Hi E
Please clairify?
thanks
Clarifying!
In your circuit, you have 40mA Base current into Q2, which is switching a load current of only 85mA, you have an assumed saturation Gain in Q2 of 2.??
In Q1 Base you have 0.22mA, with a collector current of 40mA, an assumed saturation Gain of 200.??
If you check the voltage on Q1 collector you will see it is 5.5Volts, its not saturated and it dissipates 0.22Watts when its ON.
Its a good rule to assume a saturation gain of ~10 to 15.
Where will you find 130R, 1k3, 19.1k and 191k resistors.???
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