lyndon wrote: ↑Mon Jun 04, 2018 10:10 am
That said, I'm sure you could find a simpler 4-20mA converter online.
First, thank you so much for being un-greedy with your knowledge, generous.
Second, it's taken me about 10 years to find this thing.
Where might I look for a simpler 4-20ma converter online?
I might as well switch before I get started,
although I have already ordered some parts.
(Using 1-5v from a pic or arduino)
If this circuit does not work correctly. Does this mean I would
get my 4-20ma, but then have too much voltage reduction below 12vdc?
If this is correct, what would I need to change, the transistors or the resistors?
If I understand the circuit, at least partially, the 10K resistor network
is just used because it's a big resistance and because it matches the other 10K resistor.
I'm a little foggy on transistors. Is saturation, the point where the transistor
switches 'ON'? If so, I don't know how to select a more useful or correct transistor.
I'm in trouble when I try to venture beyond blinking the LED.
And all I remember is P=IE and E=AR. So when it comes to figuring out how
to select a transistor, it may as well be quantum mechanics.
Thanks for your generosity.