I'm designing a bidirectional current monitor circuit for my SLA battery fuel gauge
I found 2 designs for this in two application notes of National & Liner
I modified these designs as follows:
1- RO1 & RO2 are pots to scale the output.
2- D1 & D2 to feed the A/B part to zero when B/A measures high current.
The circuit works fine under simulator
In real life..
1- Both outs gives output when no load, It may be the amp offset (It's not a problem).
2- When a load attached the corresponding out decreases while it should increase as it do in simulator !!
I don't know why it doesn't run as in simulator
Can anybody help ?
Thanks in advance.