Circuit to create a 2second pulse at random internals

calum112 · 10th August 2007, 09:33 PM

I'm struggling

. I need to make a simple pulse generator that will give me a 2second output (or thereabouts) randomly spaced with intervals of something in the region of 10 to 80seconds.
I have searched online and found surprisingly little. It doesn't have to be truely random so I was thinking about using a display driver and manipulating it such that the different combinations of its outputs equate to ten different time periods, this was getting a little more complicated than I had hoped though.

I have since found a product on the market which could easily be adapted to my use and it's very simple using only one IC. It is called an "annoy-a-tron" http://www.thinkgeek.com/gadgets/electronic/8c52/
I have been trying to identify the IC however those who I have found with one say there is no identification on it. So it's back to the drawing board but with that bugging knowledge there is a chip out there that does what I want...

Does anyone have any ideas how I could do it or better still know of a single chip solution?

Much appreciated

I_Forgot · 10th August 2007, 11:12 PM

Any 6 or 8 pin microcontroller could be programmed for what you want to do, or are you looking for something that doesn't involve a microcontroller?

I_F

jcx · 11th August 2007, 01:54 AM

the TI usb stick developement kit really lowers the threshold for programmable solutions:
http://www.ti.com/corp/docs/landing/...Other+OT+ez430

calum112 · 11th August 2007, 09:56 AM

Thanks for the suggestions guys. I have to be honest that I hadn't even thought about using a microcontroller, using one would explain all of my observations

.
I'll give it a whirl and keep this thread updated with my progress.

Cheers!

theChris · 11th August 2007, 03:32 PM

among other things, you can set up a one shot (555) with an DAC made of some resistors and a shift register where the input is the xor of two of the bits in the shift register. this creates a pseudo random number sequence where the statistical distribution is similar to random, but the pattern is predicable. as an input to the 555, it can be used to change the amount of time between pulses.

thats 3 chips though.

10th August 2007, 09:33 PM	#1
calum112 diyAudio Member Join Date: Mar 2007	Circuit to create a 2second pulse at random internals I'm struggling . I need to make a simple pulse generator that will give me a 2second output (or thereabouts) randomly spaced with intervals of something in the region of 10 to 80seconds. I have searched online and found surprisingly little. It doesn't have to be truely random so I was thinking about using a display driver and manipulating it such that the different combinations of its outputs equate to ten different time periods, this was getting a little more complicated than I had hoped though. I have since found a product on the market which could easily be adapted to my use and it's very simple using only one IC. It is called an "annoy-a-tron" http://www.thinkgeek.com/gadgets/electronic/8c52/ I have been trying to identify the IC however those who I have found with one say there is no identification on it. So it's back to the drawing board but with that bugging knowledge there is a chip out there that does what I want... Does anyone have any ideas how I could do it or better still know of a single chip solution? Much appreciated

11th August 2007, 03:32 PM	#5
theChris diyAudio Member Join Date: Dec 2001 Location: SIUE, Illinois, USA	among other things, you can set up a one shot (555) with an DAC made of some resistors and a shift register where the input is the xor of two of the bits in the shift register. this creates a pseudo random number sequence where the statistical distribution is similar to random, but the pattern is predicable. as an input to the 555, it can be used to change the amount of time between pulses. thats 3 chips though. __________________ if only it could be used for good, not evil...

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10th August 2007, 11:12 PM	#2
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	Any 6 or 8 pin microcontroller could be programmed for what you want to do, or are you looking for something that doesn't involve a microcontroller? I_F

11th August 2007, 01:54 AM	#3
jcx diyAudio Member Join Date: Feb 2003 Location: ..	the TI usb stick developement kit really lowers the threshold for programmable solutions: http://www.ti.com/corp/docs/landing/...Other+OT+ez430

11th August 2007, 09:56 AM	#4
calum112 diyAudio Member Join Date: Mar 2007	Thanks for the suggestions guys. I have to be honest that I hadn't even thought about using a microcontroller, using one would explain all of my observations . I'll give it a whirl and keep this thread updated with my progress. Cheers!

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