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MOSFET transistor

At the site of Pekka (OH1TV) among many other interesting designs worth checking out is QRP CW transmitter based on a single MOSFET transistor. There are many projects transmitters for CW QRPp transistor (ie with less than 1W) but for powers of 2 to 5W is used normally to a second stage, or even a third, as in the case of designs derived from Pixie (in itself in two stages) to which is added a PA to increase power to the range of 2 to 5W. The interesting thing about this design is to see the technique in which Pekka feedback control so that the current in the crystal is not damaged, as would happen if we want to generate an oscillator with a conventional design directly on this level of power. The rest of the circuit is quite conventional, manipulation may optionally be a floating or against mass. In the conventional lowpass output filter ensures that the harmonic radiation is acceptable.

Subject: ESS.
Student: Pedro Jose Contreras Urbina
Source: http://lu7hz.blogspot.com/2010/01/transmisor-qrp-de-un-transistor-mosfet.html