available here: https://www.kitronik.co.uk/3548-3w-white-power-led-star.html
it works without one but gets way too hot.
I'm going to be powering this from a pc usb port or a wall plug charger if that matters.
This compact Micro USB Breakout Board offers an easy way of connecting circuits to the 5V power lines that a USB connection supplies. The output (5V and Gnd) connections are two large solder-able pads on the PCB.
This board is ideal for replacing batteries in a variety of circuits such as our Mono Amp kit. It is compatible with Micro USB chargers supplied with most mobile phones and tablets.
This product is designed and manufactured in the UK by Kitronik.
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