heyy,
i'm a final year electronics and communication student doing a project on party line system, telephone conferencing equipment.
i am looking for dtmf decoder circuits ...........i already have a circuit that uses a mt8870b(dtmf decoder) ic along with shift registers n compators.but i'm lookin for more smaller circuits for my designs.
also i'm lookin for circuits that do on hook - off hook detection for telephone instruments.
i'm a final year electronics and communication student doing a project on party line system, telephone conferencing equipment.
i am looking for dtmf decoder circuits ...........i already have a circuit that uses a mt8870b(dtmf decoder) ic along with shift registers n compators.but i'm lookin for more smaller circuits for my designs.
also i'm lookin for circuits that do on hook - off hook detection for telephone instruments.