Didn't really notice the formula they have written above Rf.Hey Marshallf3,
I was talking about the current I = I1 + I2 + I3.
Vo = - I * RF
How do 'I' return to the ground, if the output is connected to nothing?
No, just realize where the current is coming from. It comes as a result of the input voltages pushing it through the input resistors. Bigger resistors mean less current in the same way that less voltage would.If I like to decrease voltages, shall I just connect an inverter op-amp to each desired input?
Hey,No, just realize where the current is coming from. It comes as a result of the input voltages pushing it through the input resistors. Bigger resistors mean less current in the same way that less voltage would.
Look at the gain equation for a summing amp. Things like Vx/Rx ...
Inverting op amp the voltages will still equal the sum, polarity will just be negative.Hey,
Sorry for my mistake,
I meant if I like to subtract voltages, shall I use an inverter op amp at each desired input?
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Duane Benson