Doing a class D Amp project using TL494
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 Class D Switching Power Amplifiers and Power D/A conversion

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 12th October 2009, 09:07 AM #351 diyAudio Member   Join Date: Jul 2009 Ok I see what you mean now. The control book had circuits comprised of Op-amps as a PI controller and they used 4 resistors and 1 capacitor for a PI controller. Well PI controller + Inverter.. My question is what's in the feedback path then after the RC low pass filter because I am confused now. I have a differential output when I need a single ended output. So what sort of circuit do i need to do this. Diff amp like before? This how I see the control loop as http://img213.imageshack.us/img213/8120/10047089.png And my PI controller as well http://img122.imageshack.us/img122/1127/pi1.png So I am clear on my PI controller now.. But the feedback path now I am confused now.
 12th October 2009, 09:23 AM #352 diyAudio Member   Join Date: Jul 2009 output/input = -R2/R1 + 1/R1*C*s = Kp + 1/T*s So basically the proportional gain and the time constant Tau (integral block part)..
 13th October 2009, 10:17 AM #353 diyAudio Member   Join Date: Jul 2009 Any feedback on what I got to use in the feedback path. I have two inputs, which I need to convert into a single ended input before it get's summed with the music signal and so on.
 23rd December 2011, 03:57 PM #354 diyAudio Member   Join Date: Dec 2011 What happened to this project? I read the whole thread and now I really wanna know what the circuit looks like. I'm doing a similar project. What were the conclusions? Thank you
 18th April 2013, 04:50 PM #355 diyAudio Member   Join Date: Apr 2008 Amod, pls, if possible, share with us your 50W + TL494 amplifier circuit. Tks.

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