AVT 1853 Quick Start Manual

RGB LED Illuminophony
kits
The key to a successful event is not only a good
music, but also good lighting. Presented RGB LED
controller circuit will even meet the expectations of
the fussiest of partygoers.

Circuit description

Electrical diagram of the device is shown in Figure 1. It
consists of a microcontroller, an operational amplifier
and power transistors. The input signal is provided by
the C1 capacitor to the input of the operational
amplifier. The input polarising voltage is determined
by a divider made up of resistors R9, R10, R13, R14.
The microcontroller (ATmega8) is clocked by an
internal RC generator operating at 8 MHz. Analogue
signal from the audio amplifier is measured using an
A/D converter and is delivered to the
PC0 input. The program 'selects' components in the
following frequency ranges from the audio signal:
High: 13...14 kHz.
Medium 6...7 kHz.
Low 500 Hz...2 kHz.

Specifications

• working with LED strips or RGB modules
• single channel load: 3A
• selectable input signal:
- microphone (MIC)
- LINE IN socket
• 7 effects to choose from
• power supply: 12 VDC
• board size: 79×58 mm
The programme then calculates the light intensity
value for each channel and controls the output
transistor in proportion to the result. Activators are
transistors T1...T3 (BUZ11) with a high current-
carrying capacity. There is a LINE IN input on the
board for direct input of an AUDIO signal of 0.7 V
(typical headphone output). You can select the sound
source using the SEL jumper: CINCH (RCA) or
microphone (MIC).
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ASSEMBLY DIFFICULTY
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