Bertrik's bat detector page

These pages describe my efforts in building a so-called bat detector, a device that is capable of converting the ultrasonic sounds emitted by bats to sounds that humans can hear. This web page contains mostly technical information; for general information on bats please take a look at my bat links.

Updates:
12/16/2006: Updated links
7/28/2005: Merged 'buying a bat detector page' into this page. Removed some old out-of-date pages.
6/12/2005: Added link to Yasushi Sugimoto's page
5/01/2005: Updated links to frequency division circuits
6/22/2004: Updated links

Site map for my bat detector pages

This is a list of all pages on my bat detector web site. Some of the links point to external websites.

General

• Photos of some Dutch bats
• Bat sounds and call analysis
• Bat detector articles list
• Bat links
• Bat detector calibration

How a bat detector works

• Functional break-down
  • microphone
  • pre-amp
  • frequency converter
  • power-amp

Bat detector plans

• Heterodyne
  
  • Electronics page of Yasushi Sugimoto which includes some bat detector designs.
  • Heterodyne detectors BD16913 and BD4066 by Cosy MUTO (JH5ESM).
  • Another heterodyne detector from Japan.
  • À l'écoute des chauves-souris, Daniel Dufour's bat page that shows a layout for a TCA440 heterodyne bat detector.
  • Jim leviston's Bat page, featuring an 'ultrasonic-to-RF' converter.
  • The New Jersey Society for Amateur Scientist has a bat detector as their summer 2000 project (with a schematic!). They also have a circuit for an ultrasound generator that simulates a simple bat call.
  • Michael Schmidt's Fledermausdetektor (in pdf format)
  • Tjerk Schuringa's heterodyne detector (local copy)
  • Peter Stimpson's D.I.Y. Bat detector
  • My own Enhanced TCA440 detector
  • My own NE612 heterodyne detector
• Frequency division
  • Frequency division detector with LED output by Thomas Scarborough
  • simple frequency division bat detector from the 2000 year group of HND1 Electrical and Electronic Engineering at the University of Northumbria
  • Scott Mitchell's Cylindric Ultrasonic Bat Detector
  • Chris Eve's Bat Detector Circuit
  • Frequency division detector by Archilochus
  • Frequency division detector by a group of Danish students, at Thomas Søhus' page
  • Tony Messina's Simple bat detector
  • My own frequency division detector

Buying a bat detector

• Bat detectors kits
  
  • Tony Messina has a Bat Shop.
  • Cees' vleermuizen pagina
  • The Maplin bat detector kit qlt85.
  • Magenta kit 861 Mk.2 Bat Detector
  • The Transtronics Ultrasonic translator SK-207.
• Ready-built bat detectors
  
  • Ciel Electronique sells affordable heterodyne detectors.
  • Affordable bat detectors from Armin Lenk.
  • Pettersson Elektronik AB has lots of bat detectors.
  • BVL Von Laar sells various kinds of bat detectors.
  • Tranquility II from David J. Bale
  • The Anabat system from Titley electronics.
  • Stag electronics (Bat box III).
  • The Noldus information technology Ultravox.
  • Ultra sound advice sells bat detectors.

Circuit ideas

• Microphone ideas
  • Detuning a piezo-electric microphone
  • High-voltage generators for electrostatic microphones
• Heterodyne detector ideas
  • Oscillators and mixers
  • Frequency display
• Frequency division ideas
  • Simple amplitude retaining division detector
  • Advanced amplitude retaining division detector

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Last update: October 18th, 2006

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