Electronics > Projects, Designs, and Technical Stuff
Constant current source adjustable by PWM
delphes123:
Dear
I would like to get Constant current source, but the level of current needs to be adjustable (from 0 to 20 MA approx), I need to have very low cost of BOM, best is to avoid OP Amps if possible.
R3 is the charge where I need constant current.
The idea is to replace V2 source by MCU PWM output
How this schematic could be improved? Does Q2 needs to be replaced by Mosfet ?
Thanks
paulca:
20MA ... that's a lot of current! I assume you mean "mA".
schmitt trigger:
Why are you against using an opamp? Why are you restricting the use of a component which will make your life easier and performance better?
delphes123:
Yes sorry typo is mA of course
delphes123:
Not using OP Amps is mainly cost problem with this project, but if there are no solutions why not ?
Navigation
[0] Message Index
[#] Next page
Go to full version