HF LED Power Accessories

Community Projects
151

I caved and bought an expensive RF Mosfet in a TO-220 package (I want this first revision to be DIY friendly). The model I bought was the MRF101AN from NXP. I made a nice little protoboard version using the schematic I posted earlier:

IMG_20201005_002906489
IMG_20201005_0029064894000×3000 2.83 MB

Here’s the updated schematic with values for the components on the right side:

xLED_PowerBracelet
xLED_PowerBracelet922×599 49.9 KB

I verified that the Pierce Oscillator outputs a 13.56MHz waveform. It has a pk-pk amplitude around 1.3V. That’s not enough, though. The RF mosfet has a minimum Vgs of 1.7V and a nominal Vgs of 2.2V. I stole the Pierce oscillator design because I haven’t biased a BJT in a while, and I certainly never did it with series diodes :dizzy_face:. If anybody has any insight how I can reconfigure the Pierce Oscillator circuit to allow a greater Vgs across the mosfet, I’m all ears.