Technical Topics > The RF Workbench

Someone had Corsair II AM TX experience?

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redhat:
4W is with 14V applied to the PA.  Not really class E, as all I did was put a resonant tank in the drain of the fet tuned to the carrier frequency.  More like class C operation, although I did get north of 80% efficiency out of it.

I'll start a new thread for it when the video is posted.

+-RH

Stretchyman:
Just depends on how you drive it, squarewave = class E, sine =C, sure there's more to it as the o/p has to be bandpass but still the quicker the switching the greater the eff% pure and simples.

Str.

Intruder:

--- Quote from: Stretchyman on February 12, 2021, 1642 UTC ---It's not the best design and have no idea why it gets so much attention.


--- End quote ---

The reason why it gets some much attention is that many have been built and used in the past. I've found out so much about the designs asking the right people. The parts are easy to get hold of and if your into home construction it can cost under 20 UK pounds to build depending on the version.

I've built Corsette (LM386), Corsair (LM386) and Commando (Transformer) that's on Dave's website and in my opinion they all work well.

Never used these class D ampilifiers but now I've got a few builds under my belt this will be my next project.

Stretchyman:
So a design that uses less parts (still commonly available) and is more efficient etc gets less attention? Doesn't make sense, apart from the fact it's got some kind of web/utoob kudos. I guess it's the internet generation....

There's so many designs for stuff like this around and 99% would never work without decent layout etc and was the only reason I ever designed a PCB

The class D mod amps are great, bought 100 a few months ago direct. Shame they no longer have the space for the regulator and the front end has a really dumb response, most strange, easily sorted with a few simple component changes.

Details are available..

Str.

Intruder:

--- Quote from: Stretchyman on February 13, 2021, 1245 UTC ---So a design that uses less parts (still commonly available) and is more efficient etc gets less attention? Doesn't make sense, apart from the fact it's got some kind of web/utoob kudos. I guess it's the internet generation....

--- End quote ---

Str,
I'm not saying it should or will get less attention. For me it was, I've had prebuilt Corsair from Dave back in 2007 and it worked I stupidly sold it. I wanted another one but this time I had to build it, pretty much had all the components for this design in my junk box and yes details of the Corsair are on the net with many people building them and had some excellent support from a HFU member.

Been guided towards the LuLu design by the person that helped me and it will be my next project. If you are willing to provide support I will value you experience and knowledge  :)

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