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Red LED

some years ago I tried to build up a multivibrator circuit and i attached red LED so that i glowed around a frame the trouble is that it worked nicely for some time then after some weeks when i turn it on the LED would glow then start to dim then fade out totally.I used IC

555 for multivibrator with 9v DC supply got through a rectifier if any one knows the answer please mail it to me at snipped-for-privacy@gmail.com
Reply to
bala150985
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Did you use a resistor to limit the current?

A 330 ohm resistor, in series with the LED, would give a safe 21 mA current for a 9V supply and 2V LED.

Mark

Reply to
redbelly

Try a new battery.

Reply to
waz

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