7400 competition entry: AM radio transmitter

Andrew entered an AM radio transmitter into the Open 7400 Logic Competition:

My 7400 contest entry is an AM Radio Transmitter, which nicely complements another entry. The TX frequency is digitally tunable from 520kHz – 1.6MHz, although this part of the circuit is open loop, so tuning to a specific frequency may require a slight adjustment on a potentiometer. The RF section is strong enough to broadcast across a room, but weak enough that it shouldn’t interfere with anything important. Here is a screen shot of a 1kHz audio signal on a 930 kHz (approx) carrier. Full circuit information, including the theory of operation, is outlined on my website.

Via the forum.

Check out the video of his entry below.

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