The magic TL431 voltage regulator as a QRP AM transmitter modulator

The TL431 is a shunt voltage regulator IC intended to be used like a zener diode. But unlike a zener, which has an anode and cathode only, the TL431 has three wires (the extra being a reference). I previous found it was an effective high-gain audio amplifier, able to drive a speaker from a crystal set. In this video I use it as a modulator to allow a 7 MHz CW QRP transmitter to generate AM. As you'll hear the sound quality produced is excellent. PS: To support this channel please start your Amazon Shopping here (no extra cost to you) https://www.amazon.com/?&_encoding=UTF8&tag=v0108-20&linkCode=ur2&linkId=76822b913d6201ba868f1e9c3c326184&camp=1789&creative=9325