I'm trying to make a small circuit that emits a sound that is annoying
to a barking dog but can't be heard by people (This is for my dog, to
get him to stop barking at the neighbor's children). So I guess I have
a few questions:

1. I've heard that 25-35 KHz is the ideal range to try with dogs, so
what kind of speaker would I need to buy? Should I just look up any
small speaker that has that range and try that? I would obviously have
to see if it had any effect on the dog before I built the rest of the
circuit, so it would have to have a range of around 30-40 feet and moderately loud.

2. I'm thinking of using a Voice activated switch such as
http://www.electronics-lab.com/proje...025/index.html . A
dog's bark can be up to 105db I have read. Good idea? bad idea?

Thanks.

 

The special old Motorola IC has not been made for many years.

A speaker is driven by a power amplifier.
Most speakers have trouble above 5kHz. Many tweeters are very fragile and don't go above 17kHz.
Old guitar speakers had a piezo tweeter that goes up to 20kHz and maybe higher. The piezo tweeters are still available.

Attached Images

piezo tweeter.PNG (134.6 KB, 8 views)

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Uncle $crooge

 

Of course such ultrasonic bark preventers are commercially available in many pet stores. Or do you just prefer to build your own?

 

Don't they just give the dog a shock (high voltage jolt) if it barks?

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Uncle $crooge