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how do you wire up two spst switches for a ingition box?
i have two switches both have three prongs. the first switch is http://www.radioshack.com/product/index.jsp?productId=2062493&cp=&sr=1&origkw=spst+toggle+switch&kw=spst+toggle+switch&parentPage=search
And the second is http://www.radioshack.com/product/index.jsp?productId=2103602&cp=&sr=1&origkw=rocker+switch&kw=rocker+switch&parentPage=search
the one with the safety cover on it has a light on it and i want both lights to work and i want the rocker switch to be first then i want the one with the cover. this is all going on a project box with i have . then from the cover to go out to the rocket or watever is on the other end. i have an led all ready to go and the holes are all drilled but i just don know who to wire it but so the lights will work and it will put the charge out. i want to be able to have a batt. hooked up so the first switch lights up than throw that and the secound one lights up, and i throw that and it goes.
please help i am so confused
Thanks
Wiring a model rock control uses two switches in series. The first switch serves as a master arm and locks out power to the circuit. The second switch (FIRE) when closed will send power down to the ignitor. When this second switch is opened there is a flash light bulb in parallel with the switch contach. This provides a continuity check through the ignitor with the buld limiting the current flow so as to prevent firing. Closing the fire switch shorts out the light buld and lets full current flow through the ignitor allowing it to warm up and trigger the rocket motor.
SAFETY.....
First you should use a key switch for the master arm and provide a second light which lights when the master arm switch is on ( THis light is in parallel and will always light when the system is armed) . The master arm key is supposed to be on a laynard and worn around your neck while you attach teh wires to teh rocket motor. (Also disconnect the car battery)
Second The guarded switch should be used for the fire button. It is best to use a (normally open) momentary push button so the fire button won't get accidentally left on.
Third: Its best to use separate flashlight lamps in dedicated holders instead of the built in illuminators.
Fourth. Is is best to have a seperate continuity test done with a second momentary pushbutton. The idea here is to limit the time current flows through the ignitor and prevent a gradual heating and accidental firing by leaving continuity test current flowing over a period of time.
About switches>>>
The SPDT (Single Pole Double Throw) rocker switches have three connections. the center is usually the common, which will complete a circuit with either of the other two connections depending on the direction the toggle(rocker) is thrown.
Usually the connection opposite the direction the toggle is thrown is the one that completes the circuit with the center common connection.
THE ONLY WAY TO BE ABSOLUTELY SURE..... is to do a continuity test with an Ohm meter or use a light bulb and battery to complete a circuit through two of the connections.
You want the guarded switch to be open when the cover is down. You also want to make sure that the switch guard is of the style that forces the switch OFF when closed. There are guards which allow you to lock the switch ON which you do not want...
Finally .... TEST the system by connecting a light bulb instead of a rocket ignitor and make sure you can only light the test bulb brightly when the fire button is pressed.
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