When the CK722 “hobbyist’
transistor became available in early 1953, there was a tremendous demand by
experimenters, engineers, radio amateurs, and many othes for circuits and
projects using this new technology.
Electronics publications of the time responded with numerous
articles featuring the CK722, and one of the most popular of these “build
it yourself” projects was the CK722 radio.
Over the past five decades, it is likely that thousands of these
simple radios have been built by those who were learning about transistor
technology for the first time.
Anniversary CK722 radio is an accurate and faithful version of these early
and memorable projects. Variations
of the circuit have appeared in numerous publications, including the widely
distributed “Volume II Raytheon Transistor Applications” booklet from 1957. In addition, the germanium diode and
CK722 used in this project are functioning devices from the
1950s/1960s. When construction of
this project has been completed, and a local radio station is tuned
in, we’ll be following in the
footsteps of countless others who have taken this same exciting path while
exploring early transistor many years ago.
Anniversary CK722 Radio
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