Designed the below circuit to have a 0.1 ohm shunt to detect the load on with 250mA current.
And load off without shunt current ( shunt voltage ) to drive the V out at low ( 0) voltage
Shunt voltage = 250mA x 0.1 = 25mV , with 1000K ohm to 10K ohm = 100 times
The voltage output should be 100 x 25mv = 2.5 Voltage
1) the V out resulted equal to zero ? Why ? Not 2.5V with 100 times 25mv
2) the inverting input should be 12V /2 = 6V , but it was 9.87V. Why?
3) Ideally, the non inverting input should be the same as inverting that was 9.87V. But it was 6.99V. Why ?
And load off without shunt current ( shunt voltage ) to drive the V out at low ( 0) voltage
Shunt voltage = 250mA x 0.1 = 25mV , with 1000K ohm to 10K ohm = 100 times
The voltage output should be 100 x 25mv = 2.5 Voltage
1) the V out resulted equal to zero ? Why ? Not 2.5V with 100 times 25mv
2) the inverting input should be 12V /2 = 6V , but it was 9.87V. Why?
3) Ideally, the non inverting input should be the same as inverting that was 9.87V. But it was 6.99V. Why ?