[sergey23 0]

Hello,I am trying to use AD8034 as a comparator,P12 is constant DC.
I put simple voltage divider to be in the minus of AD8034.
However when i connect the voltage divider to the minus of the AD8034 i get 1.6 instead of (12/30)*10=4V
Why the opamp ruins my voltage divider?
LTSPICE file is attached
Thanks.
double_delay_opamp_try.asc

[1113 7]

try use OPA with rail-to-rail input

[sergey23 0]

Hello , you mean to use a comparator?
Comparators have tendensy to need a pullup resistors because of open drain outputs.
could you reccomend me a comparator i could use and simulate whic does not have open drain output?
Thanks.

Изменено 7 сентября пользователем sergey23

[1113 7]

5 minutes ago, sergey23 said:

you mean to use a comparator?

i mean amplifyer not comparator but with rail-to-rail input.
your opa (AD8034) can not take input voltage more than 2V

[sergey23 0]

Hello , Could you reccomend me a model i could try and simulate?
Thanks.

[1113 7]

check lm324 for example

[sergey23 0]

Hello , I have two DC inputs,
how do I calculate common voltage and differential voltage from these inputs?
Thanks.

[dimka76 62]

On 9/7/2024 at 12:02 PM, sergey23 said:

could you reccomend me a comparator i could use and simulate whic does not have open drain output?
Thanks.

 

TLV1805, MCP6561, TLV7011, ADCMP371

 

google - comparator push-pull output