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ElabGuy LM3914 LED Audio Spectrum Analyzer ASD-V1D UV Meter

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Published on Nov 30, 2010

www.ElabGuy.com
The ASD-V1D is a simple DIY kit for audio
level display. You can cascade a few
pieces together to make an audio spectrum
display. The circuit is based on the LM3914
Dot/Bar Display Driver and uses the
LED-RAINBOW bar graph as the display.
10-step Dot or Bar display mode is
selectable by the user. External audio
signals can be connected by 3.5mm audio
jacks. Audio signal gain can be adjusted by
the operational amplifier with a single
potentiometer.
This module can be powered by a single 5V
USB power supply - this can be from any PC
USB port or any USB power transformer. It
works perfectly with most computers, mp3
players, mobile phones or any audio devices
with a 3.5mm audio plug

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