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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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    Model rocket igniters are made with wires made from nichrome, or were when I was a kid.  The electric burner on a stove is made out of the stuff AFIK.  It is 50/50 nickel and chrome.  Hard, low corrosive and high bulk resistivity for a metal.  So it is used in heating elements.  When drawn into wire it has a rather definite ohms/foot.  Back in the old days it was also used to make model locos smoke by heating up some stuff.

     

    SCRs and TRIACs are devices that can be turned on (sorta) like a transistor but cannot be turned off by their control terminals.  You could google them.

     

    The ADJ terminal is like a signal input.  The OUTPUT terminal will source (or sink, depending) current in an attempt to keep it 1.2V above ground.  So, for example, if we jumped ADJ to GND, the pass Q would turn all of the way on.

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  • 0

    Model rocket igniters are made with wires made from nichrome, or were when I was a kid.  The electric burner on a stove is made out of the stuff AFIK.  It is 50/50 nickel and chrome.  Hard, low corrosive and high bulk resistivity for a metal.  So it is used in heating elements.  When drawn into wire it has a rather definite ohms/foot.  Back in the old days it was also used to make model locos smoke by heating up some stuff.

     

    SCRs and TRIACs are devices that can be turned on (sorta) like a transistor but cannot be turned off by their control terminals.  You could google them.

     

    The ADJ terminal is like a signal input.  The OUTPUT terminal will source (or sink, depending) current in an attempt to keep it 1.2V above ground.  So, for example, if we jumped ADJ to GND, the pass Q would turn all of the way on.

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