Hi,
As I have mentioned recently, I'm building a class D using discrete components and am now at the stage where I need to add negative feedback.
Unfortunately I am not quite sure how to do this - I am by all accounts a beginner to amp design.
My current input stage consists of a TL072 op amp configured as an inverting amplifier - 10k pot between - and output, 1k resistor between - and signal, + connected to 1/2 Vcc with a voltage divider to add DC offset. It amplifies the ~.5v P-P input signal to around 4v P-P.
What arrangement should I use to add negative feedback? I know you use an RC filter from one side of the full bridge to create the feedback signal, but what arrangement do others use to actually put the signal back in to the input stage?
Not asking anyone to design anything for me, just need some hints - still learning 🙂
Here is a hastily drawn diagram - I just need to know how I can add the negative feedback to my input stage.
As I have mentioned recently, I'm building a class D using discrete components and am now at the stage where I need to add negative feedback.
Unfortunately I am not quite sure how to do this - I am by all accounts a beginner to amp design.
My current input stage consists of a TL072 op amp configured as an inverting amplifier - 10k pot between - and output, 1k resistor between - and signal, + connected to 1/2 Vcc with a voltage divider to add DC offset. It amplifies the ~.5v P-P input signal to around 4v P-P.
What arrangement should I use to add negative feedback? I know you use an RC filter from one side of the full bridge to create the feedback signal, but what arrangement do others use to actually put the signal back in to the input stage?
Not asking anyone to design anything for me, just need some hints - still learning 🙂
Here is a hastily drawn diagram - I just need to know how I can add the negative feedback to my input stage.
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