12 V Speaker Protection Relay Board (30 A) for Audio Power Amplifiers
This board is designed to protect speakers by controlling the output connection through a relay based on input conditions such as power-on delay and DC fault detection.
Working Voltage:
Input supply: 0 to 12 V AC (step-down transformer or auxiliary AC source)
Current Capacity:
Maximum switching current: up to 30 A (depends on relay rating and load conditions)
Relay type: L90 / H90 T-type relay
Protection Features:
Turn-on delay: approximately 1 to 2 seconds to prevent speaker damage from power-on/off transients
DC detection: disconnects speakers when DC voltage of approximately 2 V or higher is detected
LED indicators: red and green LEDs for status and fault indication
Board Specifications:
PCB dimensions: 75 mm × 55 mm
Configuration:
Designed to be connected between amplifier output and speaker load
Requires proper wiring and compatible AC supply for relay operation
Intended Use:
Speaker protection in audio amplifier systems
Prevention of speaker damage due to DC offset and switching transients
Suitable for home audio systems, subwoofer amplifiers, and DIY audio projects
