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File:Scale and adjustment knob on beat frequency generator STI 4032 from Rohde &Schwarz (1944).jpg - Wikimedia Commons
![File:Main scale of beat frequency generator STI 4032 from Rohde und Schwarz, 1944.jpg - Wikimedia Commons File:Main scale of beat frequency generator STI 4032 from Rohde und Schwarz, 1944.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/3/34/Main_scale_of_beat_frequency_generator_STI_4032_from_Rohde_und_Schwarz%2C_1944.jpg/1024px-Main_scale_of_beat_frequency_generator_STI_4032_from_Rohde_und_Schwarz%2C_1944.jpg)
File:Main scale of beat frequency generator STI 4032 from Rohde und Schwarz, 1944.jpg - Wikimedia Commons
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What is a Beat Frequency Oscillator? Definition, Block Diagram and Working of Beat Frequency Oscillator - Electronics Coach
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Conceptual diagram of a beat frequency oscillator based audio generator. | Download Scientific Diagram
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General Radio Co Beat-Frequency Audio Generator | AEI Electronic Center Liquidation - GOLDEN VALLEY, Auction #3 | K-BID
![Beat Frequency Oscillator (audio signal generator). Frequency coverage 10 - 13500 cps. Made by A.W.A. in 1944. | Awa, Radio, Beats Beat Frequency Oscillator (audio signal generator). Frequency coverage 10 - 13500 cps. Made by A.W.A. in 1944. | Awa, Radio, Beats](https://i.pinimg.com/736x/d0/9f/b9/d09fb93a43a496904c39c73ba6143ea1.jpg)