if u want to use it as switch,put 4.7 K ohm to collector and 1K to baseI used transistor as switch In the basis I put a resistorHow I calculate the resistor so that don't burn the transistor
Assuming you are using the transistor in the common-emitter configuration then I would suggest you read this AAC ebook material on common-emitters to get familiar with this configuration.I used transistor as switch. In the basis I put a resistor. How I calculate the resistor so that don't burn the transistor.
But he wishes to operate the transistor in the saturation region.β depends upon the transistor. In the transistor you provided in the specs, they say that it can go from a β of 120 to 700. You can choose the β within those values, and it represents the gain of the transistor.
Well, β_min=120; Ic=10mA So:So how can β be helpful in the saturation region?
I simply assume that β will not drop below 120. And then for Rb<Rc/β_min BJT must be saturated.If they're both true, then how could you use β when using the BJT as a switch?
According to Fig. 4, that's quite the transistor. The collector current ranges from 1 amp to 1000 amps!Look here at figure 4
But without Rc, you can not get IB = IC/10. So you cannot saturate the bjt without Rc (Re).
Almost every little American transistor like the 2N3904 and 2N4401 has a spec'd max Collector-Emitter Saturation Voltage when the base current is 1/10th the collector current. Its spec'd beta is much higher than only 10.Hey Audioguru,
Could you please give an example of a datasheet which shows that when IB = IC/10, the BJT is saturated?
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