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Date: Mon, 9 Jan 2012 10:19:03 -0800
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Inexpensive Chirper
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On Sun, 8 Jan 2012 10:41:00 -0500
Rob Butts <r DOT butts2 AT gmail DOT com> wrote:

> I need a chirper much like the standard chirp you hear when
> someone locks their car doors via the remote.  For actuall
> chirpers on mouser and dgikey they are more than $20.  Ideally,
> I'd like to operate it at a max of 6 volts. Does anyone know of
> any cheaper?

No idea on ready-made products, but if you are interested in making
your own (might be a fun experiment), here are some resources you
could consider:

- Electronic Chirping Canary Circuit 
  <http://skema-elektronik.blogspot.com/2011/06/electronic-chirping-canary-circuit.html>.

- Automated alarm circuits
  <http://pecworld.zxq.net/Assets/SOURCE/PDF_fun_circuit/All_pdf_files_manual/34_Feb09.pdf>
  (PDF document).

- Canary chirp generator
  <http://circuit.presstoday.net/2011/07/schematic-canary-chirp-generator.html>.

I know the “alarm armed” chirp sound that many car alarms use.  It
may be a “linear chirp” or “exponential chirp”, a signal of
rising frequency, which the Wikipedia page Chirp describes.
<http://en.wikipedia.org/wiki/Chirp>

I hope this is helpful.

Regards,
Colin