A simple active speaker protection circuit to share

This is a simple active speaker protection circuit that has a very important purpose, especially protecting speakers in audio systems. It prevents the speakers from making noise when we turn on the power amplifier. This circuit drives the speaker after 3 to 10 seconds to allow the same source to stabilize and stop producing cracks and noise that can damage the speaker and amplifier output transistors. This circuit is powered by a 12V regulated power supply. If you have a high powered audio system you could try building this circuit and installing the circuit in an amplifier box.

Bottom PCB Layout Design | Active Speaker Protector

Top PCB Design | Active Speaker Protector

Speaker protection circuit connections

Active Speaker Protector Parts List

5 Pin 12 Volt Relay – 2

Transistor 2SC945–2

Transistor 2SC9013–1

Diode 1N4007–5

Elko 220uF/50V–2

Resistor 10KOhms–4

Resistor1KOhms–1

Resistor 39KOhms–1

Large 3-pin connector – 2

Small 3-pin connector – 1

220KOhms or 500KOhms Trimpot–1