Jason Milldrum has been documenting the design of Project Yamhill, the successor to the Willamette Transceiver, also known as the qrp-l Group Project. The purpose of this endeavor is to provide a platform to learn about radio electronics at a system level.
The last circuit block in this first tranche of boards for Project Yamhill is an audio feedback amplifier specifically designed to be the first stage of audio amplification in a direct conversion receiver with a diode-ring mixer. This particular circuit was designed by the famous Wes Hayward, W7ZOI and can currently be found on his website.
You can see this project post here and all the posts in Jason’s blog. The GitHub repo is here.
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