Login▼/회원가입BASIC4MCU | 하드웨어 | 555타이머 | UP/DOWN FADING LED
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작성자 키트 작성일2017-08-25 10:16 조회2,253회 댓글0건본문
UP/DOWN FADING LED Circuit
A Circuit that fades an LED on and off.
Overview
These two circuits make a LED fade on and off. The first circuit charges a 100u and the transistor amplifies the current entering the 100u and delivers 100 times this value to the LED via the collector-emitter pins. The circuit needs 9v for operation since pin 2 of the 555 detects 2/3 Vcc before changing the state of the output so we only have a maximum of 5.5v via a 470R resistor to illuminate the LED.
Schematic
Video
This video walks you through building this circuit using a breadboard.
Parts List
1x - NE555 Bipolar Timer
1x - LED (Red) 1x - 470 Resistor (1/4W)
1x - 33K Resistor (1/4W)
1x - 100�F Electrolytic Capacitor (16V)
1x - BC547 NPN Transistor
1x - 9V Voltage Batteryhttp://www.555-timer-circuits.com/up-down-fading-led.html
http://www.google.co.kr/search?hl=ko&q=UP%2FDOWN%20FADING%20LED&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi
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