Taidacent 5V Receiving Wireless Inductive Coil Wireless Charging Transmitter and Receiver Modules Wireless Charging Power Supply Module Induction Charging Module(5V1A)

This wireless power transfer kit turned out to be the perfect, contact-free solution for my hobby project, the world's first Nixie tube propeller clock. The coils are mounted on the component side of prototyping boards (with parallel traces on the other side, which cause no issues with the power transfer). The coils are approximately 8 mm from each other, which is the recommended distance. I ran some additional measurements, and found that in this configuration, the voltage begins to break down at around 400 mA of load current (my circuit only needs 140 mA, so I have more than enough margin), and the short current is 800 mA (but that is through the ammeter, which itself drops about 0.5 V). I also found that the coils allow an axis misalignment of up to 10 mm before the voltage starts breaking down at the 140 mA load.

Don't buy these, they transmit pitifully low power and will not charge a phone.

No issue on this item and works perfectly and easy to install on my project.

I got these to power a small portable device. They work ok but you need to get the loops very close and then the power transfer is minimal. I needed to charge the battery much quicker than these were able to so I switched to a USB connection.

Where are the instructions? Cheap product!

Need to deliver power to something that spins? Want to make your own wireless charger? Need totally disconnected power for any reason? This is the kit for you. It’s a fairly compact, low power kit, with absolutely no instructions. The only info is what’s on this seller’s page, namely 5-12V supply and up to 1 amp transmitted power at 5V.However, I’ll tell you the smaller board is the “input” or “transmitter” in which you supply your power. The larger board is the “output” or the “receiver” which receives the transmitted power. The only clue to this is that the larger board says “out” on it, near the red/black wires.I tested it quickly using a 9v battery and an LED, and it worked like a charm. I got good power transfer up to about a 1cm separation distance before the LED brightness visibly dropped off. I was also able to misalign the coils by up to 50% before I got visible power drop off. I didn’t do a ton of exact measurements, but with the 9V battery, the coil idles at about 60mA. When transferring power to this particular circuit, it increased to about 80mA (LED + 1k ohm). So far, it works great, and I’m very excited to build it into a real project. 5 Stars!

While it's true these coils can transmit SOME power at 20mm, it's a tiny fraction of what they're rated at. I had to have the coils within 1mm to get good power transmission, and even then the best I could manage was 0.354 mA at 4.82 volts - well below the advertised 1000 mA at 5 volts.There's also no documentation provided, not even any indication of which board is which. The longer one is the receiver.

It works well for low power applications, but with the coils 3mm apart, the maximum it can deliver is half an amp, and the voltage drops to 4.3V at that current.