Hi,
I'm looking for help on constructing a very simple summing amplifier using an op amp. I have built a small circuit (please see attached schematic), but it is not behaving like I thought it would.
When I put my voltmeter to the two lines I need to add together, it reads 0,72 V (black probe to ground, red probe to left leg of the 1K resistor, marked with a red pen). I would expect the summing amplifier to perform 0,72V + 0,72V = 1,44V, right? When I measure the output from the op amp (black probe to ground, red probe to LED pin), I get 0,6V?
Have a nice weekend!
I'm looking for help on constructing a very simple summing amplifier using an op amp. I have built a small circuit (please see attached schematic), but it is not behaving like I thought it would.
When I put my voltmeter to the two lines I need to add together, it reads 0,72 V (black probe to ground, red probe to left leg of the 1K resistor, marked with a red pen). I would expect the summing amplifier to perform 0,72V + 0,72V = 1,44V, right? When I measure the output from the op amp (black probe to ground, red probe to LED pin), I get 0,6V?
Have a nice weekend!
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