Hello guys, I hope you are all doing well.
I'm new to amplifiers and sound systems so I don't know much about them. I'm building a small sound system for my room, this is the setup for just the subwoofer. I have purchased the bluetooth module, pre-amp and power-amp from AliExpress so they aren't of very high quality.
The Pre-amp and Power-amp run on 12 volts while the bluetooth module operates at 5 volts. The Power-amp is rated at 150 watts max. My Subwoofer is dual coil, 1.2 ohm (I guess it becomes 2.4 ohms when I connect the coils in series), and 60 watts RMS, 150 watts max.
I need your help with the connections. Here's how I did it:
The three wires from Bluetooth module (R G L) go into the Pre-amp, the output wires (two wires) from the Pre-Amp go into the input of the Power-amp. The two output wires from the powe-amp go into the subwoofer.
I'm feeding this system with a 12v 10A power adapter.
These are the issues I'm facing:
1. There is a constant noise in the subwoofer. When I disconnect the audio input wires from the pre-amp, the noise goes away. If I take out the pre-amp completely, there's still a buzz in the Power-amp.
2. The sound volume starts to fluctuate after a while. It goes up and down on its own.
3. Sometimes I hear ticking noises in the subwoofer, it's not clipping because I can hear them even when the volume is very low.
I'm attaching a rough diagram of these circuits. Please pardon me if I'm doing something wrong. Your help will be appreciated.
I'm new to amplifiers and sound systems so I don't know much about them. I'm building a small sound system for my room, this is the setup for just the subwoofer. I have purchased the bluetooth module, pre-amp and power-amp from AliExpress so they aren't of very high quality.
The Pre-amp and Power-amp run on 12 volts while the bluetooth module operates at 5 volts. The Power-amp is rated at 150 watts max. My Subwoofer is dual coil, 1.2 ohm (I guess it becomes 2.4 ohms when I connect the coils in series), and 60 watts RMS, 150 watts max.
I need your help with the connections. Here's how I did it:
The three wires from Bluetooth module (R G L) go into the Pre-amp, the output wires (two wires) from the Pre-Amp go into the input of the Power-amp. The two output wires from the powe-amp go into the subwoofer.
I'm feeding this system with a 12v 10A power adapter.
These are the issues I'm facing:
1. There is a constant noise in the subwoofer. When I disconnect the audio input wires from the pre-amp, the noise goes away. If I take out the pre-amp completely, there's still a buzz in the Power-amp.
2. The sound volume starts to fluctuate after a while. It goes up and down on its own.
3. Sometimes I hear ticking noises in the subwoofer, it's not clipping because I can hear them even when the volume is very low.
I'm attaching a rough diagram of these circuits. Please pardon me if I'm doing something wrong. Your help will be appreciated.
Attachments
Hey,
Seems like there is an issue with the amp.
Id inspect that board closely. Do you have another driver to test with?
Seems like there is an issue with the amp.
Id inspect that board closely. Do you have another driver to test with?
Guess it's due to ground loops. What power source do you use for the bluetooth module? Please upload full images your system.
It is an AC to DC adapter. It powers the whole system with 12 volts and can provide10 Amps max. I'm using the 7805 voltage rectifier (12v to 5v) to power the bluetooth module.
