I bought this assembled modules on eBay , they only hummm through the speakers , I think it's a grounding problem but I don't know how to ground them. Is it a problem that both modules share the same dissipator? I have 4 fans on the chassis to prevent heating.
1pair A6 HD1969 Pure Class A Power Amplifier Board Power Enhanced Version | eBay
1pair A6 HD1969 Pure Class A Power Amplifier Board Power Enhanced Version | eBay
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How have you wired them up?
Could be they just don't work, often the transistors in these are fake
Could be they just don't work, often the transistors in these are fake
Maybe I need to adjust the Quiescent current to the 30v a.c. I'm using, still I think there should be a connection from ground to the chassis
Yes ground should be connected to chassis, usually at the inputs.
But you need to set the quiescent current and bias.
But you need to set the quiescent current and bias.
Thank you Ubergeeknz for all your help , it's working fine , just had to connect input ground to chassis , my first amp build I'm still a newbie