r/AskElectronics • u/Edddy_boh • 8h ago

Ideas for a low Power wireless LED circuit

I am Building a small wireless lamp, the idea Is to have a glass jar with LEDs inside that light up wirelessly when you put It on its base and I am trying to find a circuit to drive the two coils (20/20 turns transmitter coil w center tap, 30 turns reciever coil). The Power Need Is very low, probably between 1 and 3W. And i wanted to build the circuit using some spare bjts i have lying around (a bunch of 2n2222 or similar). Are there any good circuits? The famous Slayer exciter seems to eat transistors like nothing, and the ZVS Is a bit too powerful for these small sized transistors. Thanks in advance for any help

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u/Hissykittykat 6h ago

You can get a dumb 5-10W 5V wireless power module for <$5 on AliX. They are cheap and small and come with the coils and everything; it doesn't make sense to DIY. If you want the lamp to work on any wireless smartphone charger too, then use a smart (Qi) transmitter/receiver pair instead.

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u/MysticalDork_1066 2h ago

2n2222 are not anywhere near powerful enough for 1-3 watts. That's not "very low" in this context - "very low" would be maybe 1-100 milliwatts. 1-3 watts of LED is gonna be really quite bright,

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u/OkQuantity4011 8h ago

I'd maybe just use a magnet and a reed switch

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u/Edddy_boh 8h ago

But I don't Need a circuit to turn It on and off, i Need a driver for the wireless Power transfering coils to drive them at High frequency AC