PA System Schematic Design
Create a clean electronic schematic diagram of a simple public address (PA) system using a Bluetooth audio module and LM386 amplifier.
Include the following components and connections:
-
Bluetooth Audio Module (MH-M18 type)
- VCC connected to +5V
- GND connected to Ground
- Left audio output (L) connected to amplifier input
- Audio GND connected to circuit ground
-
LM386 Audio Amplifier IC
- Pin 6 to +9V supply
- Pin 4 to Ground
- Pin 3 as input from Bluetooth module through a coupling capacitor (10µF)
- Pin 2 to Ground
- Pins 1 and 8 optionally connected with capacitor for gain
- Pin 5 as output to speaker through capacitor (220µF)
-
Speaker
- 8 ohm speaker connected to output of LM386
- Other terminal to Ground
-
Power Supply
- 9V battery for LM386
- 5V regulated supply for Bluetooth module
- Common ground for entire circuit
-
Add labels:
- +9V
- +5V
- GND
- Audio Input
- Speaker Output
Style requirements:
- Black and white engineering schematic style
- Clear component symbols
- IC pins labeled
- Straight wiring
- No background
- Suitable for ECE project report
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