Today I would like to share how to light up the LEDs by wireless power transmissions from a toothbrush charger and solenoid valve coils which were picked up from the scrapyard.

Before getting started, please watch the video below:

Step 1: PART LIST

The main components are as follows:

01pcs x toothbrush charger. My kid's toothbrush was damaged and only its charger is remained. Its specification: 220 - 240V~, 50 - 60Hz/ 1.3W.
01pcs x 24VDC solenoid valve coil. I had 2 set of valve coils which I picked up them in scrapyard.
02pcs x Resistor 1K.
20pcs x LED.

Step 2: SOLDERING

Firstly, before applying this testing, we should learn about wireless power transmission and how it works on google site or on this instructable page.

Soldering 2 resistors 1K at the valve coil terminals. My valve coils size are about (WxDxH) 22mm x 30mm x 30mm, capacity 1.7W and 3.0W. It is lucky that the valve coil's hole (diameter ~9mm) fits into the charging tower. See picture below:

Soldering the LED to these resistors. Because I had 2 valve coils, I soldered LEDs with 2 different shapes

Shape 1 with 4 LEDs, soldered to 1.7W valve coil.

Shape 2 with 12 LEDs, arranged in cylindrical form and soldered to 3.0W valve coil.

Finally, I glued all valve coil terminals. DONE!

Shape 1

Shape 2

Step 3: TESTING

The voltage measured at terminals of valve coil by multimeter is about 24VAC. In industrial field, some indicator light module are used at 24VAC / VDC and these module normally include: LEDs plus some resistors, for example: