Rail-to-Rail Output The approximated output resistance of the LMC6462/4 is 180Ω sourcing, and 130Ω sinking at VS = 3V, and 110Ω sourcing and 83Ω sinking at VS = 5V. The maximum output swing can be estimated as a function of load using the calculated output resistance.
No, not "U2 In+" --> use "U4 In-".I added 100k in series from LM4041 to U2 In+
No, not "U2 In+" --> use "U4 In-
"The circuit" won´t drift, but the battery voltage. And you connected R27 to the battery voltage, so the Opamp output will drift, too.1a) Will a circuit like this always leak/drift
is the use of a tiny, low power microcontroller too drastic? .... it may reduce the part count to only 10%, maybe less. Without performance loss.2) What is bad/naïve amateur design here, where could it be improved without too many drastic changes?
There already is a buffer.. why don´t you use it?3) Will adding a buffer op amp from Node 1 to the comparator
Hi,
1a) C5 will drift :-( Self discharge, leakage currents on the PCB, leakage currents by connected circuitry.
3) Connect U6_IN- to U1_out. U1_out is stable. Improves C5 performance. I see no drawback.
5) yes, try. Give feedback.
Klaus
Did you try the 1k resistor that I recommended in post#3?
This whole design could be done on a single chip mixed signal processor, and the requisite de-
glitching handled. If I understood the inputs and their relationship to the outputs I could show
a basic design I think. Quite possibly with little or no code needed.
Alternatively a small 8 pin processor could be added to produce a delayed switch action, just using
on chip clock generation, only external component a bypass cap for the chip.
The AM inputs fed to the mirrors, whats purpose of mirrors, to sum currents into C5 ?
Regards, Dana.
So you have an up & dwn input to raise or lower LED brightness.
Then if no button is being pressed the led brightness ramps down over a fixed time,
from what it was after buttons were no longer being pressed.
I understand the current source. What is the top sig chain doing U10 thru T6, I see the
same V from C5 thats being fed to the LED current driver is going to the upper sig chain.
What is that for ?
Range of LED current needed ? Time C5 discharges to turn LEDs completely off ?
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