Ohm meter and ground is added to run simulator - not part of working circuit. An old telephone headset with 600 ohms speakers ( the 600 ohm resistors) is used in this project. Sound powered kitchen to basement or kitchen to garage range. If twisting two connecting wires together for neater look allow necessary extra length. Connect wires to same terminal on each headphone. You alternate talking and listening over system. Separate buzzer if to be used as phone system.
Might help mom keeping ear on her kids or by your bed so you can greet who is breaking in your garage? Simple trick to save steps for handicapped, ext.
