Last Updated on October 22, 2023 by Kevin Chen
Audio circuits are commonly associated with transistors. These are electronic components that are used for amplification of audio signals while at the same time serving as switches in the same circuits. Other than transistors, diodes are also heavily featured in the audio circuits. They perform different functions that are directly related in the overall functionality and the performance of the audio circuits. In this article, we are going to discuss in detail the key functions of diodes in audio circuits. You will also get some tips on how to choose the right diode for your audio circuit application.
Overview of the audio circuits
What is an audio circuit and how are they related to diodes? We can define an audio circuit as any type of circuit whose electric current is converted to audio signals. Whether the audio signals are input or output, as long as they are within an electric circuit then it qualifies to be known as an audio circuit.
Other than providing a path for the audio signals, these circuits are also involved in the manipulation of these signals. For example, the output audio signal will be higher and cleaner than the input signal. This could be mainly because of various processes such as filtering whereby the noise is removed from the circuit.
Another common signal-processing action in audio circuits is amplification. This is where the output signal is higher than the input that is getting into the circuit. Again, various electronic components are responsible for the signal amplification. While the transistor is the main component, diodes, and capacitors also play some roles.
Where are audio circuits found? As long as a device produces audio signals or sound, it must be having audio signals. So, think of mixers, amplifiers, equalizers, microphones, speakers, telecommunication devices, automotive audio devices, and security devices among others.
In each of these application areas, audio devices are designed to meet specific goals. For example, the circuits in most telecommunication should focus on filtering noise for voice clarity.
Using diodes to regulate signals
Signal regulation is among the essential functions of diodes in audio circuits. They are used at the maximum levels at which the audio circuits will resonate in the circuits. The nature of audio signals is that they are propagated in waves when being transmitted. These waves have defined amplitude and frequency.
When the signals exceed a particular amplitude and even frequency, they end up getting distorted. This is where the relevance of diodes comes in. They are installed in circuits to ensure that the signals don’t exceed those limits. This ensures that the signals remain smooth, a key factor that improves the quality of the output signals.
Regulation of power in audio circuits
Image source Freepik
Diodes not only regulate the signals but also determine the level of power in the audio circuits. Some key properties of diodes ensure that they can be used for regulating both the voltage and current in the circuits. They do this when combined with other active electronic components.
How do diodes regulate voltage in the audio circuits? They simply use the reverse characteristics of the pn junction to work as power regulators. In fact, there are specialized voltage regulator diodes that are installed in audio circuits to achieve this goal. When the reverse voltage of the diode is raised to a certain level, electric current will start flowing freely through the diode. This will continue uninterrupted until the diode attains breakdown voltage.
Protecting audio circuit components
Diodes are used in audio circuits to work as protective devices. They protect the circuit and other components that are in the circuit. The basic operation of a diode entails ensuring that current flows in one direction only and not the opposite direction. This property is utilized when designing audio circuits.
Diodes will be included in the circuit to ensure that electric current does not find its way in the undesired direction. This configuration ensures that sensitive electronic components in the circuit will not be affected by this current.
The protection functionality of diodes goes hand in hand with their regulation and even switching capabilities when deployed in audio circuits.
Diodes as switches in audio circuits
Just like transistors, diodes can be added to audio circuits to operate as switches. However, the two have different working mechanisms to implement the switch operation.
For a diode to be used as a switch, first, it has a rated voltage. Also, the diode is connected to the circuit in a forward bias mode. When the specified voltage exceeds a certain limit, the diode will be reverse-biased since the internal resistance of the diode will be high. When in the reverse bias mode, the diode will open the circuit hence stopping the flow of current in the circuit.
On the other hand, if the voltage in the circuit is below the operating voltage of the diode, there will be low resistance in the diode hence it will be forward-biased. In this state, the diode will act as a closed switch allowing current to flow freely in an audio circuit.
In short, the switching action of diodes is due to biasing. It can be forward-biased or reverse-biased. When you want to use a diode as a switch in the audio circuit, you should pay attention to its transient response. This is the time taken for a diode to change its biasing.
Are you building a product that will have an audio circuit? It is clear that diodes are among the electronic components that you should get for building your product. Whether the circuit will be used in the audio amplification audio filtering, audio mixing or any other application. Once you understand the requirements for your audio products and devices, you can go ahead to buy diodes that will work perfectly in the circuit.
When it comes to buying diodes for audio circuits, ensure that you buy from reputable diode suppliers in China. Other than supplying high-quality diodes for sale, you can also buy these electronic components such as diodes at affordable prices.
If you want to find more Electronic Components Distributors, please check out the following articles:
- The Art of Sourcing: How We Identify and Partner with Top IC Manufacturers - November 24, 2023
- Essential Electronics Test Equipment You Should Know About - November 24, 2023
- How To Finish PCBA Design Process Quickly? - November 24, 2023