Low voltage (5V) RGB LED ripple projector with remote control.04:33

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Published on October 23, 2017

I think this is the first ripple projector of this type that I’ve come across that is low voltage. It runs on a 5V power supply and is unusual in that there is a very small number of fixed colours, and the motor is also speed controllable from the remote. The main advantage of the remote speed control is that the motor appears to be pulse width modulated, which means it starts and runs stably at low speed.

At first i thought it was driving the LEDs quite hard (no heatsink compound), but a lot of the power is actually dissipated by the resistors in series with the LEDs, which is also why the fan fires right onto the PCB too. The low voltage operation is a novel twist on this unit, and with a suitable lead it can run off a USB power bank. Sadly there is no memory function, so you need to adjust it to the desired effect every time you turn it on.

When the unit was left running for a while it got modestly warm, but not excessively so.

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