Hello Errol,
thanks for your answer. I was using a datasheet from Farnell, which doesn't include this page.
The OPA2137 seems to be an appropriate candidate, though I wished a wider temperature range - would you know another alternative here? The…
Thanks for your assistance. I've been encountering some issues regarding this filter. I am still experiencing op amp saturation (I did change the feedback loop from the earlier posted schematic to negative feedback) at the output of the first stage of…
I wondered if we might run into the issue of too much noise! For the op amp spots I think the OPA2137 or and OPA2170 might be good options. The OPA2170 is a low power CMOS part thats about 23nV/rtHz at 100Hz and a gain bandwidth of 1.2MHz (you don't mention…
Uli, I doubted the resistor tolerance and tested the circuit by hooking up the opamp inputs to ground instead of connecting them across the sense resistor, I got about 0.3mV output.
With a tolerance of 1%, the gain can vary from 9.8 to 10.2
The…
I built the circuit with the OPA2137, the dual version of the OPA137, and it worked. The accuracy of the secondary current was off a little. So I put a pot in place of the 50 ohm resister, and tuned it to 52.2 ohms. At 52.2 ohms, the current tracks the…
to User473,
I searched all the op amp portfolio with the parametric search (precision, general purpose, and high-speed). There are 6 options with temperatures of 150C and above (see attached). The best match is the OPA211-HT (210C max). This is the…
