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| This is an uncalibrated EMF array I designed the circuitry for and built. It uses a coil inductor, amplified by an LM358 IC, and then outputted through dual LM3914 LED Driver IC's, with a piezo buzzer. This gives me a 20 LED readout on the strength of an EMF field, and an audible tone oscillating at the frequency of the EMF. I am constantly trying new circuits and EMF amplifiers to use in research. |