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.If the positive AND the negative cycles are clipped the same amount then the level is too high, not the biasing
For a single transistor:
If the positive AND the negative cycles are clipped the same amount then the level is too high, not the biasing.
If a transistor is biased too high or is biased too low then one cycle will be clipped more than the other cycle.
If you bias it to work in a normal circuit, then you want to bias it so that the transistor works at some particular operating point which you deem to be a good operating point
For operation in what is called the 'linear' range'
The data sheet will often show a range of collector to emitter voltage ratings; Vceo, Vcer, Vcex, Vce sus, and all these parameters are for the maximum voltage between collector and emitter
If the positive AND the negative cycles are clipped the same amount then the level of the AC signal is too high, not the biasing.Level? you mean DC offset voltage is too high?
The output transistors of a push-pull audio amplifier have their idle current biased a little in class-AB to avoid crossover distortion.What about for a push pull , like a power amp?
A class-B amplifier has OFF TIME which causes crossover distortion so it is not used for audio or video.When biasing a push pull , the zero crossing has the transistors OFF TIME
The trimpot adjusts the amount of class-AB idle current to eliminate crossover distortion. The idle current is fairly low.This is also biasing: Not sure what the name is for this type of biasing:
There is trim pots which i don't know what the name's are, but they adjust the GAP of the push pull OFF TIME , so the GAP Transistors OFF TIME between the positive and negative cycles
If the positive AND the negative cycles are clipped the same amount then the level of the AC signal is too high, not the biasing.
Do you mean the Peak to Peak AC voltage going INTO the power amp stage is getting Clipped before the power amps input
But why don't they buy transistors that are allowed the higher voltage instead?
The power transistors don't get shorted or open from the over voltage on VCC, the transistors will DROP in output gain and power, that's when they know the transistor is damaged.
Bench checking them after they been damaged, it doesn't test shorted or open, because the breakdown voltage has been broken down
Because they're CHEAP.But why don't they buy transistors that are allowed the higher voltage instead?
The Techs, use a Meter that measures the Voltage to Current = Power output
Do you know what kind of meter this is?
It's for measuring Power transistors in power amps I guess to know how much Voltage to Current RATIO = Power output