CW Rig. Part 4 - Initial Class E Amplifier Experiments 

Only saw this as its pretty late at night. Definitely gonna take a look at this video later

Charlie - Great work! I am in the same mode here with papers in hand. I decided to just use the Sokal formulas and an old 2 dollar 2SC2078 Bipolar CB transistor. Wow is all I can say. I designed for 10W out at 15 VDC. My circuit is just as drawn in the paper with a 10 Ohm R target. I used a 1:4 UNUN that got me up towards 50 Ohms then a filtered as you did on the tail end. 91% efficiency with zero optimization, and right on the nose at 10W out. Increasing VCC to 20V gave me 18W out with only a slight impact on efficiency.

Some of the most interesting content is from people who don't present themselves as experts. I really appreciate the way you talk through your idea, theory, design, implementation and results. Most importantly, even when the results are imperfect.

a man who knows how little he knows, knows a great deal more than one who thinks he knows how much he knows Another great video Charlie!

I appreciate the tutorial (even though you don't think it is) and demo. I'm designing a 2nd iteration of a Class E Amplifier but with 13.56 MHz. I already have a buck converter made up to boost the sine wave signal using Vcc 1V - 24V.

Hello!Nice work! But your gate driver ciruit works well until 1MHz.Some weeks ago I had made simple shortwave transmitter. Output stage was push-pull.There was two IRLML0040. This transistor has a low gate charge - 3nC. IRF520 has a gate chage 16nC. Gain of BJT has been follen at high frequency.For example - 2N3904 has Beta=100 at DC.But when we have frequency 5MHz - this parameter will be goughly 10..15. We can have a fast swtching of output mosfet - to prevent heat losses (the mosfet will be work in linear mode with long rise and fall time). The best way to improve your device - using low stage gate driver IC.

Thanks a lot Charlie. Appreciate the comment as to why you shoot in 720 as well - understood.

Excellent description and demo, thank you. But if I heard you correctly, DC input power is about 4 W and RF output is 2 W so not as efficient as expected. More like class C.

I am new to Class E, why you use sine wave as input for simulation, but the square wave as input in experiment? what is the difference between them?

Hi Charlie，I see the filter inductors with cors in this PCB, how do you select them under 3.525MHz operating frequency with less loss

Hi Charlie, I noticed a new sig-gen in your video, looks like a feel tech, if so what are your thoughts on quality/performance of this unit compared to the siglent ? Thanks......Peter GW4ZUA

Thumbs Up Charlie

I’m really surprised you are able to drive the irf510 with your signal generator. Too bad you weren’t getting better results. Did you try driving it with a higher gate voltage?

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