Should music play from the device as we can't seem to get anything other than a buzzing when connected to the music box and the speaker?

Yes the music will play from the speakers as long as the circuit is configured correctly and tuned to pick the radio signal.

Can I get spare parts? I need switch 15 and the bulb light

These are supplied under various manufacturers names and most come from China. The parts required might be available from one of these companies. The other road to try is to go to an electronics store, take the parts and they might be able to help.

How many experiments can you make with this?

The book has loads in it - with explanations of what is happening (there is one where the light shouldn't come on - so do look at the explanations as you go) and kids can experiment with creating their own circuits too.

Product Dimensions	33.02 x 22.86 x 4.32 cm; 748 g
Manufacturer recommended age	8 years and up
Item model number	EKIT335
Educational Objective(s)	Creative Skills, STEM
Language:	English
Number of Game Players	1
Assembly Required	Yes
Batteries Required?	No
Batteries included?	No
tech_spec_battery_description_toys	Alkaline
Material Type(s)	Plastic and Copper
Remote Control Included?	No
ASIN	B06XMYPFTP

335 circuits toy

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