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Please help with ultrasonic animal repeller circuit

sreerajdevan

Jan 30, 2012
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HI FRIENDS,
I HAVE A ANIMAL REPELLER CIRCUIT CIRCUIT DIAGRAM AS SHOWN:
I HAVE WRKED ON THIS BUT NOT WORKING AS PREFERRED

CAN U PLEASE CHECK THIS ONE AND REPLY ME IF YOU FIND ANY FAULT ON THIS.
PLEASE ITS REALLY URGENT...


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duke37

Jan 9, 2011
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An interesting mix of integrated cicuits.
1. I do not know what the switch does, if it selects one of the outputs of the Johnson counter, then what are the diodes for?
2. Most of the circuit is digital with either a high or low voltage at some point and a tip is that if you measure this voltage with an analog voltmeter, you will see some intermediate voltage depending on the on/off ratio. Work your way from the oscillator output to the flip.flop output.
3. Have you installed the diodes the right way round?
 

OLIVE2222

Oct 2, 2011
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Hi,

On the original design (link here under) few frequencies are generated sequentially.
http://ratrepellent.net/home-improvement/rodent-repellents/
Here you select them with a switch but it's easier to do it by select R or C directly on the 555.
One way to test it can be to test the right part first (555+4013+driver) by connecting R5 to the +12V

Olivier
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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So this circuit will produce short bursts of the selected frequency.

Any reason for the mod?

BTW, if you don't want short bursts, you can get rid of almost half the circuit (the op amp and the 4017).
 

sreerajdevan

Jan 30, 2012
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hii dear friends,
it was by mistake i send u that wrong diagram.
there is no rotary switch in it.
attaching the original one, which i already completed the circuit work and checked.

here my purpose is to repel dogs.., around 25 khz to 35 khz may be needed.

but i didnt get the actual output .

what will be the cause?

can you please help me on this.
 

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(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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but i didnt get the actual output .

What did you get?

what will be the cause?

Can't tell unless you can provide more information.

can you please help me on this.

We'd love to.

What test gear do you have?

Have you tried lowering the frequency to an audible range so you can verify operation with your ears?

The current frequency range is 31kHz to 100kHz. Increase C2 to 8.2nF and the frequency range will change to 1.2kHz to 4.3kHz which is well within the audible range.
 

duke37

Jan 9, 2011
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You could connect two leds in inverse parallel and then connect these through a 1K resistance to your sounder. If the circuit is operating properly, both leds will light.
 

sreerajdevan

Jan 30, 2012
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I verified the output using a ultrasonic transducer...
when connected its receiver to the C.R.O i got about 20 khz- 30khz varying output
But it doesn't affect the dog anyway...i tried so many times at different dogs..but they seems like listening to a gud music.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Maybe the dog's simply don't find the noise offensive enough?

The trick is (probably -- I'm not a dog so I can't say for sure) to get the sound pressure high enough.

The speaker may not be highly efficient at those frequencies, and an ultrasonic transducer may be efficient over only a very small range of frequencies.
 
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