Decoding FSK audio to display with only transistors

For more info about this project see https://github.com/SmallRoomLabs/KCSviewer
This is my entry for the Retrochallenge 2018/09 competition. It's a transistor-only circuit that decodes the audio from a tape with data recorded in the Kansas City Standard format. Each bit in the byte-stream is displayed as a segment on the 7-segment display spelling out the HELLO RETROCHALLENGE 2018-09 stored on the tape.
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Tags: transistors
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