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thank you for your help.
i am planning to use it to reduce offset, i was just wondering how come offset reducing works when offset N1&N2 are connected to negative rail. but for now, it's enough for me, i'm gonna jump to some testing... :)
kind regards
i'm sorry, i left out the context. i'm building a non-inverting low pass filter using TL081, and i'm planning to use it as a voltage follower with RC circuit on the input.
now when you know the story, do you think that i will be able to shift the signal more than 20mV with that offset circuit...
so for example,
if IN+ = 5V, IN- = 3V, the resulting signal will be 2V and I will be able to shift that resulting signal up or down using the offset adjustment configuration from the datasheet?
Hi,
in the TL081 datasheet there is a circuit for input voltage offset adjustment.
i don't understand why are offset N1 and offset N2 pins connected to a negative voltage(through a pot)?
if IN+ and IN- pins are both positive, will I be able to adjust the offset
with that offset adjustment...
Hi,
I have a load cell setup with ina125 the way datasheet says. Everything works good, but I can't seem to figure out why is output not amplified like formula says.
Formula says: Gain = 4 + (60k/Rg)
My setup:
Rg
Input(mV)
Output(mV)
119 Ohm
0,2
27,3 -> but output should be 101,64...
Hi all,
I'm using PIC18F45K22 to do A/D conversion of signal from INA125. I want to set external VRef +/- on PIC to be equal to the precision voltage reference of INA125.
Can I connect it directly and do I need to pay attention to PIC VRef+/- input imedance?
Kind regards
I have 2 load cell parts, one for 1kg and the other for 200kg. The 1kg load cell works good with pins 4&15 shorted, but the 200kg load cell gets the precision reference to drop a little. That is the reason I use attached scheme in which they propose the use of TIP29C if the precision reference...
INA125 and EasyPic v7 ADC VRef+/-
Hi all,
For A/D conversion I'm planning to connect INA125 5V precision voltage reference to VRef+ on the EasyPic v7(onboard is PIC18F45K22) board and GND to VRef-. INA125 setup and EasyPic v7 board have each own power supply. There's a circuit from INA125...
1. From LM317 datasheet I found the circuit that is in the attachement. If I calculate right, the resistor should be >1.2k to get current of about 100uA, but the datasheet specifies that resistor R1 must be between 0.8 and 120Ohm's.
How can I achieve 100uA current?
2. I can't figure out how...
Thank you for clarification!
I just searched for REF200 on several of my local dealers pages and could't find one, how good is LM334 replacement?
Can somebody please suggest what other options do I have?
King regards
Hi all,
INA125 offset circuit from datasheet is in the attachement. I have some questions about it:
1. what do "100uA" and "1/2 REF200" markings mean?
2. can I use LM358 instead OPA237?
3. I built the circuit using LM358 with V+ = 10V, V-=-10V and those 100Ohm resistors got pretty hot, I don't...
if you change the Sine DC offset to 2V, the output is still the same!
that should not happen, because if the load cell S+ output has for example 10mV DC and some kind of AC component, the DC component will be ignored??? :?::?::?::?::?::?::?::?:
does not make any sense to me. I've attached a...
1. you need an extra resistors resistor connected between R6/R7 node and L2/R5/C2 node.
DONE
2.I would also change the values of R6/R7 divider to something in a region of 10s of kOhms.
DONE
3.Last thing is where is the load? The output is not connected to anything. Calculate the input...
I can't get it in simulation, I tried to build only DC offset of the circuit, but in my simulation result there is no DC offset, there are attachments in the post, please tell me, what is wrong with my scheme?
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