Re: [EE]: Bi-Directional 20A current shunt Using Single supply OPAMP

Is the shunt set in stone or could you consider one of the current sensors
with built in conditioning like the INA2xx range?

Clint. M0UAW IO83

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On Fri, 12 Sept 2025, 03:46 Justin Richards, <[email protected]>
wrote:

> I would like to condition the output of a 1.1mV/A current shunt to drive
> the analog input of a WEMOS D1 Mini (0 - 3.3V).
>
> The target application is easy monitoring (wifi) of anything 12V with an
> Anderson plug. i.e. Vehicle to Caravan charge line, Solar Panel to Battery,
> Battery to Electric Blanket/Fridge etc.
>
> The device is to be powered from the circuit it is monitoring which will be
> around 12.8V.
>
> I am a long way from a bench so have resorted to LTspice.  The attached
> circuit (5KB so I hope it gets thru) appears to behave exactly as desired.
>
> However, 2 diodes in series to raise the reference to allow for the
> negative swing seems to work in LTspice but I am curious what others think
> about this approach.
>
>
> Justin
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