Just thought id let you guys see my project see what you guys think. Its a subwoofer amplifier based on the Tripath TK2350 evaluation board. My power supply is +/-45Vdc. The preamp stage has a MAX260 switched cap filter which i have programmed as a 4th order butterworth(can easily change to bessel if you guys think thats better) with an adjustable cutoff frequency from 60Hz to 120Hz in 5Hz steps. Next is a PGA2311 stereo volume IC, im only using one channel of course. The gain is from -30dB to +30dB in 3dB, then 2dB then 1dB steps as the gain gets higher. All of this is adjusted with optical rotary encoders and an Atmel Mega16 micro. Also the LCD displays the volume and x-over settings.
Now the issues. I didnt buffer the signal between the Max260 and the PGA2311. I dont think the 260 is able to drive the 2311. Would that cause this rumbling i get? Its not a ground loop for when i increase the x-over i hear higher frequency noise.
Now the issues. I didnt buffer the signal between the Max260 and the PGA2311. I dont think the 260 is able to drive the 2311. Would that cause this rumbling i get? Its not a ground loop for when i increase the x-over i hear higher frequency noise.