Hi... You all know I'm a software guy... I know enough electronics to do my job but on a recent repair to an older system I had an issue with the current convertor.... Its basically a simple op-amp voltage to current convertor, but with added circiuts.
The designer ( The old retired director of my old firm ) seems to have used up a quad op-amp package..
The input voltage is 3 to 4 volts... the output current measures 1.5mA to 2.5mA respectively
My question is what is the purpose of the feedback loops... Is one an over current, this is what it appears to be....
The job in question had fried R4.... instead of 243Ω we measured 6.7K... I'm trying to evaluate the issue so I can find out how it happened.
I hope someone can explain the circuit a bit better.
The designer ( The old retired director of my old firm ) seems to have used up a quad op-amp package..
The input voltage is 3 to 4 volts... the output current measures 1.5mA to 2.5mA respectively
My question is what is the purpose of the feedback loops... Is one an over current, this is what it appears to be....
The job in question had fried R4.... instead of 243Ω we measured 6.7K... I'm trying to evaluate the issue so I can find out how it happened.
I hope someone can explain the circuit a bit better.