Handy pack of 3 insect repellers Uses ultrasonic sound waves to drive pests away from the home garden or office Simply plugs in to the mains socket for ease of use These ultrasonic pest repellers use fluctuating ultrasonic sound frequencies to help drive away pests. Ideal for an average sized room of up to 25mandsquare. These units are small & discrete & operate via a single speaker with proven results showing their effectiveness in controlling unwanted pests. Handy pack of 3 insect repellers Uses ultrasonic sound waves to drive pests away from the home garden or office Simply plugs in to the mains socket for ease of use ...

Air ultrasonic ceramic receiver
- open type 25k Hz frequency 10mm diameter Aluminium case Industry standard open faced transmitterreceiver
...

Air ultrasonic ceramic receiver
- open type 25k Hz frequency 16mm diameter Aluminium case Industry standard open faced transmitterreceiver
...

Air ultrasonic ceramic receiver
- closed type 25k Hz frequency 25mm diameter Aluminium case Industry standard closed faced transmitterreceiver
...

Air ultrasonic ceramic receiver
- open type 40k Hz frequency 16mm diameter Aluminium case Industry standard open faced transmitterreceiver
...

Air ultrasonic ceramic receiver
- closed type 40k Hz frequency 18mm diameter Aluminium case Industry standard closed faced transmitterreceiver
...

Air ultrasonic ceramic receiver
- closed type 40k Hz frequency 9.1mm diameter Aluminium case Industry standard closed faced transmitterreceiver
...

- Uses advanced ultrasonic sound technology
- Helps to repel insect pests & rodents
- Plug-in mains operation chemical free


...

Operates in 6 10 V single voltage Wide operation frequency range up to 250k Hz Temperature controlled oscillator traces resonant frequency drift of transducers Built-in 32 steps time controlled gain amplifier Built-in band pass filter of less external tuned components Bi-direction IO for both driving pulse & echo Adjustable system clock for various detection range Suitable for car reversing aids tape measurements & other sonar ranging applications The PW-0268 ultrasonic sonar ranging IC is designed specially for ultrasonic echo ranging application. This chip consists of an external tuneable RC oscillator with a special feature of automatic frequency tracing which compensates the resonant frequency shift of used transducer due to temperature change a stage of fixed gain pre-amplifier setting externally a 32 steps time controlled gain amplifier a less external components band pass filter a comparator converts analogue signal to TTL digital signal for external µP processing & a tuneable timer acts as time reference for chip clock. ...