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Electret Microphone Amplifier - MAX4466 with Adjustable Gain : ID 1063 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amp-Up™ Personal UHF Voice Amplifier with Wireless Microphone – up to 40 Channels without Interference! - HamiltonBuhl
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Amazon.com: Rodyweil Microphone Preamp Mic Gain Booster with 2 Input Max 75db Gain 48V Phantom Power XLR Output for Dynamic and Condenser Mic : Musical Instruments
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