A: Vacuum tubes are current amplifiers transistors are voltage amplifier. The voltage drop across the collector resistor causes amplification since very little current in the base will change a large current in the collector.
a transistor ampify the current i.e. you the output current proportional to the input one. in CE amplifier , this ratio is more than one Ic/Ib = current amplification factor this extra ampitude comes from the biasing batteries used.
typically the amplification of a transistor 100 times.
amplification
It depends on what you want to do with the transistor. Class A, common emitter, is used for voltage amplification. Class C, common collector, is used for current amplification. There are other classes and configurations but, again, it depends on what you want to do.
I don't know about hfc, but hFE is the amplification factor by which the transistor amplifies the base current. Therefore, if hFE is 100, the base current is amplified by a factor of 100.
To increase the amplification of a single transistor microphone amplifier, you can adjust the resistor values in the circuit, particularly the emitter resistor and the load resistor. Increasing the resistor values can enhance the gain, while ensuring that the transistor remains in its active region. Additionally, using a transistor with a higher current gain (β) or optimizing the power supply voltage can also boost amplification. Lastly, consider adding a feedback network to stabilize and control the gain effectively.
amplification
Magnetic amplifiers and vacuum tubes don't need transistors to amplificate electricity current. You can get a transistor by two oppositely connected diodes.
An AS162 transistor is a type of PNP transistor commonly made of germanium. This is an older kind of transistor that was often found in power amplification circuits.
Transistor action relies on the recombination and transport of charge carriers across the base region. If the base width tends to zero, the movement of carriers becomes too rapid, leading to insufficient time for recombination to occur, which is essential for the transistor's amplification properties. Consequently, the device behaves more like a diode, losing its ability to control current effectively, and thus, transistor action is lost.
A base resistor is essential in a transistor circuit to limit the current flowing into the base terminal of the transistor. This prevents excessive current that could damage the transistor or lead to unintended operation. Additionally, the resistor helps establish the correct biasing conditions, ensuring the transistor operates in the desired region (cutoff, active, or saturation) for optimal performance in amplification or switching applications.
The transition frequency of a transistor is the frequency in which the transistor will no longer provide any amplification or gain output. The frequency is out of the transistors's range.