Author Topic: DTMF chips from phones for remote control.  (Read 7616 times)

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Offline Handmixer.comTopic starter

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DTMF chips from phones for remote control.
« on: October 02, 2006, 12:12:20 AM »
I recently read a document on using the DTMF (Dual-Tone Multi-Frequency) chip from old cordless phones to make an eight to twelve channel remote control and I thought this sounded really cool, but I am not very good at removing ICs from PCBs, so I was wondering if anyone knew a better way to get them for almost no money?

Offline polar bear6

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Re: DTMF chips from phones for remote control.
« Reply #1 on: October 02, 2006, 10:03:36 AM »
where did you find that document, i would very much like to read it.

and removing stuff from PCB's can easily be done with a heat blow gun.
http://www.uchobby.com/Projects/ScroungingElectronicParts.htm

it would be really great if you could post a link to that document...

Offline Admin

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Re: DTMF chips from phones for remote control.
« Reply #2 on: October 02, 2006, 10:39:06 AM »
Those hot air guns are expensive (although I admit to having one), and it would probably be much easier and cheaper to just order the IC's you are looking for . . .

You could also physically cut the IC off the board (taking some of the board with it), and then solder to the leads.

Offline Handmixer.comTopic starter

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Re: DTMF chips from phones for remote control.
« Reply #3 on: October 02, 2006, 06:30:06 PM »
Polarbear6, I cannot recall where I found the document, but I will have another look for you.

Admin, thanks for the cutting idea, I had not ever thought of that!

Offline Handmixer.comTopic starter

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Re: DTMF chips from phones for remote control.
« Reply #4 on: October 02, 2006, 07:08:36 PM »
I found the page for you Polarbear6, here it is.

http://www.free-electronic-circuits.com/circuits/radio-remote-control-using-dtmf.html

Have fun.

 


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