What current and amperage needs to be supplied to the base of a transistor, is it possible to control an 8 amp

supply with 6ma applied to the base, is .7v a rule of thumb if so, how do i calculated the actual voltage needed?What current and amperage needs to be supplied to the base of a transistor, is it possible to control an 8 amp
I answered ';engineering'; too, but I'll take the two points.





While you will have to be careful selecting the transistor, but you should be able to find a darlington that will do it, there are ones available with gains of 2000 or even higher. Once you find one with the gain and current capacity you need, check the data sheet for the base-emitter voltage, for saturation it will be a little higher than 1.4V, but probably not by a lot.What current and amperage needs to be supplied to the base of a transistor, is it possible to control an 8 amp
I already answered this.








8 amp divided by 6ma is 1300.





It's current that controls, not voltage. %26lt;==== important





Transistor gains do not go that high (1300)





Even darlingtons will have trouble at that gain level, but you may be able to find one with a combined gain of the two stages equal to that number, although you need at least a gain of 2000 if you want saturation.





Darlingtons are two stages cascaded, so you need about 1.4 volts on the base.








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