Most intercoms use up to five wires for hooking up to other units,while the one presented here needs just two.There are several features that make this design unique.
The 8 ohm speakers is used if two units are used.For four,each speaker must be a 16 ohm type.The microphone is the usual tape recorder type.A suitable power supply is given in schematic b.
- Two wire line systems.
- Single chip design
- Touch to call facility
- Hands free conversation which allows conferencing
- Compact design
The 8 ohm speakers is used if two units are used.For four,each speaker must be a 16 ohm type.The microphone is the usual tape recorder type.A suitable power supply is given in schematic b.
Schematic a :This intercom needs just two outgoing wires
while most others would need at least five.
Schematic b :The power supply set up
The final wiring is done as shown in Picture As for enclosures,even cases will do the job well enough.
Picture : Wiring Schematic for two units.
