This inductive charging set comes with a squarish transmitter board with two chips, powered by 9V. The longer board serves as the output. You can connect it to the part of your project that needs power. Inductive charging lets you power a device without direct wires, just like in a rechargeable electric toothbrush. When the input half is powered with 9V - 12VDC, the output half provides a 5V DC output. You can draw up to ~500mA if the coils are 2 - 3 mm apart. For 100 - 200mA, the coils can be up to 7mm apart, and for 10mA, they can be up to 12.5mm apart. Any non - ferrous/non - conductive material like air, wood, or plastic can be used between the coils without affecting distance or efficiency. However, the coils need to be co - axial for best power transfer. As it's an air - core transformer, it's about 40% efficient. There's a quiescent current of about 70mA at all times. These basic modules could be used for low - cost toys. Advanced users can change the output voltage to 3.3V by soldering different resistors on the output side.
Using this inductive charging set is easy. First, power the squarish transmitter board with 9V. Then, connect the longer output board to the part of your project that needs power. Make sure the coils on the two boards are fairly co - axial and parallel for the best power transfer. You can adjust the distance between the coils based on how much current you need. If you need a large current, keep the coils closer. For smaller currents, you can increase the distance. Note that the charger is an air - core transformer, so it's not very efficient. There will always be a quiescent current of about 70mA. When it comes to maintenance, there isn't much to do as these are basic modules. But if you're an advanced user and want to change the output voltage, you can solder different resistors on the output side. Just be careful when handling the soldering equipment.
