Please help me ..... I want trasducer with 5 MHz .. how can I do it ....

blueroomelectronics

Well-Known Member

• Oct 19, 2007

• #21

I'm not aware of 5MHz bats either, they can go as high as 150KHz.
https://hypertextbook.com/facts/1998/JuanCancel.shtml
I wonder if the OP can fine tune quartz crystals with sandpaper. A 32KHz watch crystal could become a 5MHz one.

 

Papabravo

Well-Known Member

• Oct 19, 2007

• #22

I wonder if Sisyphus ever did get that rock even halfway up the mountain. Just because something can be done doesn't mean it should be done. A 5 MHz. transducer sounds like bumpf to me.

 

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Abdullah2121

New Member

• Oct 20, 2007

• #23

thanx guys ..... ok if my idea is silly , so what's the good idea , if u have it please tell me ....

 

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Abdullah2121

New Member

• Oct 20, 2007

• #24

And how i can do this circuit with max depth , forget the 1 meter , i want the max depth in air .....

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Oct 20, 2007

• #25

Why not use 40KHz like everyone else does?.

 

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Abdullah2121

New Member

• Oct 20, 2007

• #26

ok if i use the 40 kHz , how i can get distance?

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Oct 20, 2007

• #27

Abdullah2121 said:

ok if i use the 40 kHz , how i can get distance?

Click to expand...

What distance do you want?, ultrasonic tape measures are commonplace, and usually go up to 10m-12m.

 

blueroomelectronics

Well-Known Member

• Oct 20, 2007

• #28

A parabolic dish might work.

If you need distance you'll might want to look at laser rangefinders. Of course RADAR would work too.

 

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Abdullah2121

New Member

• Oct 20, 2007

• #29

I want only 1 meter , how can i do it ?, with 40khz ultrasound transducer

 

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Abdullah2121

New Member

• Oct 20, 2007

• #30

somebody give me circuit, idea, procedure, to work on it

 

ericgibbs

Well-Known Member

Most Helpful Member

• Oct 20, 2007

• #31

Abdullah2121 said:

somebody give me circuit, idea, procedure, to work on it

Click to expand...

Search the web for: '40KHz ultrasonic distance'

I have just checked and there are lots of sites and info.

example.
http://www.btinternet.com/~leerwilson/design.html

 

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Abdullah2121

New Member

• Oct 20, 2007

• #32

thanx man for helping me

 

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Abdullah2121

New Member

• Oct 20, 2007

• #33

but they don't give any information about the max distance for these circuits ....

 

ericgibbs

Well-Known Member

Most Helpful Member

• Oct 21, 2007

• #34

Abdullah2121 said:

but they don't give any information about the max distance for these circuits ....

Click to expand...

The maximum distance [ for a reflected signal] is dependent upon lots of factors.

Examples.
transmitted acoustic power
beam width of transmitter transducer
transmission frequency.
size and type of reflecting surface.
alignment of the transmitter and reflector.
sensitivity of the transducer/receiver circuits

With a few watts of power at 40KHZ, with a good reflecting surface you should get at least 20mtrs in air.

You were going to give me details of your transducer.???