Understanding the Output Voltage of a Transistor Circuit with a Zener Diode

In summary, the conversation discusses a circuit with an input voltage of 18V DC and a sinusoidal component with a 6V amplitude, and a zener diode with a 4.3V rating. The question is to describe the output voltage, and the person asking for help has spent three hours trying to find a solution. The response suggests finding the node voltages for three cases: minimum, maximum, and 18V input. Additionally, the person is advised to consider what will happen if the output voltage is above or below 5V, assuming Vbe = 0.7V.
  • #1
cpburris
Gold Member
38
4

Homework Statement



https://www.circuitlab.com/circuit/8ekkzw/dfsgadsfgdafgh/

For the circuit, suppose that the input voltage V_in is a superposition of 18 V DC and a sinusoidal component with a 6 V amplitude (thus the input voltage varies between 12 V and 24 V). Diode D1 is a 4.3 V zener diode. Describe the output voltage V_out.

The Attempt at a Solution


[/B]
Spent three hours already trying to figure it out, but I am just not getting anywhere.
 
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  • #2
cpburris said:

Homework Statement



https://www.circuitlab.com/circuit/8ekkzw/dfsgadsfgdafgh/

For the circuit, suppose that the input voltage V_in is a superposition of 18 V DC and a sinusoidal component with a 6 V amplitude (thus the input voltage varies between 12 V and 24 V). Diode D1 is a 4.3 V zener diode. Describe the output voltage V_out.

The Attempt at a Solution


[/B]
Spent three hours already trying to figure it out, but I am just not getting anywhere.

We need more work from you before we can be of much help. Show us what all the node voltages are for 3 cases -- Vin = min, Vin = max, Vin = 18V...
 
  • #3
cpburris: Ask yourself two questions:

1) What will happen if Vout > 5V ?

2) What will happen if Vout < 5V ?

( Assuming that Vbe = 0.7V ).
 
Last edited:

1. What is a transistor circuit?

A transistor circuit is a type of electronic circuit that uses transistors as the main component to control the flow of current. Transistors are semiconductor devices that can amplify or switch electronic signals, making them a fundamental building block in many electronic devices.

2. What are some common problems with transistor circuits?

Some common problems with transistor circuits include overheating, voltage drop, and incorrect wiring. These issues can lead to circuit failure and can be caused by factors such as inadequate cooling, excessive current, and incorrect component values.

3. How can I troubleshoot a transistor circuit problem?

To troubleshoot a transistor circuit problem, start by checking the power supply and making sure it is providing the correct voltage. Then, check all connections and ensure they are secure and in the correct order. If the circuit is still not functioning properly, test each component individually to identify any faulty parts.

4. How can I prevent transistor circuit problems?

To prevent transistor circuit problems, it is important to properly design and build the circuit, following the specifications and guidelines provided by the manufacturer. It is also important to use components that are suitable for the circuit and to provide adequate cooling for the transistors to avoid overheating.

5. What are some common applications of transistor circuits?

Transistor circuits have a wide range of applications in electronic devices, including amplifiers, radios, computers, and power supplies. They are also commonly used in digital logic circuits, such as in microprocessors and memory chips.

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