Item Description

Ultrasonic Sweep Frequency Generator IC.

New Microchip programmed with 3 different frequency sweeps. Made for use with our Air Ultrasonic transducers and other high frequency transducers.
Three modes of operation:

  • 1. Anti-Intrusion (audible, similar to LRAD)
  • 2. Crowd Control (borderline ultrasonic)
  • 3. Animal Control (fully ultrasonic)

One mode is ultrasonic, one partially ultrasonic, and one audible, all produce frequency sweeps. Use it to drive an audio power amp, or IRF530 mosfet, or a darlington driver like ULN2803 or ULN2074 to amplify the signal. Great for experimenting with PHASER pain field generators, dog training, etc.

The sweeps are programmed into an 8-pin Dip microcontroller and the modes are selected by grounding one of the pins. Output is a low duty cycle square wave which continuously changes frequency over several thousand hertz, and can be used either directly by just amplifying it, or by using an inductor in series with the transducer, which will convert the squarewave into sinewave, which drives the transducer more efficiently.

You could make a sweep generator like this using two 555 timers and about two dozen other components, but why do it the hard way? The speed of the sweep is also selectable, either fast or slow.

Please note that you CAN'T measure the frequency of this chip accurately with a counter. Frequency meters with 1Hz resolution have a gate time of 1 sec., during which the chip's frequency changes 250 times. So what you get is the average frequency, not the highest one. So if your counter reads 16kHz, that's the average frequency, while the actual highest frequency is close to 20 kHz.

The Animal control Mode can also be used as a Dog Whistle or Dog Trainer, and probably as an Insect Repellant too (since it sweeps through the mosquito repellant frequency). We also have

Phaser technology is also a basis of LRAD non-lethal weapon devices which were recently used to defend US Cruise Ship against Pirates near Somalia (Nov. 2005). . More info is in our air transducer auction And this chip's Anti-Intrusion mode is the closest of the three, to the LRAD frequencies used in its anti-intrusion mode.

And yet another use of Ultrasound (around 17.5kHz) is to discourage loitering of teenagers around stores, because only teenagers can hear that frequency. It becomes very annoying for them after about 10 minutes. In UK the power level is limited to 75db, but I don't know about any limits on ultrasound in US.

Please note:
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Positive feedback rating
Chip works as advertised. Sounds super nasty -- as it should!
Buyer ( Feedback score is 100 to 499)
Jan-23-07 07:28