Pest Repellent

M

Mubashir

New Member

• Oct 12, 2006

• #1

I have made a pest repellent circuit, which was download from a web site named "FlashWebHost.com" bc547 transistor based. Accept piezo buzzer all things are same as diagram when i checked ultrasonic frequency that is near about 5000 hz. I need above 20000 hz and below 40000 hz. what i have to do. plz help

 

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akg

New Member

• Oct 12, 2006

• #2

reduce R2,R3, C1 ,C2
refer
https://en.wikipedia.org/wiki/Astable_multivibrator

 

Ayne

New Member

• Oct 13, 2006

• #3

Simply Use 555 Timer AS Astable_multivibrator...

 

Last edited by a moderator: Mar 17, 2012

mramos1

Active Member

• Oct 13, 2006

• #4

Search google for a "555 multiviburator online web calculator"

Then you can add a pot and tweak it to what you desire.

 

Hero999

Banned

• Oct 13, 2006

• #5

5000Hz, shouldn't be ultrasonic, unless you're hard of hearing. Don't use a piezo buzzer in this circuit because it won't work, use a piezo transducer.

 

HiTech

Well-Known Member

• Oct 13, 2006

• #6

It likely won't work well since the freq. should either alternate hi & low or be random freqs. tests show that a single freq. does very little to thwart pests.

 

audioguru

Well-Known Member

Most Helpful Member

• Oct 13, 2006

• #7

The frequency is 5kHz so that your cheap transducer can produce it and so that you can hear it. Then you think that it might do something (it doesn't).
With a supply of only 1.5V it will not be very loud.

 

mramos1

Active Member

• Oct 13, 2006

• #8

5Khz is not only going to bother the cats and dogs. It will bother you as well.

I think a 555 circuit and amp is best for you (like I said before)..

And 1.5 volts. Are you going to duct tape it on their head? Only way they will here it and it bother them.

 

Last edited by a moderator: Mar 17, 2012