need ideas,suffestions and advices on this project: listening device for bird watching

having the following specification:1.handheld,battery operated.2.frequency operation in audible frequency range.3.minimum of 30bB signal amplication.4.volume control for final outout stage.5.automatic gain control.6.10 second recording of sound,non volatile storade.7.two output sockets for headsets,5mm jack plug sockets.8.5 hour operational capabilities on one set of batteries.9.On/Off switch with LED indication.10.LEd to indicate recording.11.LED to indicate playback

Five minutes at Radio Shack and you should be able to find a parabolic microphone and a cheap digital audio recorder.
abrinah (author)  DELETED_GuardianFox7 years ago
i have to design that circuit.need its circuit,hardware n software.its my project project.
Re-design8 years ago
Look at this piece of equipment.
http://www.defensedevices.com/big-ear-parabolic-dish.html
THen either buy one (price is right) and modify it where it is lacking or build yourself one from scratch.

I don't think Radio shack carries one anymore. But they do carry lots of stuff you could use to build you own.

You could use an old satelite dish for the reflector as a starting point. Drill a hole in the middle for a length of threaded rod and put a high gain mike on the end of that so you could move it in and out to focus the sound. And pick a battery op. amp that has high enough gain ... and so on an so on.

good luck.
abrinah (author)  Re-design7 years ago
i have to design that circuit.need its circuit,hardware n software.its my project project.