Jaycar Electronics LA9015 Quick Manual

The Jaycar Electronics LA9015 is a versatile audio amplifier module designed for DIY and integration projects. It features a compact design, high-efficiency Class D operation, wide input voltage range, multiple audio inputs, and built-in protection circuits. Below are key sections for overview, features, installation, connections, operation, specifications, and troubleshooting.

1. Features at a Glance 2. Installation 3. Connections 4. Specifications 5. Controls and Operation 6. Input Options 7. Protection Features 8. Thermal Management 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Class D amplifier board, terminal blocks for power and speakers, audio input connectors, gain adjustment potentiometer, status LED.

Feature	Description
Amplifier Type	Class D for high efficiency and low heat
Output Power	Up to 50W per channel (stereo)
Input Voltage	12-24V DC (wide range)
Audio Inputs	RCA and 3.5mm stereo jack
Speaker Outputs	Screw terminals for 4-8 ohm speakers
Gain Control	Adjustable via onboard potentiometer
Protection	Over-current, short-circuit, thermal shutdown
Status LED	Indicates power and fault conditions
Frequency Response	20Hz - 20kHz
Signal-to-Noise Ratio	>90dB

Installation

Unpack and inspect contents. Ensure proper ventilation and mounting.

Select location: Choose a well-ventilated area away from heat sources.
Mounting: Use provided screws to secure board to a non-conductive surface.
Power connection: Connect DC power supply to V+ and GND terminals, observing polarity.
Speaker connection: Connect speaker wires to L+/- and R+/- terminals.
Audio input: Connect source using RCA or 3.5mm jack.

WARNING! Ensure correct polarity on DC power input. Reverse polarity may damage the module.

Connections

Connect all cables before applying power.

Power: Use a regulated DC power supply (12-24V, sufficient current rating).
Speakers: Compatible with 4-8 ohm speakers. Do not short outputs.
Audio Source: Connect line-level audio from phone, PC, or preamp.
Gain adjustment: Set initial gain to minimum before power on.

CAUTION! Double-check all connections. Loose wires can cause shorts or poor performance.

Specifications

Model: LA9015
Amplifier Class: Class D
Output Power: 2 x 50W RMS @ 4Ω, 2 x 30W RMS @ 8Ω
Supply Voltage: 12-24V DC
Input Sensitivity: 200mV - 2V (adjustable)
Input Impedance: 10kΩ
THD+N: <0.05% @ 1kHz, 10W
Efficiency: >85%
Dimensions: 100mm x 60mm x 25mm
Operating Temp: 0°C to 70°C

Controls and Operation

Onboard controls: Gain potentiometer, power terminals, input jacks.

Operation: Apply power; Status LED should illuminate steady green. Adjust gain to desired volume level using a small screwdriver. No external remote control included.

Gain Setting: Turn clockwise to increase sensitivity/volume. Start low and increase gradually to avoid clipping.

Status LED Indicators: Green = Normal operation. Red/Flashing = Fault condition (overload, thermal, short).

Input Options

Two input methods provided:

RCA Inputs: Left (white) and Right (red) for line-level audio.
3.5mm Stereo Jack: For portable devices like smartphones or MP3 players.

Note: Only one input should be connected at a time. The 3.5mm jack has priority if both are connected.

Protection Features

Built-in safeguards protect the module and connected components.

Short-Circuit Protection: Automatically limits current if outputs are shorted.
Over-Current Protection: Limits output current to safe levels.
Thermal Shutdown: Disables output if temperature exceeds safe limit.
Under-Voltage Lockout: Prevents operation if supply voltage is too low.

If protection activates, remove fault condition and cycle power to reset.

Thermal Management

Class D design generates minimal heat, but proper cooling is still required.

Ensure adequate airflow around the module.
Do not cover heatsink area or place near other heat sources.
For high-power continuous use, consider adding a small fan.

Tip: Mount vertically if possible to promote convection cooling.

Care & Maintenance

Keep module clean and dry. Use compressed air to remove dust from heatsink.

CAUTION! Disconnect power before cleaning. Do not use liquids or conductive cleaners.

Regulatory Information

Complies with relevant EMC standards for conducted and radiated emissions. Designed for DIY and educational use. Not intended for medical or life-critical applications. Copyright © Jaycar Electronics. For technical support, visit www.jaycar.com.au or contact customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power (LED off)	Incorrect polarity / no voltage	Check DC supply polarity and voltage; ensure connections are tight.
LED flashing red	Short circuit / overload	Disconnect speakers and check for shorts; reduce gain.
Distorted sound	Clipping / gain too high	Reduce gain setting; check input signal level.
No audio output	Input not connected / mute	Ensure audio source is active and properly connected.
Intermittent operation	Loose connection / thermal	Check all wiring; ensure adequate cooling.

Reset: Power cycle to clear protection modes.

Service: For persistent issues, contact Jaycar Electronics support.