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In order to check my son's learning level and stimulate his curiosity, I plan to assign him a DIY electronic project. If he can complete it by the weekend, I will reward him with a mountain bike. I found a tutorial online: https://www.avaq.com/technology/guide-to-build-a-high-performance-diy-audio-amplifier-with-the-2n5875-transistor Can an eighth grader complete it independently?

Seems quite complex to me, definitely too complex if it is the first circuit.

Breadboard circuits are preferable to start, since you don't lose the components by welding them and thus, you can easily modify the circuit if you make small mistake (even if you can still kill a component, though), since the components are inserted in the breadboard, not welded to the PCB.

I would recommand, instead, a Raspberry Pi or Arduino Uno kit (with extra components to play with the real world; note that a PC or MAC is required to program the MCU), if possible, since not only there are great introduction (with online tutorial) but can target multiple different projects. The cost may be a little bit higher than the project you mentionned (that project seems to require welding tools, generally not included in a DIY kit).

Also, after close inspection to the web page of the supplied link, it is not evident of what is included and what is not, if we look at the section "required components". And we don't have any schema of how to build the project either. (Maybe it is on another page, though.)

Thanks for your answers.

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Starting with a breadboard-based project would be more suitable, as it allows for easy modifications without soldering. Alternatively, kits like Arduino or Raspberry Pi offer beginner-friendly introductions to electronics with extensive online tutorials. These platforms provide a solid foundation and can lead to more complex projects over time. https://www.circuitlab.com/questions/q2562k7r/is-this-diy-electronics-project-appropriate-for-high-school/ snow rider

That project looks quite advanced for an eighth grader, especially if he’s new to electronics — it involves high-power components and detailed circuit work. He might need some guidance, but with interest and support, it could be a great learning experience! https://www.circuitlab.com/questions/q2562k7r/is-this-diy-electronics-project-appropriate-for-high-school/ solar smash

For an eighth grader, especially one who is new to electronics, that project appears fairly advanced because it includes intricate circuit work and high-power components. https://www.circuitlab.com/questions/q2562k7r/is-this-diy-electronics-project-appropriate-for-high-school/ speed stars