Random ON/OFF Timer Circuit

[tom]

Hello All

I was wondering if anyone can help with or knows where I can find a
random ON/OFF timer circuit that will switch a 6-12v DC relay ON
between a random period of say 5 to 20secs and then turn OFF for
another random period of say 5 to 15secs.

I'm building an outdoor device and I'm trying to simulate random
movement.

Any help will be greatly appreciated.


Regards Tom McMurtrie

 

[tom]

John Fields wrote:

On 31 May 2005 18:27:50 -0700, "tom" <tmcmurtrie@keystone.otago.ac.nz
wrote:

Hello All

I was wondering if anyone can help with or knows where I can find a
random ON/OFF timer circuit that will switch a 6-12v DC relay ON
between a random period of say 5 to 20secs and then turn OFF for
another random period of say 5 to 15secs.

---
So, you want it to turn ON for a random interval of not shorter than 5
and not longer than 20 seconds, and then at the end of the ON period
you want it to turn OFF for a random interval of not shorter than 5
and not longer than 15 seconds, and then you want the cycle to repeat
forever?


--
John Fields
Professional Circuit Designer

 

[tom]

That is correct, the cycle would continue to repeat.

Regards Tom

 

[tom]

Hi John,

Thanks for your help along with the other guy's replies too.

I have had a browse through alt.binaries.schematics.electronic under
"Random ON/OFF....." but I haven't managed to see a link to the
schematic.

Would it be appropriate to forward it to me direct at
tmcmurtrie@@keystone.otago.ac.nz (remove the 2nd @)

Thanks Tom