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Maxim > Design Support > Technical Documents > Application Notes > A/D and D/A Conversion/Sampling Circuits > APP 4620
Maxim > Design Support > Technical Documents > Application Notes > Audio Circuits > APP 4620
Maxim > Design Support > Technical Documents > Application Notes > Display Drivers > APP 4620
Keywords: ADCs, A/D converters, analog-digital converters, shift registers, parallel-output registers,
transformers, transformer drivers, TRIACs
APPLICATION NOTE 4620
Set Your Holiday Lights to Music
By: Hanif Saeed
Oct 14, 2009
Abstract:
This circuit
digitizes music with a 12-bit A/D converter, monitors the resulting digital outputs, and
produces a logarithmic thermometer-code format to control multiple power outlets.
This design idea appeared in the August 6, 2009 issue of EDN
magazine.
As one of many ways you can implement a light show, this one
selectively activates various subsets in a group of six strings of
Christmas tree lights, causing them to flash on and off according to
the level and tempo of music you are playing. The stand-alone circuit
(Figure 1) requires no microcontroller, no software, and no trimming.
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