uncleflo
Registered since September 28th, 2017
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PDF - Four or more layer PCB design for beginners using EAGLE
Saved by uncleflo on June 23rd, 2019.
With microcontrollers and other Integrated Circuit (IC)’s getting smaller and smaller Printed Circuit Board (PCB) design gets more and more difficult. 2 layer PCB design is getting common for small companies and hobbyists but 4 layer or more is a bit daring for those used to 2 layers. When designing a circuit with a Ball Grid Array (BGA) that has 100 or more pins a 4 layer circuit board is necessary, but more layers can make designing easier. With prices of 4 layer boards getting lower it can be a better idea to route a board thats hard to do in 2 layers in 4 layers as it can save a lot of time. This document will explain the basics of routing PCBs with 4 or more layers with Cadsoft Eagle.
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Philippe Dufour
Saved by uncleflo on June 5th, 2018.
Philippe Dufour says that people come to him because he creates watches that cannot be found elsewhere. "I'm obliged to innovate" he says pragmatically. But do not feel sorry for him. The challenge to create the world's first double escapement wristwatch was seized gladly. The aim of the double escapement is to compensate for errors in the rate of the watch, produced by the effect of gravity on the regulating organs. In this sense, it challenges the existing champion, the tourbillon device, invented by Breguet in 1801. Philippe Dufour's double escapement has proved already to be effective. Compared with the tourbillon, it possesses the additional quality of retaining all its efficiency when reduced to the dimensions of a wristwatch. The key to the concept is a complex differential system, positioned, with the two escapement mechanisms, on the fourth wheel. The two balance wheels operate completely independently of each other. The differential system averages out the differences between them, and thus reduces the potential error in rate by half. The differential system alone, without the regulating organs, has twenty-one parts, twice as many as the tourbillon. And yet the entire assembly is only 30 mm in diameter, and 4 mm high. It fits neatly into a 34 mm watch. How may the Duality be recognised? This master of complications says that, aesthetically speaking, he likes simplicity. For the Duality this means a smooth, finely polished case in yellow gold, rose gold, white gold or platinum. A silvered dial carries Dauphine-style hands pointing to raised hour markers and Arabic numerals. A distinctive feature of the dial is the unusual placing of the small seconds-hand at half-past seven, reflecting the layout of the movement. The strap is in top quality, hand stitched crocodile leather.
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