ULTRASONIC TRANSDUCER

CAT# XDR-24
$1.25 each
10 or more $1.00 each
Quantity:  
 
Matsushita #0D24K2. 0.95" diameter x 0.38" metal case. 0.65" long pc leads on 0.4" centers.
Average Customer Review:  (11 Reviews) Write A Review

Customer Comments

Average Customer Review:  (11 Reviews) Write A Review

A customer from Salem, OR USA
Excellent Experimental Sensor
These are excellent units. So much so I bought 30 of them for my robotics experimentation. They are extremely sharp, requiring a signal between 23.5 and 24.6khz. Units can be used as both receiver and transmitter. I set up a test rail, spacing two transducers 30cm apart. With a square wave of 5 volts fed into one transducer I read a signal of 60mv on the second transducer, used as a receiver.
In my application my receiver is an op amp with gain of 10 feeding an LM567 tone decoder. With 1.2 volts peak-to-peak, fed into the sending transducer, the tone decoder recogizes the signal at the distance of 1.5 meters, with the receiving transducer set at an angle of 45 degrees to the sender. These results assume some fine tuning of LM567 components

A customer from SAN FRANCISCO, CA US
Good and inexpensive if you know how to use it
To answer the previous review, yes, these transducers are capable of both transmitting and receiving. I have constructed two ultrasonic rangefinders with these transducers, one uses a single transducer for transmit and receive while the other uses two - a dedicated transducer for tx and the other for rx. Both configurations require a rindown period although the single tranducer configuration requires a significant ringdown period before you can start receiving. I have been able to range large objects up to 9 feet away and as close as 1.5 inches with the dual-transducer configuration.
See www.blueatomonline.com. Hope this helped a little bit.

A customer from On Earth as it is in Austin
A Nice Unit, But Watch Polarity
Characterized 320 of these units. Manufacturing tolerances are pretty tight overall. Average values for 320 units:
Clamping (DC) Capacitance (C0): 2.81 nF
Fctr: 24.495 kHz
BW (3dB): 906 Hz

Watch polarity, however. Some of these units are connected 'backward' internally. Two otherwise identical units will, for example, under identical circumstances produce (as receivers) electrical outputs that are 180 degrees out-of-phase. In some applications correct phasing is important, so beware.

All 320 units functioned satisfactorily at 21 Vp-p (sine) drive levels. 21 Vp-p seems to be the max drive level for this style of PZT, but there isn't much literature available Out There for these 24 kHz units (most extant literature - such as it is - centers on the more commonly available 40 kHz units).

Btw: I selected a handful of units for destructive testing and found that several units survived up to 122 Vp-p drive levels at resonance for the two-hour duration of this part of my tests. Several units 'bought the farm' at less than 35Vp-p drive levels, so I would assume the max drive levels for rest of the lot are probably 'all over the map' as well.

Hope this info was helpful.

A customer from Calif*
3 lobe cardioid
24.50khz +/- 0.25khz is the range, beyond which it's dead. Has a 3 lobe cardioid pattern. Sharp cutoff near 30 deg off center, then it picks up again. Ran it up to 20V p-p without issue. Leads fit standard proto boards without any force. Shroud easily comes off by destroying the metal nubs, giving you a look inside. No plastic in this part, so the leads don't slide up & down when you solder them.

A customer from yahoo
circuit to drive dog away from your neighborhood
http://www.supertex.com/pdf/app_notes/AN_H56.pdf