Um...Me123 Posted November 3, 2005 Report Share Posted November 3, 2005 I'm designing something. Not sure what. :o ??? Sort of. OK nevermind that.I'm still new to electronics and somehow have trouble with 555. I think I need to spend a day to just figure them out. Anyway, I need an astable circuit that wil cause LED(s) to blink that can be adjustedd by a pot. This would be like christmas lights that have the knob on the box. I want them to go from steady on and down through fast strobe to either a very slow blink or completely off. I will need an output of about 3V. I just don't know what sized resistors and pot to use. The bigger (higher resistance) the pot the slower it will blink? Is there an easier way than using a 555?Thanks Quote Link to comment Share on other sites More sharing options...
boombar Posted November 3, 2005 Report Share Posted November 3, 2005 Here's URL with tutorial and simple schematics. Look for picture for Astable operation (in the mddle of document).http://www.uoguelph.ca/~antoon/gadgets/555/555.htmlSome simple schematics and calculator for 555 can be found here:http://ourworld.compuserve.com/homepages/Bill_Bowden/555.htmThere's even sample for driving LED'sTo prevent false triggering of 555, connect PIN4 to V+ (directly) and PIN5 to ground via 10nF ceramic capacitor.Hope this helps Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 3, 2005 Report Share Posted November 3, 2005 Hi Um...Me,Have you seen my chaser projects? They aren't simple because they sequence 10 LEDs.They have a pot for blinking speed and another pot for brightness.Their battery seems to last "forever":http://www.electronics-lab.com/projects/games/003/index.htmlhttp://www.electronics-lab.com/projects/games/004/index.html Quote Link to comment Share on other sites More sharing options...
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