Aaron's Homepage Forum
Aaron's Homepage Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 Electronics
 Telephone
 remote telephone switch

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize:
UserName:
Password:
Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List
   
Message:

* HTML is OFF
* Forum Code is ON
Smilies
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Clown [:o)]
Black Eye [B)] Eight Ball [8] Frown [:(] Shy [8)]
Shocked [:0] Angry [:(!] Dead [xx(] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

   Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG)
   

T O P I C    R E V I E W
woody Posted - Dec 23 2007 : 9:44:24 PM
Is there a circuit (or premade part) that can be jacked into a home telephone line that will silently monitor the line. If a PIN number is detected, close a low voltage switch, if no PIN number dected, do nothing ???
1   L A T E S T    R E P L I E S    (Newest First)
Aaron Cake Posted - Dec 28 2007 : 09:44:07 AM
Probably, yes.

It would be a simple matter of an off-the-shelf DTMF decoder IC, and either a simple microcontroller or an IC like used in this circuit:
http://www.aaroncake.net/circuits/combolock.asp

Aaron's Homepage Forum © 1995-2020 AARONCAKE.NET Go To Top Of Page
This page was generated in 0.05 seconds. Snitz Forums 2000