I have one of those, well, I got it from a friend who used to work at a =
big alarm/security company, it has an eeprom which stores 9 numbers =
which it calls in sequence, and then it "beeps" this special sequence, =
optionally you can have it send a pre-recorded msg to each phone number.
it's programmable from any phone, ie you hook it up to the line, and use =
your phone to program it with DTMF..
I never used it, I have manuals and everything for it, it looks rather =
simple


----- Original Message -----=20
From: "Jeszs" <jgonzalo@RECOL.ES>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, July 05, 2001 10:21 AM
Subject: [EE]: Telephone gyrator


> Hi everyone!
>=20
> Months ago I built a home alarm to call my mobile upon intruder =
detection.
>=20
> Main parts:
> - 16PIC84
> - MT8880: DTMF recognition and generation
> - 600 Ohm transformer to interface the phone line
>=20
> I had many difficulties to engage the line and send tones through it =
but finally I found the concept 'gyrator' and built one as per a web =
page recommendations.
>=20
> Today, summer in Spain, the machine is failing. Sometimes it works ok =
and sometimes my phone company operator says the dialled number is not =
correct.
>=20
> Do you know a 'standard' way to attach the line to the transformer and =
the transformer to the MT8880?
>=20
> Thank you very much in advance!
>=20
>=20
> --------------------
> Jes=FAs Gonzalo
> INSA, Ingenier=EDa y Servicios Aeroespaciales, SA
> Paseo Pintor Rosales 34
> Tel: +34-915489149
> 28008 Madrid (SPAIN)
> --------------------
> =FF=F8m=B6Y=FF=FF 0=FE~o-+-=FD=CA&?)=ED=FD:%y=AB=DE=B6=17=8F =
"=E2=B2=D9sS[h=FE~o-+-=FE=E9=EC=B9=BB=1C=AE&=DE=FE=B7=AA=B9=EB-=FEh=AD=BE=
f=FFs+=FF

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