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Introduction HYDRA, named after the multi-headed monster, is a miniaturized general purpose electronic engineering tool with several bits of functionality.   For instance an audio amplifier and an LED can allow for some quite extensive debugging for hobby circuits. When oscilloscopes were expensive such hardware debugging methods were popular. I wanted to build a test audio amplifier for the lab, and this project was the result. The full circuit diagram and PCB files are available (attac ...

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