SYNACORP STS-105A User manual

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For purchase & enquiries, please contact sal[email protected].my or call 04-5860026
STS-105A: LM3915 AUDIO LEVEL INDICATOR DIY KIT
Power Supply voltage: 9-12V (DC voltage)
PCB Full Assembly
(Board size: 27*58mm)
Component List
R1, R5 & R8=1kΩ, R2=100 Ω,
R3=10kΩ, R4=50kΩVariable Resistor,
R6=560Ω, R7=10Ω, R9=20kΩ, C1 &
C2=104 Ceramic Capacitor, U1=IC
LM3915, D9 & D10= Red LED, D1-
D8=Yellow LED, J2=XH2.54-2P
Connector, J1 & J3=Male Header 2 Pin,
IC Socket 18 Pin & PCB Board.
Total Item = 26
Schematic Diagram

_____________________________________________________________________________________
For purchase & enquiries, please contact sal[email protected].my or call 04-5860026
Component List:
Introduction:
This Audio level indicator DIY KIT need the audio output to be connected to the two pins of J1 in the circuit. The
audio output that supported are from speaker or earphone. The louder audio, the higher the signal strength. This
DIY KIT will light up LED to indicates the current level of signal of audio that it received. The higher signal means
more LED will be light up and the lower signal mean less LED will be light up.
Connection Setup 1: Use DIY KIT with Audio Jack Connector that connected to audio input source (phone).
Connection Setup 2: Use DIY KIT with Microphone Module kit STS-105B as audio source input for Cordless Audio
Level Meter
Components
Quantity
Reference
Components
Quantity
Reference
1kΩ Resistor
3
R1, R5 & R8
100nF/104 Ceramic Capacitor
2
C1 & C2
100Ω Resistor
1
R2
LM3915
1
U1
10Ω Resistor
1
R7
LED RED
2
D10 & D9
10kΩ Resistor
1
R3
LED YELLOW
8
D1 - D8
20kΩ Resistor
1
R9
IC Socket 18 Pin
1
U1
560Ω Resistor
1
R6
XH2.54-2P Connector Set
1
J2
50kΩ Variable Resistor
1
R4
Male Header 2 Pin Set
2
J1 & J3
Total Item = 26
37
Phone as
Audio
Power Supply
Audio