Re: on/off circuit



steve wrote:

A led is to be switched off.

A simple circuit is used to switch the led on/off with 9 v.

After the led is first switched on, the switch remains activated/
closed.

However, the led should turn off after a fixed time (even though the
switch remains activated/closed), without being turned on again.

That makes little reals sense to my mind but is perfectly technically
acheievable.

Why not use a momentary switch ?

Graham


.

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