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555 - Electrónica - Esquemas - TV - Áudio - Digital O 555 é um circuito integrado dedicado, projectado para aplicações de temporizador e oscilador. O 555 é um dos mais populares e versáteis circuitos integrados jamais produzidos, ele é composto por 23 transístores, 2 diodos e 16 resistências num chip de silício em um encapsulamento de 8 pinos duplo em linha DIP. Temporizador A frequência da saída de pulso é determinado pelas resistências R1 e R2 e pelo condensador C. Os pulsos Altos (HIGH) e Baixos (LOW) podem ser calculados por: HIGH time=0,69 (R1+R2) X C LOW time=0,69 (R2 X C) As unidades são para R em MW, C em µF, frequência será em Hz. Pinout 555 Usando apenas um condensador (capacitor) e uma resistência, o intervalo de temporização, ou seja, o tempo durante o qual a saída permanece em nível baixo, pode ser ajustado para de acordo com a necessidade de cada aplicação. O calculo do intervalo de tempo t. onde T é o tempo que leva para carregar o condensador C a 63 % da tensão aplicada. Montagens Básicas 555 Montagens Práticas 555 Gerador de Tons
Repairing Audio Video Electronic Components Introduction: You've been enjoying your entertainment setup for years! You've shown it off for your friends and family (yes, probably each and every time they've come to visit with you). The rest of us, though, are faced with a sometimes daunting choice: have the equipment repaired or really bite the bullet and replace it. I am here to offer you a third alternative: FIX IT YOURSELF! I know, you don't have any experience. These are all easy questions to address and just ignore that ugly old sticker! Over the years, I have learned that there are a relatively small number of ailments that cause electronics to self-destruct. Diagnosing the Problem: Common Symptoms (solutions are below): There are relatively few types of problems that cause the early demise of audio electronics (any many of types of electronics as well). Problem #1: Intermittent Electrical Connections: Has one of the speaker outputs on your amplifier, CD player, or pre-amplifier stopped working? Cause #2b: FIRE! Solution #1a.
ALLDATASHEET.COM - Datasheet search site, Datasheet search site for Electronic Components and Semiconductors and other semiconductors. Home WarrantyVoid FAQ - keyboard & sound toy modification, circuit-bending [guide for safer circuit-bending] This FAQ is about the modification of cheap music keyboards and electronic sound toys to convert them into unusual music synthesizers. Maintainer of this FAQ is CYBERYOGI =CO=Windler (e-mail: windle_c@informatik.fh-hamburg.de). This FAQ comes with absolutely no warranties - particularly I can not guarantee that the technical explanations and safety tips in this FAQ are fully correct, complete and up to date, therefore whatever you may do by instructions and tips found in this FAQ, you will do it solely at your own risk. I also can and will not teach you in this FAQ the general basics of electronics or synthesizers; on the internet are plenty of other sites to explain these. The newest version of this FAQ can always be found on the WarrantyVoid site: Why "tablehooters"? In Germany cheap sounding electronic beginner's keyboard instruments are called a "Tischhupe". other important tools:
Analog, Embedded Processing, Semiconductor Company, Texas Instru links for electronic keyboards, sound toys, circuit-bending YONGMEI INDUSTRY AND COMMERCE CO.,LTD. This is the Chinese manufacturer of the infamous Yongmei and Miles toy keyboards - the undoubtedly worst keyboards of the world (see here and here). Nowadays Yongmei makes beside these horrible yelling squeakboxes even professional MIDI keyboards with LCD and 61 velocity sensitive fullsize keys, but I have not heard any of these highend models yet. Funny is that there is even a voting on their site to rate the quality of their keyboard models, thus when you feel hoaxed by them, don't hesitate to set your checkmark accordingly.
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