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Audio - all subcategories
High headroom input circuitry. 9V Battery powered.
author: RED Free Circuit Designs visits: 8390 
Measures 10mV to 50Volt RMS in eight ranges
author: RED Free Circuit Designs visits: 8080 
Small simple audio mixer with a few components around one FET transistor (2N3819).
author: visits: 7769 
Small but useful device. It can amplify signal from many audio devices for your headphones.
author: RED Free Circuit Designs visits: 7544 
This circuit indicates audio output power via three LEDs. Nice addon to your amplifier.
author: RED Free Circuit Designs visits: 7319 
Small, easy to build low impedance microphone amplifier
author: visits: 7082 |
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