J
JSW
Guest
Does anybody know where I can find a circuit to build a phone dialer for my
home alarm?
Cheers
JOHN
home alarm?
Cheers
JOHN
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Uncle Wobbly
Guest
Mitel do some very useful chips... check out the 88xx series of DTMF
transcievers. They are really easy to interface to.
I used the 8888 & later the 8885 in a call router controlled by a PIC
worked absolutely brilliantly.
You would need a 600R 1:1 matching transformer and a small relay in series
across the telephone line to provide the loop and carry audio.
"JSW" <jswilko@hotmail.com> wrote in message
news:bekg9a$uf3$1@news6.svr.pol.co.uk...
transcievers. They are really easy to interface to.
I used the 8888 & later the 8885 in a call router controlled by a PIC
worked absolutely brilliantly.
You would need a 600R 1:1 matching transformer and a small relay in series
across the telephone line to provide the loop and carry audio.
"JSW" <jswilko@hotmail.com> wrote in message
news:bekg9a$uf3$1@news6.svr.pol.co.uk...
Does anybody know where I can find a circuit to build a phone dialer for
my
home alarm?
Cheers
JOHN
D
Dan Fraser
Guest
Radio Shack sells one for $100.00. Never waste time building what you
can buy off the shelf for a tolerable price.
On the other hand, I'm prototyping a DSP for a pro audio system but then
we will be selling 100 a month of them. if not more.
--
Dan Fraser
From Costa Mesa in sunny California
949-631-7535 Cell 714-420-7535
Check out my electronic schematics site at:
http://www.schematicsforfree.com
If you are into cars check out www.roadsters.com
can buy off the shelf for a tolerable price.
On the other hand, I'm prototyping a DSP for a pro audio system but then
we will be selling 100 a month of them. if not more.
--
Dan Fraser
From Costa Mesa in sunny California
949-631-7535 Cell 714-420-7535
Check out my electronic schematics site at:
http://www.schematicsforfree.com
If you are into cars check out www.roadsters.com