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