Help for a 15k-30khz signal generator/Deer chaser - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st July 2009, 05:09 PM   #1
npapp is offline npapp  United States
diyAudio Member
 
Join Date: Feb 2006
Location: New Jersey
Default Help for a 15k-30khz signal generator/Deer chaser

Hi All, okay this is definitely for Everything else. I want to try my hand a sonic pest chaser to keep deer our of my yard. I see a few commercial offerings that seem very low powered and have questionable results. I need help designing a simple variable signal generator that will operate in the 15-30k range. I will then use that signal to power an T-amp (2020 chip) and a few piezo horns to irritate deer. Or at least that is the plan.

Any thoughts about this actually working. I may hook up this device to a motion sensor and high wattage spot light for some extra impact.

Any help would be greatly appreciated.

Thanks,
Nick
  Reply With Quote
Old 21st July 2009, 05:16 PM   #2
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
Design a small inverter that operates within that frequency range and connect the tweeters to the output.

Have you considered putting up an electric fence and using a current limited voltage multiplier to power it?
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 21st July 2009, 07:02 PM   #3
npapp is offline npapp  United States
diyAudio Member
 
Join Date: Feb 2006
Location: New Jersey
I found a few circuits for low frequency inverters as in DC to AC line use, but nothing for high freq. Will square wave inverters damage a piezo? is a sign wave better? Just trying to focus my research.

N
  Reply With Quote
Old 21st July 2009, 11:12 PM   #4
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
Check the power supply section.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 23rd July 2009, 12:16 AM   #5
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
Take a look at "Electronic Gadgets for the Evil Genius" by Robert or Bob Iannini. Searching for "evil genius" ebooks may turn up something, if you can't find it at the library or megabookstore. The "Pain Field Property-Protection Guard" is almost exactly what you're building. "More Electronic Gadgets For The Evil Genius" has the "Ultrasonic Phaser Pain-Field Generator", if that book is easier to find.

Also look out for "Build Your Own Laser, Phaser, Ion Ray Gun, & Other Working Space-Age Projects", since there were similar plans in that book. It's out of print, but if there isn't a copy in the library, it can be found on-line too. I made a rat repeller using the swept oscillator, but I simplified the driver part. It didn't appear to bother the rats much, though.
  Reply With Quote
Old 3rd September 2009, 08:41 PM   #6
ChrisA is offline ChrisA  United States
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by npapp View Post
Hi All, okay this is definitely for Everything else. I want to try my hand a sonic pest chaser to keep deer our of my yard. I see a few commercial offerings that seem very low powered and have questionable results. I need help designing a simple variable signal generator that will operate in the 15-30k range.
The key here is "variable" The deer will get use to just about any noise. Make it different each time. Maybe even from different speakers.

I'd build the device around a microcontroller and generate the audio waveform in software. This way you can include random sweeps, clicks and pops and if you have two channels of D/A on the uP you can try stereo to simulate a moving sound source.

30K may seem like a high frequency but it's low enough that you can do it completely in software on a five dollar micro controller.

Put a low pass filter in the sound before it hits the amp to kill everything above 30KHz and you will not have to worry about square-ish waves hitting the tweeter.

At the risk of starting a religious war I like the Atmel AVR chips. Yop may be able to build the whole thing using an Atmel "Butterfly" demo board. These sell cheap, well under $20 for the entire computer, LCD screen and all

If you want to go really cheap Atmel makes a "tiny AVR" that sell for about $1, remember that you can output audio through a one bit digital output but controlling the duty cycle and feeding this to an RC filter.

Look here for more
http://en.wikipedia.org/wiki/Atmel_AVR
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Low Distortion Signal Generator EchoWars Everything Else 150 6th March 2010 03:56 PM
Signal Generator Help Bengali Equipment & Tools 12 24th April 2008 05:20 PM
looking for a signal generator Ahmad_tbp Solid State 21 9th September 2006 12:37 AM
DIY signal generator? Loial Parts 13 19th September 2005 11:36 AM
signal generator help hizz_eye Solid State 2 3rd March 2005 11:25 AM


New To Site? Need Help?

All times are GMT. The time now is 06:49 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2