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Part Number: LM358
The input (EXC_C) is a sine (0.7V to 4.3V, 2.5V is the middle point),the output (EXC) should be a sine (3.45V to 12.39V, 7.92V is the middle point). But the output had a bit of distortion actually.
Channel 1(yellow) is EXC, channel 2 (green) is the base of 3904. The output of LM358 at PIN1 is the same with EXC. The negative feedback doesn't work. I don't know what happened with this circuit.
channel1 is EXC, channel 2 is EXC_C.
channel 1 is EXC, channel 2 is the input of LM358 at PIN2.
The LM358 output driver has 3 * VBE voltage change between sourcing current and sinking current. This can be seen in the schematic in the data sheet. (VBE is base emitter diode forward voltage) It takes about 7 us to switch output current drive modes. An output pull down resistor could be added to keep the LM358 output always sourcing current.
The RC4558 is a low cost alternative that does not have this crossover time delay.
Regards,Ronald MichallickLinear Applications
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