Franzis Bat Detector Electronic Kit

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Quoting product code: N38DP


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About this product


  • Create your own bat detector kit
  • Build and solder a device to detect high frequencies
  • Learn about bats, echolocation, frequencies and electronics

Product overview

• Create your own bat detector kit
• Build and solder a device to detect high frequencies
• Learn about bats, echolocation, frequencies and electronics
• Includes 17 components to play and learn with
• Suitable for ages 14+ with adult supervision
• Requires one 9V (PP3) battery (sold separately, Order Code L46AL)

How can I find bats with the detector?
Build your own bat detector with this kit complete with detailed instructions. The kit becomes a high quality ultrasonic detector that lets you hear the bats you’re looking for. Everything you need is in the box which becomes the outer case for your detector. With 17 parts this is a fun project to make and use.

What does this teach?
Bats may not be blind but in the dark it becomes harder to see anything coming so bats use a type of echolocation to help them navigate. Echolocation is made up of soundwaves on a frequency too high for the human ear to hear as we only hear up to around 20kHz. Bats can produce calls at 40kHz or higher depending on species. The Franzis bat detector can transform these unheard frequencies into audible sound letting you hear where the bats are coming from. Other things such as electronics also give off sounds that are audible on similar frequencies - listen and see what you can hear.

How do I put it together?
Learn electronics and try your hand at soldering. Most of the components are already attached to the board, there are just a couple of components and connections to solder. Use the capacitors, resistor, potentiometers, microphones, speakers and more to create your detector. The detector had two knobs on the front - one controls the frequency which you use to find the specific frequency the bats are calling at and the other controls the volume of the speakers. This kit requires one 9V battery (sold separately, Order Code L46AL).

Rated 3 out of 5 by from no sure some quality parts bought this bat detector building kit yesterday from maplins it was sent free delivery it arrived today very quick i was impressed.till i saw a cardboard box inside parcel it put me off a bit as this was to become the main box but to my surprise the rest of components looked good i put everything together but in a plastic box i had it took 3 hrs to complete and works great iam very good in electronics but to the ordinary person putting this together its a bit far i think a plastic box should be put to the kit instead of that cardboard thing......
Date published: 2015-08-14
Rated 5 out of 5 by from Impressed! Bought this kit not expecting great quality for the money but works excellent,easy to build ,took about an hour and a half,found bats within the first half hour of trying it,clear signal, would recommend.
Date published: 2015-07-31
Rated 5 out of 5 by from Bat detector - success Bought this for an 8-year old grandson. He was not keen to learn to solder, so I did the necessary (fairly simple) soldering of wire connections myself. Detector works fine. So far have only come across pipistrelles. The big advantage of the detector is that it warns you when bats are present and greatly increases the chances of actually spotting them in flight. Used successfully on a number of occasions.
Date published: 2016-09-02
Rated 5 out of 5 by from best bat finder! Bought one for myself and was so impressed I bought more, as presents for mature offspring. If one can handle one's own instrument soldering iron, the kit is complete and simple, with excellent instructions. And it actually works! Note: needs a PP3 nine-fold battery.☺
Date published: 2016-08-19
Rated 5 out of 5 by from Wonderful! It took about half an hour to make and it works perfectly. I haven't tried it on bats yet as it is winter but it picks up the sound of me gently rubbing a finger and thumb together from twenty feet and the sound of a pin dropping is awesome!
Date published: 2016-01-10
Rated 5 out of 5 by from Bat Detector This works very well, the only downside is that it's a cardboard box and so will not last, so I will convert a smaller waterproof box at some stage. It would appear to detect bats going away as well as coming toward you.
Date published: 2017-03-20
Rated 1 out of 5 by from No sound at all Spent an evening checking and double checking the construction. Can't find any thing I did wrong, but can't get a peep out of the thing. A lot of effort and with solder best part of thirty quid for no result at all
Date published: 2015-07-11
Rated 4 out of 5 by from Recommend This is no harder than a kids glue it model airplane kit. Took my time and checked a few soldering vids on you tube . Working first test.
Date published: 2017-06-07
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Number of included parts 17
Number of models that can be made 1
What can be made? bat detector
Computer system requirements N/A
Age group, if specified 14+
Power supply requirements 1 x 9 V (PP3) battery (not included)
Dimensions 110 mm x 16 mm x 30 mm

What frequencies does this pick up and can you tune to different frequencies for different species?

Asked by: Pete
This service is for frequently asked questions and does not allow two way communication, In order for us to best assist you with your technical issue please contact us on the details below: 0333 400 9500 or email
Answered by: Billy
Date published: 2017-05-04

I'm looking at this kit to use as part of a Science experiment in a school. We would like to build something to leave around the school overnight to record any sounds rather than listen in real time. Is it possible with this device? Thanks.

Asked by: L Dormand
I am sorry but the item in question does not support use in your intended application.
Answered by: Dominic
Date published: 2017-06-16
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