12-03-2017, 12:38 PM
What NM has done is to dive into the complicated science and he has taken everything as equal on something like a single stage amplifier.
When a theoretical scientist shows all the calculations he or she will show everything including things what we can easily ignore.
Take the voltage between the base and emitter on a transistor and add the effect temperature has on it.
We usually see a resistive biasing arrangement with ordinary resistors with 5% tolerance and right away you have picked up an error that is greater than the change due to temperature. If you are not making a lab grade thermometer it can be ignored.
You have to go through the whole lot and cycle the maths adjusting one figure at a time to see how much the result varies and then it will reveal what we can ignore and what is important.
Many of the calculations were made before the transistors were sealed into cans and this means that some of the figures were based on the dimensions of the bit of silicon that has now been hidden never to be seen again.
When a theoretical scientist shows all the calculations he or she will show everything including things what we can easily ignore.
Take the voltage between the base and emitter on a transistor and add the effect temperature has on it.
We usually see a resistive biasing arrangement with ordinary resistors with 5% tolerance and right away you have picked up an error that is greater than the change due to temperature. If you are not making a lab grade thermometer it can be ignored.
You have to go through the whole lot and cycle the maths adjusting one figure at a time to see how much the result varies and then it will reveal what we can ignore and what is important.
Many of the calculations were made before the transistors were sealed into cans and this means that some of the figures were based on the dimensions of the bit of silicon that has now been hidden never to be seen again.
