7400 competition entry: AM radio transmitter

Posted on Friday, October 21st, 2011 in 7400 contest by DP

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.

This entry was posted on Friday, October 21st, 2011 at 11:30 am and is filed under 7400 contest. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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