I don't see how it is possible using just two wires and DC battery to ring two bells in separate offices, and the requirement that both bells must ring when the buttons (or whatever kind of switch) are activated by people in the other office.
For those who commented that it can be done, a circuit diagram or schematic would be of great help to me.
I don't see how it is possible using just two wires and DC battery to ring two bells in separate offices, and the requirement that both bells must ring when the buttons (or whatever kind of switch) are activated by people in the other office.
For those who commented that it can be done, a circuit diagram or schematic would be of great help to me.
The real challenge is "to do it in two wires" as if when three wires are used. Some users said it can be done but I cannot see how it is possible. It seems that the requirement that both bells should ring has been overlooked.
Of course it is possible to setup some form of communication at both ends but that's not a solution in the spirit of the original question. So telephones options are out.
Simple solution is to use AC power supply and diodes.
I didn't see that requirement in the original posting.
Unless both pushes are pressed and released within a split second of one another, the bells will ring - albeit briefly.
Does the original posting explicitly excluded the case that Office B cannot call Office A while Office A is ringing Office B and vice versa?...quote]
No, and it didn't specifically include that proviso, either. But I'll accept your point.
+--------+--------------------------------------------------+
----- | |
-- >switch >switch
----- | |
-- BELL BELL
+--------+--------------------------------------------------+
Office A Office B
+--------+--------------------------------------------------+
----- | |
-- >switch >switch
----- | |
-- BELL BELL
+--------+--------------------------------------------------+
Office A Office B