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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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  • 0 in reply to nschreiber0813

    Well, just that you could use a SCR (for example) rather than a transistor as a power switch if the iginiters normally melt through.  It is a small matter.  NVM.  With a transistor, you have to turn off the current.  The thyristor version would keep juicin' 'til the filament melted.  You would probably want to throw a fuse in series with the load just-in-case the load didn't melt through for some reason.  Depends how your igniter works.  Some just heat up and ignite chemicals that the nichrome has been dipped in and don't melt through.  If you really wanted to dump tons of energy into the igniters, you could get a charge pumper and make a circuit like the one used to fire a photographic strobe.  Again, NVM.  These ideas just add more complexity than they are worth for a non-expert.  I was just musing.  Nowadays you would have trouble finding someone who could bias a MOSFET, much less know what an SCR is.