Common PCB design mistakes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a common mistake related to component placement on a PCB?

Placing components too close together can cause soldering problems and make troubleshooting difficult.

beginner

Why is poor trace routing a frequent PCB design error?

Poor trace routing can cause signal interference, increased resistance, and can affect the overall performance of the circuit.

intermediate

What mistake involves ignoring power and ground planes in PCB design?

Not using proper power and ground planes can lead to noise issues and unstable voltage levels in the circuit.

intermediate

How can incorrect drill hole sizes affect a PCB?

Using wrong drill hole sizes can cause poor mechanical fit for components and unreliable electrical connections.

beginner

What is the risk of not following design rules for spacing and clearance?

Ignoring spacing and clearance rules can cause short circuits and manufacturing defects.

What happens if components are placed too close on a PCB?

A Power consumption decreases

B The PCB becomes cheaper to produce

C Signal speed increases

D Soldering becomes difficult and troubleshooting is harder

Placing components too close can cause solder bridges and makes it hard to fix issues.

Why is proper trace routing important in PCB design?

A To reduce signal interference and resistance

B To increase the size of the PCB

C To make the PCB heavier

D To avoid using ground planes

Good trace routing helps signals travel cleanly and reduces electrical problems.

What is a consequence of not using power and ground planes correctly?

A Lower manufacturing cost

B Faster signal transmission

C Noise and unstable voltage levels

D Better mechanical strength

Power and ground planes stabilize voltage and reduce noise in circuits.

Incorrect drill hole sizes can cause:

A Poor mechanical fit and unreliable connections

B Faster assembly

C Improved signal quality

D Lower power consumption

Drill holes that are too big or small affect component mounting and electrical contact.

Ignoring spacing and clearance rules may lead to:

A Improved signal speed

B Short circuits and manufacturing defects

C Reduced PCB size

D Better heat dissipation

Proper spacing prevents electrical shorts and helps manufacturing quality.

List three common mistakes made during PCB component placement and explain why they cause problems.

Think about how placement affects soldering, troubleshooting, and heat.

Explain why power and ground planes are important in PCB design and what issues arise if they are not used properly.

Consider how electricity flows and how noise affects circuits.