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Bluetooth-Enabled Audio Amplifier System with Subwoofer and Cooling Fan

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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

  1. 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.
  2. 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.
  3. Bluetooth module

    • Pins: L out, gnd, R out, 5v in +, 5v -
    • Description: Bluetooth audio receiver module.
    • Purpose: Receives audio signals wirelessly via Bluetooth.
  4. 7805

    • Pins: Vin, Gnd, Vout
    • Description: 5V voltage regulator.
    • Purpose: Regulates input voltage to a stable 5V output.
  5. 40 Fan 12v

    • Pins: +12V, -12V
    • Description: 12V cooling fan.
    • Purpose: Provides cooling to the circuit components.
  6. Loudspeaker

    • Pins: pin1, pin2
    • Description: General-purpose loudspeaker.
    • Purpose: Outputs audio signals.
  7. 8 OHM 20W SPEAKER

    • Pins: + speaker, - speaker
    • Description: 8-ohm, 20W speaker.
    • Purpose: Outputs amplified audio signals.
  8. 12v power supply

    • Pins: +, -
    • Description: 12V DC power supply.
    • Purpose: Provides power to the circuit.
  9. LED: Two Pin (red)

    • Pins: cathode, anode
    • Description: Red LED indicator.
    • Purpose: Indicates power status.
  10. Toggle Switch spst

    • Pins: L1, COM
    • Description: Single-pole single-throw toggle switch.
    • Purpose: Controls power to the circuit.
  11. 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