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    SCurley's Avatar
    SCurley Posts: 7, Reputation: 1
    New Member
    		  
    #1

    Jul 3, 2009, 06:05 AM
    How do I make an LED flash repeatedly without using a 555 timer?
    Hi all, how do I get a capacitor to charge up and discarge repeatedly without using a manual switch or a 555 timer (using only resistors, capacitors, transistors and silicone diodes)?
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
    Ultra Member
    		  
    #2

    Jul 3, 2009, 06:43 AM

    Try this site:

    Howto build an oscillator circuit - Wikihowto: a howto site anyone can edit

    There are also some ideas here:

    http://www.google.com/imgres?imgurl=...num=5&ct=image

    You will undoubtedly have to amplify the output signal (use a transistor configured as a follower) to get enough current to drive the LED
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