Learning outcomes part 8A

• a transistor (npn) can be used as an amplifier.

• a small base current will control a larger collector current and that this is the basis of amplification.

• the base current is large enough, the transistor behaves as a switch such that the current in the collector can be turned on and off.

• a transistor can be used as an oscillator to generate audio and radio frequencies.

• Know the difference between a crystal oscillator and a variable frequency oscillator (VFO) based on a tuned circuit.