History of Development


Ever since I became familiar with broadband amplifiers, I had been trying to design a superhet with one amplifier that did all the work from RF amplification to the IF and even audio.

One day I was studying the MOSFET single balanced mixer in DeMaw's Design Notebook and discovered that just one change on the gate 2 circuit would change it from a mixer to an amplifier, or to an AGC controlled amplifier.

I immediately built four of these mixers and made the changes to make my single circuit superhet, and it worked great!

Using a balanced amplifier at all the stages seemed excessive, so a single MOSFET amplifier was designed that would work in all places. Two single amplifiers could be put together to form the balanced mixer. This design was equally successful.

The First Universal MOSFET Receiver

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