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I started using 5mm LEDs (as I mentioned in my intro), they don't work well at all taped down and will only light up 3 max using a 3v battery, and even then they're not so reliable. SMDs are tricky to use but are worth it, students much prefer them too because 3V will get at least 7 SMDs lit.If you're working with under 12s I can see that they may not suit you so try https://store.chibitronics.com/collections/all/products/red-yellow-and-blue-megapack-circuit-stickers
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Thanks for the instructable - I made it with 10 LEDs in parallel. Couldn't get it working with a phone though, not enough power I presume - any advice to adapt for phone use would be appreciated.I also got the "speaker" version working with the LM386 (following the circuit diagram and using .5W, 8Ohm speaker and trying out different resistor values) but it would only pick up loud sounds spoken directly into the speaker - again, any advice to improve sensitivity would be appreciated.I
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Thanks to Travomatic's edits! I made it with a pair of 2W speakers! Delighted!
Thanks so much for including the line numbers of the changes you made - I missed one and got an unrelated error message and was totally flummoxed!!
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