Red Blue Green RGB Voice Control Indicator Level 3 Sections Module Electronic Production DIY Kit Electronic PCB Board
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Red Blue Green RGB Voice Control Indicator Level 3 Sections Module Electronic Production DIY Kit Electronic PCB Board

$12.27
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  1. Features Power Voltage: 9V--15V; PCB Dimensions: 160mm*42mm.   2. Circuits Principle The circuit is mainly composed by Power Circuit, Audio Amplifier Circuit, Frequency Dividing Circuit and LED Driver Circuit. 1) Power Circuit: The power output voltage is 9V--15V. D1 can avoid the demage of three terminal regulator when the power polarity is connected in a wrong way. After the C4's filtering , L7806 three terminal regulator will provide the whole circuit with a stable voltage of 6V. 2 ) Audio Amplifier Circuit: Electret microphone MK1 transfers the obtained sound to electric signal which will be amplifed twice by Q1 and Q2. At this time, UR1 can adjust the size of Q2 signal in order to adjust the sensitivity of the whole circuit. 3 ) Frequency Dividing Circuit: Three frequency dividing circuits is added to indicate the electrical level on the different frequency, as it's featured with three sections of LED indicator in a seperate way. VR2, VR3 and VR4 are used for adjusting the

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