In this instructable I will show you how to make a simple PBX system. It is useful for talking between different rooms.
You will need:
An old telephone cable
300 Ω resistor
A small project box
9v battery holder
Step 1: Strip the Wire
Take the old phone cord and carefully remove a bit of the insulation in the middle. Then cut the red wire and strip both ends
Step 2: Soldering
Solder on wire of the 9v battery holder to the one of the red wires on the telephone cord. Then solder a 300 Ω resistor to the battery holder and the other red wire. Cover the exposed connections with electrical tape.
Step 3: We Have Power
Power the device with a 9v battery and then mount the electronics into a small project box.
Step 4: Connection Methods
Because of the one odd connection on the end of the PBX we need a way to make it plug into telephone N.O. 2. To do this there are several ways. Here are two:
1. Connect the PBX to a telephone splitter
2. Use an adapter
You should be able to see by looking at the pictures.
Step 5: All Done
You can now use your micro PBX system. Thanks for reading!