hello, I would like to design a linear push pull class-AB 20W power amplifier in the HF band using similar RD16HHF Mitsubishi transistors. Here are the questions: 1- In this scenario, how much gain can I get from this push pull amplifier? 2- How I should calculate optimal values of the feedback network, to achieve maximum flatness over the entire bandwidth? 3- How can I estimate the input impedance of the power amp? 4- How much excess power (than required) is needed at the output of the previous stage to maintain the linearity of the power amp.? 5- What's the reasonable values of the 2nd and 3rd harmonics (relative to the first harmonic)? In what percentage of the output power I should measure them? any help or hint about the above mentioned problems would be appreciated, regards bye

Honestly, I think you should start out a little easier. Try to find a construction of an astable multivibrator, and work yourself up from there. Eventually, you will be able to figure things out by yourself. Happy building. :-)

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