flashing led

[Tuurbo46]

Hi

Im after a little advice to a very simple problem which has got me all in a
muddle. I am currently designing a circuit with a comparator in it, and
when the comparator goes active high(+5V DC) on the output, i would like an
led to flash.

Her is the question i am going to ask. If i had 5V AC on the output i think
i could use an RC network to enable my led to flash on and off if i
calculated the values correctly? But on the DC version the RC circuit isnt
going to work? At this point im thinking i could use the 5VDC output to feed
straight into a 555 timer and allow this circuit to flash the led?

Please could somebody help me with my basic electronic skills.

Thanks

 

[Gareth]

Tuurbo46 wrote:

Hi

Im after a little advice to a very simple problem which has got me all in a
muddle. I am currently designing a circuit with a comparator in it, and
when the comparator goes active high(+5V DC) on the output, i would like an
led to flash.

The easiest way to do this would be to use a flashing LED. These are
easy to get, for example see:

http://www.maplin.co.uk/Search.aspx?Criteria=flashing%20LED&doy=31m1

Her is the question i am going to ask. If i had 5V AC on the output i think
i could use an RC network to enable my led to flash on and off if i
calculated the values correctly? But on the DC version the RC circuit isnt
going to work? At this point im thinking i could use the 5VDC output to feed
straight into a 555 timer and allow this circuit to flash the led?

You can use a 555 timer if you like. This would have the advantage that
you could choose your own frequency and duty cycle.

Gareth.

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