Strobe circuit

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Rich
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Strobe circuit

Postby Rich » Thu Jan 09, 2014 10:58 pm

Hi all. I've just made a strobe circuit if anybody's interested. It uses 2 x 555 timers, a transistor and 3 x 3w LEDs. It runs off 12vdc

The effect at night with the lights off is awsome! Would be great for a disco.

Rich

phenoptix
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Re: Strobe circuit

Postby phenoptix » Thu Jan 09, 2014 11:00 pm

Always interested Rich!

Sent from my Nexus 4 using Tapatalk

Rich
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Re: Strobe circuit

Postby Rich » Fri Jan 10, 2014 1:38 pm

Image

Rich
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Re: Strobe circuit

Postby Rich » Fri Jan 10, 2014 1:42 pm

Image

These LEDs are megger bright, I've got 3 in series with a 3.3ohm 2w resistor

Rich
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Re: Strobe circuit

Postby Rich » Fri Jan 10, 2014 3:13 pm

The first 555 timer sets the frequency with the 100k pot. The second timer is in monostable mode and sets the duration of the flash via the 47k trimmer.
The problem with using just one timer is that in astable mode you can't have the on time less than the off time so when looking at, say a spinning fan blade it looks blurred because the LED is on too long.
The second timer in monostable mode is set to flash very briefly. You can see it better if you turn the frequency right down.


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