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We wanted a speaker as well as headphones, so an OP-07 op amp was used to provide enough gain. Headphones, a more powerful amplifier, or a computer’s audio input can also be plugged into the phone jack. It will pick up car remotes, computer WiFi, microwave ovens, strong radio stations, etc, as well as cell phones. Different diameter loops or a telescoping whip can plug into the BNC antenna input
