Would feedback cause the output to compensate for deadzone problem?
I understand why there is distortion if there is no opamp there, but not when there is an opamp with the output is connected back to inverting input of the opamp. The output would always equal to the input * gain no matter if the transistors off when input is -0.7 -- +0.7V? Is this correct?
If I add active low pass filter would that cause my output wave to be triangular?
Quotethe output of the amp isn't the real reflection of the input signal (+ gain) for short period of time around zero input signal. It causes a 'notching effect' at zero crossing that is easily seen on a scope and can be heard if one knows what to listen for. AgainAbsolutely true. However, if s3n4te is only listening to square waves out of an Arduino, he probably won't even notice it.I told him that. Not clear why one would string all those discrete components together to make a low-power amplifier when you can get an LM386 for less than the price of a pack of chewing gum?Maybe he is trying to learn how to design audio circuits, it's still an honorable task. The 'golden ear' audiophiles still frown on using opamps or ICs in general in their megabucks systems, go figure.PS: In his circuit he is taking the feedback signal not from the opamp output, but rather right from the speaker output tap, which is common for such audio amps.
the output of the amp isn't the real reflection of the input signal (+ gain) for short period of time around zero input signal. It causes a 'notching effect' at zero crossing that is easily seen on a scope and can be heard if one knows what to listen for. Again
What do you guys think?
I am using the following scheme:http://sites.google.com/site/vanyambauseslinux/_/rsrc/1298081054520/electronics/arduino-generator-signalov/fast-pwm-sound2.png
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