Jus want to confirm that my "logic" was correct. I updated a schematic that offered 4 voltage indications to one that offers 7 indications. Have I correctly extrapolated? I added an additional lm324 and split the 680 ohm resistors in half to halve the voltage drops to their respective compactors.

 

 

Yes, I am aware of the LM3914, 15, & 16. They do not allow for precise voltages within the min & max I desire.

 

Hello,

What is wrong with the LM3914?
Did you ever look in the datasheet for the internal schematic?



It is almost like yours. It uses 1K resistors.
When you remove the bottom 3 leds and adjust the lowest led with the post, as in your schematic, on pin 4 it should work.
The reference voltage is on pin 6.

Bertus

 

Bertus,
I've looked at the datasheet quite a bit, but failed to focus much on the internal schematic. Pretty silly of me. I believe the current of all outputs can be changed as the datasheet details, but is it possible to adjust the current of individual LED's, by adding resistors(in this case - parallel?) You may have sold me, though the 3914's, 15's, & 16's are getting expensive and hard to find these days.

On the other hand, and 1 buck and a quarter, I could use this!

 

But if you are concerned about precision, accuracy, T and V effects,
is that module well characterized ?

Regards, Dana.

 

But if you are concerned about precision, accuracy, T and V effects,
is that module well characterized ?

Regards, Dana.

At that price I would assume NONE-OF-THE-ABOVE. But precision is not paramount for one application(want to monitor battery voltage for my mobility scooter so that the batteries are not "too discharged". The on-board bar display really stinks...displays green even when I need to get off the scooter and push it!