Comments on: Build a simple bat detector

By: Eliot

Eliot — Tue, 05 Aug 2008 06:04:31 +0000

@miked sorry about that. Every so often the via gets lost. I added it to the post.

By: miked

miked — Tue, 05 Aug 2008 04:43:13 +0000

come on now! i found the bat detector and posted on 7/31.

http://onlyhacks.com/2008/07/31/diy-bat-detector/

if you are going to copy at least give some credit.

By: Alex Dodge

Alex Dodge — Tue, 05 Aug 2008 03:31:01 +0000

Watching the video first, I thought it was processing sonar into a visual display.

Reality is a bit of a letdown.

By: Wolf

Wolf — Tue, 05 Aug 2008 03:28:12 +0000

This was up on miked’s onlyhacks.com a couple of days ago…

lol

By: jimmys

jimmys — Tue, 05 Aug 2008 01:34:27 +0000

I just built one of the 'enhanced' models about a week ago. very simple but very capable. I'll probably end up adding variable resistors for gain and a multi position switch for the different frequency divisions but the design works well without them.

I'm not a big fan of the earphone/power switch trick, though. It's a neat idea but if I leave my headphones on when I plug in, I get a loud pop which is annoying.

I haven't had it long enough to have detected any actual bats but there's been enough things that emit ultrasonic frequencies to keep me amused. I'm wondering if it might be useful as a crude diagnostic device to listen to capacitors charging.

By: Scott

Scott — Tue, 05 Aug 2008 01:33:26 +0000

Just the thing for constructing a bat detector van.

"How much did you pay for this?"
"Sixty quid, and eight for the fruit-bat."

By: zish

zish — Tue, 05 Aug 2008 01:25:58 +0000

It'd be more fun to have a "bat pranker". I can just picture several output channels, each with a speaker placed around the yard. Our listener waits for bat signals, and echoes back the signal from any number of the channels at random.
The bat would be all like, WTF!?
And I'd be like hahaha!
Then the bat would be like FU!
Then he'd give me rabies.

By: BigD145

BigD145 — Tue, 05 Aug 2008 00:48:11 +0000

damn. i just stick my head out the door. if a bat is doing the sonar bounce off my head, i hear it.