Wiktor Wise
In electrical circuits, a zigzag pattern is used to represent resistors, which reduce current flow. In a circuit diagram, resistors are universally denoted by zigzag lines. A zigzag pattern on a PCB board is used to add a delay, and it can also act as a fuse in case of a short circuit.
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What You'll Learn
Zigzags in electrical circuits can indicate resistors
In electrical circuits, zigzags are used to denote resistors, which reduce the current flow in the circuit. This is one of the most commonly used symbols in circuit diagramming, and electrical engineering students are advised to familiarise themselves with it.
The zigzag symbol is not to be confused with the transistor symbol, which indicates amplification or switches of power. Transistors are different from resistors and come in three major types: bipolar junction transistors (BJTs), junction gate field-effect transistors (JFETs), and metal oxide semiconductor field-effect transistors (MOSFETs).
In some cases, a zigzag pattern on a PCB board may also be used to indicate a delay, ensuring that two high-speed differential traces are the same length for phase (time delay) matching.
Additionally, a zigzag pattern can indicate an intentionally weak trace, acting as a fuse in case of a short circuit. This is done to comply with standards and ensure that the fault is cleared without sustained arcing or the emission of flames or molten metal. While some may consider it a bad design, it is a common practice to include a weak point for short-circuit protection.
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They can act as fuses in the event of a short circuit
In electrical circuits, zigzags are used to represent resistors, which work to reduce the current flow in a circuit. In the event of a short circuit, these zigzags can act as fuses.
A zigzag pattern on a PCB board can indicate an intentionally weak trace, designed to act as a fuse in the event of a short circuit. This is often a requirement for standards compliance, ensuring that faults are cleared without sustained arcing or the emission of flames or molten metal.
The weak trace serves as a sacrificial element, breaking the circuit connection and interrupting the flow of electricity. This prevents potential damage to other components in the circuit and helps to contain the issue.
While some may consider this a subpar design choice, it is a common practice to introduce a weak point specifically for short-circuit protection. This intentional weakness is strategically placed to ensure compliance and safety.
In the context of circuit diagrams, the zigzag symbol is a universally recognised representation of a resistor, a fundamental component in electrical circuits. These zigzags are a visual reminder of the resistor's function to introduce resistance and control current flow within the circuit.
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They can be used to add a time delay
In electrical circuits, a zigzag pattern can be used to represent resistors, which are denoted by zigzag lines in circuit diagrams. Resistors are components that reduce or limit the flow of current in a circuit.
Now, onto the topic of time delays in electrical circuits:
In some cases, a zigzag pattern on a PCB (printed circuit board) may be used to introduce a time delay. This is achieved by ensuring that two high-speed differential traces are of the same length, allowing for phase (time) delay matching. This means that the electrical signals travelling through the traces will take the same amount of time to propagate, ensuring synchronization and proper timing in the circuit.
The zigzag pattern helps achieve this delay by physically lengthening the traces. By adding bends or zigzags, the traces can be made longer within the limited space on the PCB. This technique can be especially useful when precise timing is required, such as in high-speed or timing-critical applications.
It's worth noting that while the zigzag pattern can add a time delay, its primary purpose is often not just to introduce a delay but to ensure that the traces are of equal length for proper synchronization. This design consideration is crucial in ensuring the reliable operation of the circuit and can help prevent issues caused by timing discrepancies.
While the zigzag pattern can serve a functional purpose, as mentioned earlier, it can also act as a visual reminder or indicator of the presence of something unique or important about that specific trace in the overall circuit design. This visual distinctiveness can be beneficial during redesign, reproduction, or repair work, providing a clear indication of special considerations or requirements.
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They can indicate a DC adapter
A zigzag pattern in an electrical circuit diagram is a symbol with a specific function and meaning. In circuit diagrams, zigzag lines are used to represent resistors, which reduce the current flow in a circuit.
Now, onto the topic of DC adapters. A DC adapter is a device that converts alternating current (AC) to direct current (DC), and it is used to power a variety of electronic devices, such as laptops, phones, and other consumer electronics. In the context of DC adapters, the zigzag pattern serves a specific purpose:
Firstly, the zigzag pattern can indicate an intentionally weak trace within the DC adapter's circuit. This weak trace acts as a fuse in case of a short circuit, particularly if the bridge rectifier fails. In compliance testing, the bridge rectifier is intentionally shorted out, and the presence of the weak trace ensures that the fault clears without sustained arcing, flames, or molten metal. This design is a standard practice to meet safety requirements, despite some criticism about its effectiveness.
Secondly, the zigzag pattern on a DC adapter can be used to match the phases of two high-speed differential traces. This pattern adds a slight delay, ensuring that the traces have the same length for phase (time delay) matching. This aspect of the zigzag pattern contributes to the proper functioning of the DC adapter by ensuring that the traces are synchronised and aligned in their time delays.
The zigzag pattern on a DC adapter, therefore, serves multiple purposes. It acts as a safety measure to handle short circuits and also ensures the proper functioning of the adapter by matching the phases of high-speed differential traces. While there may be variations in design and implementation, the zigzag symbol in electrical circuits, specifically in the context of DC adapters, plays a crucial role in indicating these functions.
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They can be used to indicate something special about the trace
In electrical circuits, a zigzag pattern can be used to indicate something special about the trace. This pattern is often used as a visual reminder that the trace is important for the overall design. It serves as a distinct marker that there is something unique about that particular trace, which may be crucial for anyone redesigning, reproducing, or repairing the circuit.
The zigzag pattern can be intentionally designed as a weak trace. While some may argue that a straight, thin trace could serve the same purpose, the zigzag pattern is used to indicate that the trace is meant to act as a fuse. In the event of a short circuit, the intentionally weak trace will fail first, clearing the fault and preventing sustained arcing, flames, or molten metal emissions. This is an important safety measure to ensure that the circuit complies with standards and passes compliance testing.
In some cases, the zigzag pattern may be used to add a slight delay to the circuit. This can be observed in high-speed differential traces, where the zigzag pattern helps ensure that the traces are the same length for phase (time delay) matching. This technique is not commonly seen, but it can be an effective way to introduce a small delay in the circuit.
The use of the zigzag pattern as a visual indicator is especially helpful when other methods of communication, such as silkscreen or notes attached to the schematics, may be costly or easily overlooked during the PCB layout process. By incorporating the zigzag pattern directly into the trace, important information about the circuit's design and functionality is conveyed in a clear and hard-to-miss manner.
It is important to note that while the zigzag pattern can provide valuable information about the trace, it is just one aspect of the circuit design. Electrical engineers must consider various factors and symbols to fully understand the circuit's functionality and ensure it meets the required standards and safety measures.
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Frequently asked questions
A zigzag in an electrical circuit diagram usually represents a resistor, which reduces the current flow in the circuit.
The zigzags in a DC adapter are intentionally weak traces meant to act as fuses if the bridge rectifier fails due to a short circuit.
The use of zigzags is a way to comply with standards that require a mechanism to clear faults in the event of a short circuit.
In some cases, zigzags may be used on old CPU motherboard circuits to ensure that two high-speed differential traces are the same length for phase (time delay) matching.
Some people have expressed distrust or concerns about the design of using zigzags as a fuse. There may be a risk of interruption being too slow, and the traces being too large for effective fuse functionality.
