Dtmf

[mytech]

Plz suggest me..
Using which IC can i built DTMF control of equipments via RF?..
If you have any circuit ideas plz let me know..
Thanks.

 

[Nigel Goodwin]

You're going back 30 odd years, things have moved on a LOT since those primative days!.

 

[audioguru]

Since today you can buy a DTMF phone for less than the cost of its DTMF generator IC, you can't buy the IC anymore.

I haven't seen a DTMF decoder IC for about 30 years.

 

[RadioRon]

Have a look through the chips from this company.
**broken link removed**

 

[eblc1388]

I haven't seen a DTMF decoder IC for about 30 years.

The MT8870 is still very popular.

For the DTMF generator (like the Philips PCD3311C), in order to survive, now include selection between I2C or parallel data input, modem tone generating and even two octave musical note generation. A bit of music while waiting on the phone line for all those "valuable customers".

One chip for all.

 

[Gayan Soyza]

UM91214B (Tone Generator) & MT8870 (Decoder) is a good match pair unfortunately they are out of date.
But still available in some areas.The UM91214B is more than 15$ & the other is 0.6$.
The circuits are in their data sheets.

 

[mytech]

You're going back 30 odd years, things have moved on a LOT since those primative days!.

Thanks a lot to all...
Actually i wanted to control devices around 10 using 4 digit password for security purpose via wireless...
I deciede DTMF , If you say this an old technique suggest me present tech.
I am little unawareness in this case.
Thanks...

 

[Nigel Goodwin]

Thanks a lot to all...
Actually i wanted to control devices around 10 using 4 digit password for security purpose via wireless...
I deciede DTMF , If you say this an old technique suggest me present tech.
I am little unawareness in this case.
Thanks...

Check my PIC tutorials, you simply transmit a digital code with one PIC and the receiving PIC decodes and does what's required. It GREATLY simplifies both ends of the system, and adds much greater flexibility.