Electronics > Beginners
BJT transistor question.
davelectronic:
Might seem obvious, but I've got an application where a BJT transistor has little room for B E C wiring. Well base and collector wire diameter, the collector affords more room, and i can use a larger conductor wire. My question is, can the base and emitter wires be less diameter conductor, as the collector carries the current to the load ? I'm thinking the base junction conductor could be, but not certain about the emitter junction conductor.
Any thoughts help appreciated.
Thanks.
Nerull:
Current doesn't magically appear in the transistor. What flows out or in through one pin must flow out or in through another. Where does the current at the collector go?
mcovington:
The emitter current is similar to the collector current.
Kirill V.:
The emitter current is the sum of the base current and collector current. Since the base current is often very small, it is neglected in calculations, but it still exists.
The transistor does not generate electrical energy - it only controls the flow of energy coming from the power supply. Because through transistor passes the flow of energy (this current) then this the flow of should enter through some pin and then withdraw through the other pin. The control current must also pass through the two pins. Therefore, the current of one of the pins of the transistor is always strictly greater than the current of the other two pins.
The same conclusions can be shown with KCL, it does not matter.
EEEnthusiast:
When in saturation, the base current can increase drastically, unless limited by a suitable current limiter. If this is accounted for, then only the base wire can be thinner. Collector current and emitter current shall be very nearly equal while the transistor is in the linear region.
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