Hello all, I'm new to the forums, but I've been watching Dave's videos for quite some time.
Anyway, I have an LED aquarium light fixture that I am modifying to add a dimming fixture. It draws 20W and uses two transformers capable of passing that power to the LEDs. The first transformer is 120VAC to 120VAC, which I assume is for isolation, but I'd love to know more if anyone has ideas. The voltage is rectified and fed into a constant current LED driver that generates it's own low voltage power rail, and switches the rectified voltage through an additional transformer with a feedback coil to power the LEDs.
Both of these transformers are capable of passing at least 20VA through them. And they are both tiny, on the order of 2-3 CM^3 in volume.
I've searched and searched, but I cannot find anything similar on Digi-Key, Mouser, or other suppliers. The power transformers I find there are all 500g, and 10CM^3 or larger for that kind of power. Does anyone know where I can find a small transformer off the shelf? Thanks!