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Subject: Re: Circuits on using Ultrasonic Transducers

Date: 11/02/00 at 5:28 PM
Posted by: Brian Snell
E-mail: bsnell@lara.on.ca
Message Posted:

In Reply to: Re: Circuits on using Ultrasonic Transducers posted by omer abubakr on 11/02/00 at 11:32 AM:

Greetings. I believe that National Semiconductor Catalogue on Linear Devices may have useful info for you. There is a an Ultrasonic Transceiver chip, LM1812, which is listed together with several pages of application notes. Some of the circuits are for ranging devices (in air) from a few inches to several feet. Whether any of their suggested circuits can be modified for your particular purpose is questionable, but the notes do discuss many of the requirements and cautions involved with this form of design.
I did take a look at a recent catalog (Digi-Key) but do not see the LM1812 currently listed. National seems to be run by accountants these days and any semiconductor which fails to meet pre-set sales targets ends up by being axed. A pity, since, at one time, National had a great family of unusual chips with many varied applications. If you cannot locate a National data book, E-Mail me and I can send you the scanned pages of LM1812.

Lots of luck.

Brian Snell.

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