Sandia National Laboratories’ researchers have built the world’s smallest acoustic amplifier.   Amplifiers can potentially be made smaller and better as acoustic devices by using sound waves instead of electrons to process radio signals. Sandia’s acoustic, 276-megahertz amplifier, measuring 0.0008 in.2 (0.5 mm2), demonstrates the potential for making radios smaller through acoustics. To amplify 2 ...

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