LM311

What do with the BALANCE and strobe then the strobe is low the chip is off so I pull it high.
With a resistor but a can't seem to find anything showing how to use them.

according to the description in the datasheet:
"If the strobe is low, the output is in the off state, regardless of the differential input."
I guess it can be used like an enable pin, but I don't know why it is referred to as a "strobe."
source:
https://www.ti.com/lit/ds/symlink/lm311.pdf

don't connect to balance and strobe. The will work no connect.

Please show how you connected pins 8,7,1,4.
The output(s) is/are complicated and probably the problem is there.

I never used it before but I posted in post one that it said if the strobe is low the chip is off and nothing about the BALANCE
it works with them floating. i just trying to figure how to use them.

Input(s) voltage range:
Stay 2V below VCC and 0.5v above VEE. (inputs)

The balance and strobe pins can be used for offset-nulling, e.g. by connecting them respectively to the two ends of a (250k or so) pot, with the pot wiper connected to the +ve rail.

Look at Figure 17 in the data sheet.

crutschow said:

Look at Figure 17 in the data sheet.

Click to expand...

I missed that so for my needs Ill just leave it floating worked really good thanks all Burt

The LM311 was one of the first high speed comparators to be introduced way back in the 1970s. It has a response time an order faster (165nS) than the other early common comparators, the LM393 (dual) and LM339 (quad) (1.3uS).
LM311 data sheet: https://www.ti.com/lit/ds/symlink/lm311.pdf
LM393 data sheet: https://www.ti.com/lit/ds/symlink/lm2903-n.pdf
LM339 data sheet: https://www.ti.com/lit/ds/symlink/lm2901-n.pdf

While the LM311 is a very useful chip, it can misbehave if great care is not taken with the circuit design and physical layout: https://www.ti.com/lit/an/snoa860/snoa860.pdf

Sorry to be a doom monger.

spec

(PS: it is odd that the data sheet describes the LM311 as a quad comparator when in fact it is only a single. Over the years I have written to National Semiconductor and subsequently Texas Instruments about this but have never got a reply- am I missing something?)