Yastreb & Breadboarder
Yastreb Yastreb
Breadboarder Breadboarder
Breadboarder Breadboarder
I was just rewiring a 741 op‑amp with a precision 10‑k resistor ladder, but I keep hitting an offset of about 2 mV. It feels like a shot in the dark—maybe you’d see a way to make it hit the mark?
Yastreb Yastreb
You’re missing two things – the bias current of the 741 and the resistor tolerances. Use a modern low‑offset op‑amp and a matched 0.01 % ladder, then add a small offset null to fine‑tune. Make sure the bias current path is symmetric so the offset cancels. If you keep the 741, add a dummy resistor at the non‑inverting input to balance the bias. That’ll drop the 2 mV to sub‑milli‑volt territory.