what is the theory behind amplifiers

[TomJ]

Thanks i think i am beginings to uderstand amps. have i got this right that in an amp because transistor dont give a linear increase in current you use resistor to counter this and give a more linear amplification

 

[traderbam]

[The first profesor of electronics told me that amplifer is from electrical point of view a "High quality imedance transformer"]

The lesson is, therefore, to never to ask a Professor a simple question.

 

[peranders]

The lesson is, therefore, to never to ask a Professor a simple question.

I asked my professor in semiconductor technology about these +- 14 Volts max gate voltage in the datasheets of 2SK135/2SJ50, what happens if I exceed the voltage?

I replied: I have never built anything....I only make them (he really made semiconductors of his own in his lab).

= never ask a professor about something practical!

(now I have the answer....)