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The capacitor is there to block any dc voltage that might be applied to the input terminal, which could cause damage or upset the biassing if it was allowed through to the base.
Shaun Lehner
Wiki User
∙ 15y agoCapacitors are used to couple each stage of an amplifier to the next, to help remove ripple voltages from rectified AC power supplies and they are also used to tune circuits to get the required frequency response, such as a tone control in an audio amplifier, or an RF or IF amplifier in a radio receiver front-end. Capacitors are also used to bypass emitter resistors to improve the voltage swing and lower the AC output impedance of class A amplifier stages, and also used in negative feedback loops to stabilize an amplifier's open-loop gain.
Wiki User
∙ 13y agoA coupling capacitor is used in amplifiers, at input, output, or between stages, to allow the signal to pass while blocking any DC bias that might be present. Not using a capacitor in this case can upset the bias, i.e. operating point, of the amplifier.
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Can you use semiconductor as a capacitor?
Transistor either increases or decreases current.. Capacitor stores energy
What should be the value of capacitor at transistor amplifier circuit input?
at full input, if the transistor is working, the value of capacitor will be 0.
Is a transistor a small electronic switch?
A transistor is used to switch electronic signals.
Why capacitor is used before UM66 in circuit for melody generator?
We used capacitor in UM66 because capacitors are used to store the energy, and hence when we press the switch it will charged the capacitor and energy stored in it, and after releasing the switch it releases the energy. So, we can use the capacitor to store the energy.
Why you use capacitor before connecting transtitor?
Before connecting to the transistor we use a capacitor becausefor the transistor to amplify we should first apply DC biasing so that we can set an operating point to itso once the transistor is biased DC currents flow in the whole circuitryAll the AC signal source are shorts to the DC currents so we employ capacitor for two reasons1.As capacitor blocks DC and allows AC it is connected for not moving the DC operating point of the transistor and making it fixed since if any small DC part arises in the signal it leads to the change of operating point and our amplification procees gets affected2.To block the already present DC currents in the circuitry for not getting away and making it fixed
Can you use semiconductor as a capacitor?
Transistor either increases or decreases current.. Capacitor stores energy
What is the difference between capacitor and transistor?
transistor either increase or decrease current bt capacitor stores the energy
What should be the value of capacitor at transistor amplifier circuit input?
at full input, if the transistor is working, the value of capacitor will be 0.
How do you set up an RC circuit that will keep a 12V lamp on for 4 seconds after depressing the switch?
Use a transistor to drive a small relay. When the switch is pressed it should turn on the transistor and at the same time charge a small capacitor. Discharge the capacitor over 4 second time period with a resistor. You will have to experiment with resistors to find one that gives an acceptable discharge rate. Note, if the 12V lamp is running DC you can drive it directly with the transistor and forget about the relay.
Resistor and capacitor built circuit for alarm switch?
I wanna use resistor , capacitor and amplifier 7173 for switch alarm circuit. How can i choice resistor and capacitor value because i wanna use 24V DC.
DC blocking in a transistor is achieved by?
Including a series capacitor in the input and/or output circuit of the transistor. If the capacitor in the output circuit is omitted there will be a dc component in the output.
Is a transistor a small electronic switch?
A transistor is used to switch electronic signals.
What is use of bipolar junction transistor?
amplifier, switch, oscillator, etc.
What does a time activated switch use?
A time activated switch could use pneumatics or an resistor capacitor circuit.
How transistor helps to pass dc across capacitor?
It doesn't.
What are components in smart chip?
capacitor,transistor,resistor,inductor
Function of resistor capacitor and transistor on integrated circuit?
resistor
