# Electronic Dog Whistle Circuit

Need electronic dog whistle? It is widely known that dogs can hear sounds with frequencies higher than the humans cant hear. Sound frequencies higher than 20 kHz can be hardly detected by humans but animals are very sensitive to it. Basing this fact, an electronic dog whistle can be constructed and used to call dogs back from long distances.

The circuit featured here uses a piezo-ceramic element to generate the necessary high audio frequency. The oscillator generates a squrewave signal which consumes less current than a sinewave. The oscillation is produced by gates U1…U3, R1 and C1. These components work as an stable multivibrator in the circuit. Since the piezo-ceramic introduces a capacitive load into the circuit, it generates high frequency spikes during voltage level changes.

Transistors T1, T2 and T3, T4 serve as signal amplifier. Gates U4…U6 invert the signal from gates U1…U3 and create a bridge. The electronic dog whistle circuit is powered by a single 9 volt battery and generates a frequency of about 21 kHz.

## Electronic dog whistle circuit diagram

### Dog whistle Printed Circuit Layout

This dog whistle generates an output voltage of about 15 volts p-p. It sends out a sound signal of around 101 dB! One word of caution in using the whistle. Small babies are found to be sensitive to this sound although mature people don’t hear it. So, never use the dog whistle near babies!

##### Related Tutorials

• will

what is the ic1 component? It shows pin 4 to the positive and pin 7 to ground. Thanks, Will.

• Ron1406

@WILL : Pin 4 has to be pin 14 and the capacitor , I think it would be 1 nF. And IC1 is a Schmitt Trigger like CD40106b

• TonyQ

Could someone please tell me the units for C1 = 0.001 and the type of transducer used to produce this frequency?

Cheers

• roy

please do reply asap^^ that would really help me in my project. thanks a lot! ^^

• roy

how many feet can the produced sound be heard significantly?

Looking for the latest from TI?