram of the digital watch. Online Digital Clock Circuit Diagram
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Ferrite Transformer Turns Calculation for High-Frequency/SMPS Inverter

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On different forums, I often find people asking for help in calculating the required turns for a ferrite transformer they are going to use in high-frequency/SMPS inverters. In a high-frequency/SMPS inverter, the ferrite transformer is used in the step-up/boost stage where the low voltage DC from the battery is stepped up to high voltage DC. In this situation, there are really only two choices when selecting topology – push-pull and full-bridge. For transformer design, the difference between a push-pull and a full-bridge transformer for same voltage and power will be that the push-pull transformer will require a center tap, meaning it will require twice the number of primary turns as the full-bridge transformer. Calculation of required turns is actually quite simple and I’ll explain this here. For explanation, I’ll use an example and go through the calculation process. Let’s say the ferrite transformer will be used in a 250W inverter. The selected topology is push-pull. The power source...
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