| Electronics > Projects, Designs, and Technical Stuff |
| TL072 drop in substitutes? |
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| james_s:
Compare your circuit to the examples presented here, you have a resistor from the output to the inverting input but there is no corresponding resistor to form a voltage divider with the one that's there. Since the inputs have essentially infinite impedance, the resistor you have is doing nothing and the potential on the inverting input is going to be equal to the potential on the output, this results in a unity gain buffer. You should try to gain a fundamental understanding of how an op-amp works and how to calculate the gain, then it will be easy to figure that part out. Note the comment under those examples, Gain = 1 + R1/R2, pick a value for one of those resistors, 4.7k is a reasonable starting point, then go from there. |
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