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since i have all most of the parts (lots of 2n2219 transistors, 7414 ic, resistors) i figured it might be worth while. then i noticed that it uses 2 different kinds of transistors. is this important or can i use the 2n2219 transistors in place of the 2n2905 transistors as well?
it uses 2 different kinds of transistors. is this important
They are either NPN or PNP transistors. The one with the arrow pointing away from the device is NPN, and the one where the arrow points towards the device is PNP. Just follow what is layed out on that diagram, or check out an H-Bridge IC, such as the L293D or the SN754410 (they are actually quad half H-bridges... aka dual H-bridges) that are good for controlling 2 motors.You can use two complementary transistors aswell.
Sorry about posting in a horrendously dead thread, but how would the circuit change if I used an IC, such as the L293D?
The transistors in the tutorial are obsolete,
and the IC seems like a simpler solution. I'm a mech person though, and still new to this electron magic electronics.
No they're still very current - used where you need a bit more current than eg. BC54x/BC55x can handle.