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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 [email protected]
 
R

redbelly

Jan 1, 1970
0
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 [email protected]

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
 
W

waz

Jan 1, 1970
0
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 [email protected]

Try a new battery.
 
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