Think of it this way...
In your house you have light switches, the light switches are connected to a circuit breaker. If everything is of then there is no light, if you turn the light switch on there is still no light as the cicuit breaker is off.
Now, if you turn the circuit breaker on, there is no light but if you then turn the light switch on then the light will come on.
Simple idea for a 20 cue firing pannel, get 1 key switch, 20 push button switches, 20 speaker connectors (type that you push and it opens so you can insert a wire then realease and it holds onto the wire), and a power source.. battery and a long lenght of 12 pair cable (24 wires inside) and 2 box's.
Mount the key switch and all the push button switches on one box and mount all the speaker connectors on the other box.
From the (-) side of the battery, connect 1 wire, the same wire connect to every black connector on the back of the speaker connectors.
Now connect every wire (1 wire) to each of the red sides on the speaker connectors and the opposite end of each of the wires onto one side of each of the push button switches. (not the wires used to the (-) side of the battery and you will also have 3 spair)
When this is done, connect a wire from the (+) side of the battery to one side of the key switch, connect another wire from the other side of the key switch to every push button switch.
Now when you turn the key switch, it allows power to one side of the push buttons but not up to the speaker connectors, if you push any of the buttons now it will allow the power to travel to the speaker connector and fire the attached device(s).
This is very a basic system. you can add in bits to do continuity tests and little LED's so you can see which buttons are active etc.
Edited by The_Djinn, 15 July 2004 - 08:07 AM.