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How to wire a transistor?

nschreiber0813

Dear: Element 14

Hello it is me Noah again as you may remember me from my last post I am trying to build an arduino rocket controller and I am at prototyping stage. First of all you should know that I am using transistors BD712 which a pnp transistor that I need to amplify a current. The reason I need it to amplify a current is because I need it to increase 5V to 7.5V and to then send the current to my fixed barrier terminal blocks where it will then detonate the rocket motors. You see first of all in order you need a base resistor that connects to ground. The reason you need that is to prevent the board from short circuiting. I have placed several base resistors at several points and according to wikipedia I think I am doing this right. It says on wikipedia that I should do this.

NPN_common_emitter.svg

And this is what I did.

image

Please can you help me because I am not even sure what a transistor is?

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    It would be useful to know how much current you would need to actuate an ignitior, and if they melt open when actuated.  If this is the case, you could use a thrystor.

     

    In the more general case of having to actuate a solenoid in the Ampere regime,  usually the best thing to do is not to use a transistor, but rather to trick a linear voltage regulator into becoming a switch.  This way you get the advantage of its thermal and overload protection, which would be a PITA to implement with discretes.

  • 0 in reply to D_Hersey

    Dear: Don Hersey

    How do detonate an ignitor because I thought it doesn't matter the voltage as long as it is not incredibly high. Also you said that I could use a thystor, what is a thrystor; do you mean thruster. You also said "In the more general case of having to actuate a solenoid in the Ampere regime,  usually the best thing to do is not to use a transistor, but rather to trick a linear voltage regulator into becoming a switch." but I have no idea what solenoid and ampere regime is or how to trick a linear voltage regulator into becoming a switch. And you said thermal overload protection but I have no idea what that means. Could you answer those for me?

    From: Noah

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  • 0 in reply to D_Hersey

    Dear: Don Hersey

    How do detonate an ignitor because I thought it doesn't matter the voltage as long as it is not incredibly high. Also you said that I could use a thystor, what is a thrystor; do you mean thruster. You also said "In the more general case of having to actuate a solenoid in the Ampere regime,  usually the best thing to do is not to use a transistor, but rather to trick a linear voltage regulator into becoming a switch." but I have no idea what solenoid and ampere regime is or how to trick a linear voltage regulator into becoming a switch. And you said thermal overload protection but I have no idea what that means. Could you answer those for me?

    From: Noah

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