I am going to use a regular solderless breadboard. when I built the upper section on breadboard the circuit configuration was a little bit different. there was no buffer between first stage and the last one. besides configuration of last stage was different. Resistor at the output of current mirror wasn't connected to the ground and Non inverting pin of last op amp was grounded. In this kind of configuration, circuit began oscillating. I add the buffer when I assemble it again but should I keep non inverting pin of the last op amp grounded or not?
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