J johnkaz77 New Member Jan 11, 2012 #1 Hi everyone! I found this circuit which is supposed to be offset voltage adjustment, can anyone tell me what's the gain of the upper amplifier? Thank you. Last edited by a moderator: Jan 15, 2012
Hi everyone! I found this circuit which is supposed to be offset voltage adjustment, can anyone tell me what's the gain of the upper amplifier? Thank you.
crutschow Well-Known Member Most Helpful Member Jan 11, 2012 #4 alec_t said: Gain = (R18+R20)/R20 = 3.2 Click to expand... Check your math.
ericgibbs Well-Known Member Most Helpful Member Jan 11, 2012 #5 crutschow said: Check your math. Click to expand... (2200+1000) = 3200 ,,, 3200/1000 = 3.2 I prefer the usual way G+= 1+ 2.2k/1k = 1+ 2.2 = 3.2
crutschow said: Check your math. Click to expand... (2200+1000) = 3200 ,,, 3200/1000 = 3.2 I prefer the usual way G+= 1+ 2.2k/1k = 1+ 2.2 = 3.2
crutschow Well-Known Member Most Helpful Member Jan 11, 2012 #6 ericgibbs said: (2200+1000) = 3200 ,,, 3200/1000 = 3.2 I prefer the usual way G+= 1+ 2.2k/1k = 1+ 2.2 = 3.2 Click to expand... You are correct. I misread the schematic resistor value.
ericgibbs said: (2200+1000) = 3200 ,,, 3200/1000 = 3.2 I prefer the usual way G+= 1+ 2.2k/1k = 1+ 2.2 = 3.2 Click to expand... You are correct. I misread the schematic resistor value.