I need a constant current source between 0 - 75mA. My idea was to connect three OPs of the PSOC 4 parallel. As current source i would use the IDAC. I add a frist schematic as appendix.
The values of the resistors in the schematic are not correct. It's only a idea, when the thing is working i will calculate the correct values.
Have a good day...
PSoC devices are not a power source, for 75 ma output you need external power component, like a FET. Also, output voltage of Opamp based current source will be lower than ~3V.
Please take a look on schematics in this thread (current sink)
And this one (current source)