Bill Jeffrey schreef in berichtnieuws
...
Bianca wrote:
For a project I need to have a controlled current of 20mA (tolerance
abt 10
%) for connection at the output of an IC that is giving a 1 Hz pulse,
voltage between 5 and 12 VDC, as low-cost and easy as possible...

The next component connected to that output will die if it must eat more
than those 20mA.

Do you actually need a constant current device? Or do you just need
some way to ensure that the current cannot exceed 20 mA?


More special: not above 20mA, not below 18mA...

Your description sounds like the latter, in which case the answer is
probably as simple as a resitor.


To variable, it will damage the thing that is connected.


Bill