Based on your search query, I recommend using Whimsical for teaching about circuit boards.

Whimsical is a digital workspace that provides a range of tools such as flowcharts, wireframes, mind maps, and sticky notes. These tools can be particularly useful for visually representing the structure and function of circuit boards.

Here's how Whimsical can address your needs:

• Visualizing Concepts: You can use Whimsical's flowcharts to break down and visualize the components of a circuit board, aiding in comprehension and retention. This can be particularly useful when explaining complex concepts like how electricity flows through a circuit board.

• Interactive Learning: Whimsical's real-time collaboration feature allows students to work together on a single document. This can be used for group projects where students are tasked with designing their own circuit boards.

• Feedback and Revision: You can provide feedback directly on students' work in Whimsical, making the revision process more efficient. This can be particularly useful when students are designing their own circuit boards and need guidance on how to improve their designs.

• Text-to-Flowchart feature: This tool allows users to translate their ideas into flowcharts in seconds. It can be used to create user flows, share process flows and concepts, and guide thinking to find solutions. This feature can be used to quickly create diagrams of circuit boards.

Remember, Whimsical is free of charge for educational use, making it a cost-effective tool for your classroom.