The LM391x LED meter circuit board is intended to allow the experimenter to easily use the LM3914, LM3915 or LM3916 chips. This is NOT a kit, merely a circuit board. The reason for not including the LM391x chip, socket, LED array and LED socket is that they are quite expensive in small quantites. The LM3914 is a linear 10 LED meter chip, the LM3915 is a 3 db per step 10 LED meter chip and the LM3916 is a 10 LED VU meter chip. Minimal documentation is included, the experimenter should be able to build/apply the board using the TI (formerly National) LM3914 datasheet , LM3915 datasheet , LM3916 datasheet .
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