because in forward connection the internal field is in a direction of the main current so the current passes
while in the backward connection it is reversed so no current passes
The capacitor is used to block DC bias from the output, so that only the AC signal is passed. In an audio amplifier, for instance, unwanted DC in the output would cause distortion when fed to a speaker, or could even damage the speaker or amplifier. In the case of interstage capacitors, they block DC so that the output of the first stage does not affect the bias of the second stage.
the diode is forward bias ANSWER: A bypass diode is used to bypass circuitry as soon as the diode is forward bias by 0.6 volts The use it to bypass to prevent damage to the circuitry
The purpose of biasing an amplifier is to shift its operating point, so that when you apply a signal in you will get a expected signal out. The operating point is generally in the middle of the linear region. You would not use AC for the bias, as that would cause the operating point to constantly shift, and you would then not be able to differentiate between the signal and the bias.
halfwave rectifier converts ac to pulsating dc.in half wave rectifier we use only one diode.during forward bias condition the circuit is open and hence conducts hence we get +ve half cycles where in reverse bias condition the circuit is open and hence doesn't conducts.
the use of swamping resisters in amplifier is in order to protect the amplifier from high temperatures
You can not have bias in these matters. You have to be clear.
You use a thermocouple as the input to the amplifier circuit.
You will have signal degradation unless you use the amplifier.
yes an electro acoustic guitar needs an amplifier as the pick mounted underneath the bridge can only act as a microphone, to get the sound amplified a user should use amplifier for the accurate bass and tone.
I think Amplifier is use for direct signal or D.C signal & the main function of amplifier is to make that signal sharp(powerful) so that a microprocesser process it.
Biasing is used in a transistor amplifier circuit in order to place the transistor as nearly as possible in the center of its linear region. Transistors have cutoff, linear, and saturation regions. Too little bias current, and you enter cutoff - Too much, and you saturate. Both conditions cause distortion when you attempt to use the transistor as an amplifier, as opposed to a switch.
Bias is a permanent voltage, applied to the input of an amplifier device, in order to make it work in the correct area of an amplification curve. Valves (thermionic tubes) and semiconductors (transistors) both use bias in their grid or base connection. A negative swing in the input could put the control input below the working of the device and cause it to switch off. This is undesirable as it will show as distortion. The bias raises the zero point, so that the signal will not turn the device off.