Updated 09/29/13



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What is MidnightScience Ultrasonics?

Midnight Science Ultrasonics is an offshot of The Xtal Set Society, founded in 1991. As with the Society, our goals are to encourage designing, building, and experimenting with ultrasound. Page last updated 09/29/13.

Is there really that much to do and/or say about ultrasonics? You bet! Here's a partial list of potential topics.

Finding Radio Interference sources due to Sparking on AC Power Distribution Systems  
Locating and Listening to Bats in Flight Studying the Basics of Ultrasound
Ultrasound Capable Microphones and Piezo Transducers The Ultrasound Spectrum
Measuring Parameters of Piezo Transducers Pressure Wave Equations
Design of Ultrasound Receivers Measuring The Integrity of Structures
Frequency Division Receivers Investigating Echo Location Systems
Heterodyne Receivers and more.
Time Delay Receivers ..



If ultrasound is a new topic for you, we suggest that you read our introductory articles on ultrasound. Just click on the articles tab at left. Keep in mind that we'll be adding more articles in the coming months. If you like to build and experiment, we suggest you get started by building our Ultra-RX1 or Ultra-RX3 receiver kit to gain some familiarity with nature's ultrasound sources, signal pressure levels, piezo transducers, and amplifier gains required. If you are interested in utilizing ultrasound to local radio interference due to AC power distribution sparking/arcing, take a look at our new 12-inch parabolic dish kit in combination with the RX-3 receiver kit. See the kits page.

Click here to listen to a recorded windows media file of a weak spark generated on the lab bench and copied by a Parabolic Dish and receiver at 40 feet.

Substantial gain is normally required with ultrasound equipment, challenging the designer to pay attention to circuit layout for stability. If a basic study of pressure waves is your goal, then wiring up a simple pressure commuications link, using 40 kHz transmit and receive piezo transducers (PZTs) might be the ticket. See our parts and kit pages for supplies.

Thanks go to M1GWZ (UK), NØNEB, and W8JHD, for beta testing the RX1.

Thanks go to N1BUG, WA5TBB, and NK7Z for beta and field testing the new RX3. See the kits pages.

Thanks go to Chuck Hines and Randy Rathbun for manual proofing and beta testing the new Parabolic Dish kits.

73s, Phil Anderson, WØXI.

Did you know? Tarsiers, 5-inch-long, nocturnal primates of the South Asian Islands chat at 70kHz ultrasound! That's one of the highest carrier frequencies among terrestrial mammals. Big Brown Bats chat in the 30-40 kHz range.

parabolic dish

While bats are in hibernation during the winter; spring, summer, and fall are a good time to listen. In October (in Kansas), we took a walk around the block, hearing plenty of insects buzzing and chirping, using the Ultra-RX1 receiver and a pair of 25-ohm Sony headphones. Click here to listen to a recorded windows media file.


How to Contact MidnightScience Ultrasonics:

You can reach us through the regular mail, by e-mail, or by telephone. If you call us while we're in the back room filling orders, you may get our voice mail. We check our voice and e-mail messages regularly, so please leave a message and we'll get back to you.

The Xtal Set Society
PO BOX 3636
Lawrence, KS 66046
Ph: 405-517-7347
Just ask for Patricia

Due to the high volume of spam, we have removed the e-mail address link from this site. Our e-mail is below in a picture. Just enter it into your e-mail address book, and send us a message! This extra step will keep us from getting massive spam that slows down our response to you.

We welcome your messages, and we'd enjoy reading about your ultrasound projects. The members of the Xtal Set Society enjoy them too, so we include portions of many of our letters in the Membership Correspondence section of the Xtal Set Society Newsletter. We also publish interesting articles submitted by members of the Society, so if you have something that you think other experimenters and builders would like to see, please send it in!

Please note: Unless otherwise stated, The Society assumes that submitted articles and other material are fit for print (free of copyright or other infringements) and that by your submittal you have given us your permission to print the material without restriction.

Go to the top-left of this page for links to other portions of this site.