# Amplifying output signal from 5V using load cell

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#### mf1364

##### Full Member level 3
hi dear friends
i have a load cell and i want to amplify output signal from 5v,that mean i want when i push load cell the output signal increase than +5v and when i pull it the out put signal decrease from +5v . i try several circuit for that but i cant earn any good result .do you have any practical circuit for me?

#### kender

What types of circuits have you tried? What results are you getting?

If I understand you correctly, it looks like you want to have a digital output: 0V if the force is blow a certain threshold, +5V if it's above the threshold. You would need a to have comparator somewhere in your system.

#### Prototyp_V1.0

If kender is right, I guess you need a difference amplifier (opamp) and a schmitt-trigger (also opamp).

Combine those two

#### mf1364

##### Full Member level 3

Prototyp_V1.0 said:
If kender is right, I guess you need a difference amplifier (opamp) and a schmitt-trigger (also opamp).

Combine those two
tanks for your guidance but i think your circuits is not practical , and i tried with some
op amp circuits and i could amplify the output signal but i want output changes from +5volt , you know i want a practical circuit that can control and amplify output together. :|:|:|:|:|:|

#### Prototyp_V1.0

I'm not sure I fully understand the problem. A tip is that ground symbol on the substractor circuit doesn't need to be 0 volt.

Another thing is that you might need an instrumental amplifier.
https://en.wikipedia.org/wiki/Instrumentation_amplifier

In my first reply I added a schmitt-trigger, but I don't know if you really need it.

Maybe if you explain once more the aplication of your circuit, I can help. Eg: What voltages does your load cell output (in details)? And what output voltages do you want? 0-5Volts?

##### Full Member level 6

DEar fellow,

i did this project 3 years ago, i used Instrumentation Amplifier .... u can use any instrumentation amplifier from Analog Devices

i developed this for Cement factory,

~AM

#### jit_singh_tara

##### Full Member level 6

you need a instrumentation amp for this .... because load cell max output woukd be say 10mV , for full scale deflection . u need ad7796 to amplify the signal ....... and then convert from adc ........go for ad7796 datasheet.... everything will be clear.........

#### mf1364

##### Full Member level 3

Prototyp_V1.0 said:
I'm not sure I fully understand the problem. A tip is that ground symbol on the substractor circuit doesn't need to be 0 volt.

Another thing is that you might need an instrumental amplifier.
https://en.wikipedia.org/wiki/Instrumentation_amplifier

In my first reply I added a schmitt-trigger, but I don't know if you really need it.

Maybe if you explain once more the aplication of your circuit, I can help. Eg: What voltages does your load cell output (in details)? And what output voltages do you want? 0-5Volts?
hi ,
i have an model uu-k100 ,that has 10mv-50mv out put but you know i want amplify signal around 0-10v and when i pull or push(Press) it i want to have out put signal changes from +5volt.
for example :this cell when i press it powerfully output is around -4mv and i want convert it to a number below +5v(until 0v ) and too when i pull it powerfully output is around 50mv i want convert it to above
+5v(until 10v).

Added after 1 hours 56 minutes:

DEar fellow,

i did this project 3 years ago, i used Instrumentation Amplifier .... u can use any instrumentation amplifier from Analog Devices

i developed this for Cement factory,

~AM
hi
i tried this circuit in https://en.wikipedia.org/wiki/Instrumentation_amplifier but unfortunately i had no success and output signal had not any change after 7oKgf .
and i want it changes until 100kgf linearity.
can you send your circuit for me :?:

#### mf1364

##### Full Member level 3

Any Body Help me??????
plz help me .................
i try,,,, make this amplifier with AD524 but i dont have any good result.......

my problem in this circuit (Ad524) is noise......

it means that output of my circuit have noise and a-stable........

help me plz..................

#### Prototyp_V1.0

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