need help building a radio remote control using DTMF

[umarsani]

i have the schematics and components of making the remote control that will control 4 devices using DTMF as the control codes. (circuit at **broken link removed** the transmitter consists of a DTMF generator (IC UM91214B) and an fm transmitter.
i just couldnt find that IC anywhere, i please would like to know if the IC tp5089 could replace it,since it is also a DTMF generator.kindly assist if you can.thank you

 

[Nigel Goodwin]

No idea, but DTMF remote control is an incredibly old and outdated technique, try looking up the Holtek remote control IC's (or use a PIC to do it).