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| Hi, please i wish to know if the calculations for this summing amplifies is ok |
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| nyame:
Hi, please i wish to know if the calculations for this summing amp is ok |
| Wimberleytech:
This is what I get (oops...negative Vout) |
| Mechatrommer:
--- Quote from: nyame on June 05, 2018, 04:30:44 pm ---Hi, please i wish to know if the calculations for this summing amp is ok --- End quote --- its not ok. just one example.. 900Mv is not 9V. learn the difference between MV and mV (Mega vs milli Volt), Mv (lower case v) is out of context there. 900Mv is 900,000,000v. i'm assuming its 900mV (capital V) which is 900mV = 0.9V |
| rstofer:
Right, your units are way wrong. Note that your worksheet at the top right wants the voltage in terms of -100 mV. All you your signs are wrong, every output voltage is negative. That's one of the features of an inverting amplifier. It the - input goes up, the output goes down. The worksheet accommodates this by stating that you are to specify the result (apparently as an integer) in terms of -100 mV. If you calculate a value of 900 mV, the value is really -900 mV and after you clean up the sign and divide by 100 mV, you get just 9 as an integer. Remember, when the currents sum up at the - input, they flow through the 470 Ohm resistor from left (+) to right (-) and this leaves the right end of the resistor at a lower voltage than the left end. But the left end is at virtual ground or 0V so the right end of the resistor must be negative. I see the numbers are much different than the original problem of a few days ago. |
| nyame:
thanks, please kindly take a look at this, please is mV |
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