2026-06-17 (W) SubdermalDuino No good power transmission method for the ESP32

I thought the overheating receiver boards could be tamed by using a smaller transmitter. The coil was the largest I could find, and it was driven by 20V. I had a smaller transmitter and soldered a USB connector so I could power it with 5V. When I connected it, the board became overheated, and the driver chip was so hot that it melted the solder and fell off. I checked the polarity, and it was fine, so I tried a second transmitter, and it worked wonderfully. I tried powering the ESP32 demo board, and the light came on, but it was not transmitting Bluetooth. I carefully aligned the coils so they had maximum overlap, and transmitter and receiver temperatures spiked, but I briefly saw the name in the Bluetooth list. I will try some different 5V receivers to find one that does not overheat when unloaded, or switch back to the nRF52840.

Power light, but no connection

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2026-06-16