Mobile line compatible DTMF relay control project made by arranging the fixed line DTMF relay control project of my @ETE teacher. ULN2004 for relay driver used CM8880 IC for DTMF receiver installed on circuit PIC16F628 microcontroller. It has Proteus... Electronics Projects, Mobile DTMF Relay Control Circuit "microchip projects, microcontroller projects, pic16f628 projects, " Date 2021/03/30