The Magenta Mk4 Bat Detector
'Listen to the ultrasonic echo-locating 'chirps' 'smacks' and 'clicks' from these amazing creatures.
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High level Audio output
Built in front-facing weatherproof speaker
Murata Miniature Microphone
20 to 130 kHz frequency range
Advanced low noise IC pre amplifier stage
Improved, highly stable heterodyne oscillator
New 'active filter' audio stage
Increased gain and sensitivity
Convenient side mounted Headphone socket
Extra low level output Tape Recorder socket
Built-in LED torch
All new circuit board construction and assembly
2-year manufacturer guarantee
The detector circuit is a 'heterodyne' type.
The incoming ultrasound is filtered to remove ordinary
audio frequencies and then mixed with the signal from a
tuneable 'local oscillator' to translate the frequency into
the audible range.
Frequencies from 20 to 130 kHz are converted using a
high quality 'double balanced mixer' IC giving excellent
stability and low noise performance with low current
Power is provided from a 4x AAA battery (not supplied) Alkaline cells. The microphone is the latest Murata (Japanese) type, and the loudspeaker is a super low profile unit with a weatherproof Mylar cone. The circuit is constructed using surface mounted components and is compact stable and reliable.
This design is used by amateurs and professionals alike, and is earning a good reputation for performance, quality and reliability. Not just for Bats! The detector has been used and highly recommended for listening to ultrasound from Rats, and Crickets, (it also locates bicycle punctures very efficiently!) It is simple to use - even by absolute beginners.