Project Documentation

Bluetooth-Enabled Audio Amplifier System with Subwoofer and Cooling Fan

Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes various audio components such as amplifiers, a Bluetooth module, a subwoofer pre-amp board, and speakers. The circuit is designed to amplify audio signals and drive speakers, with power regulation and control components to ensure proper operation.

Component List

Tpa 3110 30W+30W amplifier module
- Pins: Vcc, Gnd, R, L, R-, R+, L-, L+
- Description: 30W+30W stereo amplifier module.
- Purpose: Amplifies audio signals for stereo output.
SUBWOOFER PRE-AMP Board
- Pins: 12 +, 12 -, sub +, L, Gnd, R
- Description: Pre-amplifier board for subwoofer.
- Purpose: Pre-amplifies audio signals for the subwoofer.
Bluetooth module
- Pins: L out, gnd, R out, 5v in +, 5v -
- Description: Bluetooth audio receiver module.
- Purpose: Receives audio signals wirelessly via Bluetooth.
7805
- Pins: Vin, Gnd, Vout
- Description: 5V voltage regulator.
- Purpose: Regulates input voltage to a stable 5V output.
40 Fan 12v
- Pins: +12V, -12V
- Description: 12V cooling fan.
- Purpose: Provides cooling to the circuit components.
Loudspeaker
- Pins: pin1, pin2
- Description: General-purpose loudspeaker.
- Purpose: Outputs audio signals.
8 OHM 20W SPEAKER
- Pins: + speaker, - speaker
- Description: 8-ohm, 20W speaker.
- Purpose: Outputs amplified audio signals.
12v power supply
- Pins: +, -
- Description: 12V DC power supply.
- Purpose: Provides power to the circuit.
LED: Two Pin (red)
- Pins: cathode, anode
- Description: Red LED indicator.
- Purpose: Indicates power status.
Toggle Switch spst
- Pins: L1, COM
- Description: Single-pole single-throw toggle switch.
- Purpose: Controls power to the circuit.
Tpa 3118 60 w mono amplifier module
- Pins: Power +, power -, audio out -, audio out +, audio in -, audio in +, mute
- Description: 60W mono amplifier module.
- Purpose: Amplifies audio signals for mono output.

Wiring Details

Tpa 3110 30W+30W amplifier module

Vcc: Connected to 12V power supply (+) and Toggle Switch spst (COM).
Gnd: Connected to 12V power supply (-), SUBWOOFER PRE-AMP Board (12 -), 7805 (Gnd), Tpa 3118 60 w mono amplifier module (power -), Bluetooth module (5v in +), 40 Fan 12v (-12V), and LED: Two Pin (red) (cathode).
R: Connected to SUBWOOFER PRE-AMP Board (R) and Bluetooth module (R out).
L: Connected to SUBWOOFER PRE-AMP Board (L) and Bluetooth module (L out).
R-: Connected to 8 OHM 20W SPEAKER (- speaker).
R+: Connected to 8 OHM 20W SPEAKER (+ speaker).
L-: Connected to 8 OHM 20W SPEAKER (- speaker).
L+: Connected to 8 OHM 20W SPEAKER (+ speaker).

SUBWOOFER PRE-AMP Board

12 +: Connected to 12V power supply (+) and Toggle Switch spst (COM).
12 -: Connected to 12V power supply (-), 7805 (Gnd), Tpa 3118 60 w mono amplifier module (power -), Bluetooth module (5v in +), Tpa 3110 30W+30W amplifier module (Gnd), 40 Fan 12v (-12V), and LED: Two Pin (red) (cathode).
sub +: Connected to Tpa 3118 60 w mono amplifier module (audio in -) and (audio in +).
L: Connected to Bluetooth module (L out) and Tpa 3110 30W+30W amplifier module (L).
Gnd: Connected to Bluetooth module (gnd) and Tpa 3110 30W+30W amplifier module (Gnd).
R: Connected to Bluetooth module (R out) and Tpa 3110 30W+30W amplifier module (R).

Bluetooth module

L out: Connected to SUBWOOFER PRE-AMP Board (L) and Tpa 3110 30W+30W amplifier module (L).
gnd: Connected to SUBWOOFER PRE-AMP Board (Gnd) and Tpa 3110 30W+30W amplifier module (Gnd).
R out: Connected to SUBWOOFER PRE-AMP Board (R) and Tpa 3110 30W+30W amplifier module (R).
5v in +: Connected to 12V power supply (-), SUBWOOFER PRE-AMP Board (12 -), 7805 (Gnd), Tpa 3118 60 w mono amplifier module (power -), Tpa 3110 30W+30W amplifier module (Gnd), 40 Fan 12v (-12V), and LED: Two Pin (red) (cathode).
5v -: Connected to 7805 (Vout), 40 Fan 12v (+12V), and LED: Two Pin (red) (anode).

7805

Vin: Connected to 12V power supply (+) and Toggle Switch spst (COM).
Gnd: Connected to 12V power supply (-), SUBWOOFER PRE-AMP Board (12 -), Tpa 3118 60 w mono amplifier module (power -), Bluetooth module (5v in +), Tpa 3110 30W+30W amplifier module (Gnd), 40 Fan 12v (-12V), and LED: Two Pin (red) (cathode).
Vout: Connected to Bluetooth module (5v -), 40 Fan 12v (+12V), and LED: Two Pin (red) (anode).

40 Fan 12v

+12V: Connected to 7805 (Vout), Bluetooth module (5v -), and LED: Two Pin (red) (anode).
-12V: Connected to 12V power supply (-), SUBWOOFER PRE-AMP Board (12 -), 7805 (Gnd), Tpa 3118 60 w mono amplifier module (power -), Bluetooth module (5v in +), Tpa 3110 30W+30W amplifier module (Gnd), and LED: Two Pin (red) (cathode).

Loudspeaker

pin1: Connected to Tpa 3118 60 w mono amplifier module (audio out -).
pin2: Connected to Tpa 3118 60 w mono amplifier module (audio out +).

8 OHM 20W SPEAKER

+ speaker: Connected to Tpa 3110 30W+30W amplifier module (R+).
- speaker: Connected to Tpa 3110 30W+30W amplifier module (R-).

8 OHM 20W SPEAKER

+ speaker: Connected to Tpa 3110 30W+30W amplifier module (L+).
- speaker: Connected to Tpa 3110 30W+30W amplifier module (L-).

12v power supply

+: Connected to Toggle Switch spst (COM), SUBWOOFER PRE-AMP Board (12 +), 7805 (Vin), and Tpa 3110 30W+30W amplifier module (Vcc).
-: Connected to SUBWOOFER PRE-AMP Board (12 -), 7805 (Gnd), Tpa 3118 60 w mono amplifier module (power -), Bluetooth module (5v in +), Tpa 3110 30W+30W amplifier module (Gnd), 40 Fan 12v (-12V), and LED: Two Pin (red) (cathode).

LED: Two Pin (red)

cathode: Connected to 12V power supply (-), SUBWOOFER PRE-AMP Board (12 -), 7805 (Gnd), Tpa 3118 60 w mono amplifier module (power -), Bluetooth module (5v in +), Tpa 3110 30W