Music Reactive LED project

Projects General Guidance
1

On this page:
https://create.arduino.cc/projecthub/buzzandy/music-reactive-led-strip-5645ed?ref=platform&ref_id=424_trending___&offset=117

It uses 5v led strip lights, then a 12v 1.5a power supply with a Transformer DC DC Step Down Voltage Reducer 12V to DC 5V 10A 50W dc.

Pardon my ignorance, but why use a 12v psu with a step down transformer if the led strip is 5volt. Why not just use a 5v power supply instead.

Thanks

2

I guess the person who built that project dug in his box of unused parts, found a 12V wall wart, hooked that up to a DC/DC converter he had in another pile of unused parts, and with that got the properly regulated 5V supply he needs. That's roughly what note 4 on that page tells as well.

3

Thanks, yes I realise that now, and if I do the same project, I have a 5v 10amp power supply I can use without having to buy a stepdown transformer. Also, I wouldn't need the 7806BT 6V regulator.

I already have a sparkfun sound detector and 10K var resistor, or a 10k pot in my case