Description: This is a kit parts. You should solder it by yourself. Features: 1. High sensitivity; 2. Low power; 3. Wide operating voltage range; 4. Low power consumption; 5. DIY design; 6. Colorful display; 7. Mode adjustable; Parameter: No. Parameter Value 1 Model: ASD-84; 2 Standby current: Less than 1mA; 3 Soldering difficulty Level: Easy; 4 Working voltage: DC5V; 5 Display LED: 8*4; 6 Display color: Red+Blue; 7 LED Size: 2*5*7; 6 PCB Size: 94*39.5mm; Instructions: Step 1: Complete the installation in the normal way following installation manual and schematic. (Please request separately). Step 2: Connect audio; Step 3: DC 4-9V voltage; Step 4: Adjust the working mode; Step 5: Test and use. Mode setting: Mode Set Method Remarks: Factory Testing Mode Press button S1 before Power on It is used to detect all LED whether can be ON; Fast Flashing Mode(3) Short press S1 less than 1second The refresh frequency is very fast; Medium Flashing Mode(2) Short press S1 less than 1second The refresh frequency is general; Slow Flashing Mode(1) Short press S1 less than 1second The refresh frequency is slow; High Sensitivity Mode(H) Long press S1 more than 2second It can detect weaker audio signals; Medium Sensitivity Mode(B) Long press S1 more than 2second It can detect general audio signals; Low Sensitivity Mode(L) Long press S1 more than 2second It can filter more interference audio signals; Using attention: 1. Please make sure all the components in the right direction and right place. 2. Please check whether pseudo/float welding. This is very important. 3. The soldering iron can't touch the components for a long time, otherwise, the components will be damaged because of the high temperature. 4. It is recommended to use a stable power supply, otherwise, it may interfere with the audio signal output. Component list: NO. Component Name PCB Marker Parameter Quantity: 1 Metal Film Resistor R15 10ohm 1; 2 Metal Film Resistor RX1-RX4,RY5-RY12 47ohm 12; 3 Metal Film Resistor R13-R14 470K 2; 4 Ceramic Capacitor C5 0.001uF 102 1; 5 Ceramic Capacitor C2-C4 0.1uF 104 3; 6 Electrolytic Capacitor C1 220uF 1; 7 Red LED D1-D16 2*5*7mm 16; 8 Blue LED D17-D32 2*5*7mm 16; 9 Audio Socket J2,J3 SMD3P 2; 10 Power Socket J1 DC3.5 1; 11 WD1084 U1 DIP-16 1; 12 Button S1 6*6*5 1; 13 USB to DC Cable; 100cm 1; 14 Audio Cable; 100cm 1; 15 PCB ASD-84 94*39.5mm 1; Application: 1. Electronic teaching; 2. Exercise soldering skills; 3. Circuit application; Frequency asked questions: 1. Why can't work? A: Please make sure all components in the right direction and right place and check whether pseudo/float welding. This is very important. Install tools you needpreliminary preparation by yourself: 1>. Soldering iron; 2>. Multimeter; 3>. Solder wire; 4>. Iron stand; 5>. Diagonal cutting pliers; 6>. The screwdriver; 7>. Tweezers; 8>. Long nose pliers; 9>. Suction tin; 10>. Cleaning sponge; 11>. Screwdriver set.