# Constant voltage increment circuit

Discussion in 'General Electronics Discussion' started by Yogesh Baj, Sep 25, 2017.

1. ### Yogesh Baj

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0
Sep 25, 2017
I am a civil engineer and hence dont know anything about electronics so please help me. I need a circuit or a device which increases voltage for -250mv to +250mv at a rate of 0.1 mv/second

2. ### AnalogKid

2,476
714
Jun 10, 2015

Are you talking about a circuit that takes in input voltage of -250 mV and translates it to an output voltage of +250 mV?

Are you talking about a circuit that produces a voltage ramp from -250 mV to +250 mV?

Something else?

If the circuit has an external input, what is that input coming from? A sensor of some type, another circuit, etc?

What does the output of the circuit do? Does it drive a motor controller, an alarm system, etc?

ak

3. ### BobK

7,682
1,688
Jan 5, 2010
"increases voltage ... at a rate of...." sounds like a description of a ramp to me.

My questions would be:

What starts the ramp?
What does it do after it hits the max?
What is the load on the output?

Bob

4. ### Yogesh Baj

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Sep 25, 2017
input voltage can be any constant power supply source but the output voltage should be a increasing voltage at the rate of 1mv/sec starting from -250mV and ending at 250mV.

5. ### davennModerator

13,793
1,938
Sep 5, 2009
1mV / sec or 0.1mV / sec as in your first post ?

the more you help us, the easier it is for us to help you

6. ### Yogesh Baj

6
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Sep 25, 2017
0.1mV/sec would best but is this is not possible then 1mV/sec can also work.
Actually there are three electrodes in a conductive liquid I have to apply a voltage which increases at rate of 1mV/sec or 0.1mV/Sec (which ever possible) between 1 and 2 electrode and measure current between electrodes 2 and 3 every second. After it hits the maximum voltage the i will change one of the electrodes with another sample and repeat the same process . And so on with different samples. And by getting the voltage and current readings I have to plot certain graphs and do further calculations for my project. I have a device that can measure current so I just need a voltage source which increases as per my requirement mentioned above.

7. ### Yogesh Baj

6
0
Sep 25, 2017
Actually there are three electrodes in a conductive liquid I have to apply a voltage which increases at rate of 1mV/sec or 0.1mV/Sec (which ever possible) between 1 and 2 electrode and measure current between electrodes 2 and 3 every second. After it hits the maximum voltage the i will change one of the electrodes with another sample and repeat the same process . And so on with different samples. And by getting the voltage and current readings I have to plot certain graphs and do further calculations for my project. I have a device that can measure current so I just need a voltage source which increases as per my requirement mentioned above.

8. ### Yogesh Baj

6
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Sep 25, 2017
I don't understand what ramp is
After hitting max it should reset and carry out the same process but with different sample

9. ### AnalogKid

2,476
714
Jun 10, 2015
Sounds like a potentiostat.

What starts the ramp? Press a button? A computer signal?

After one ramp. does the output sit at +0.250 V, return to 0 V, or what?

ak

10. ### Yogesh Baj

6
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Sep 25, 2017
A button and after one ramp is complete at +0.250 V it returns to -0.250 V then I connect a different sample and the ramp starts again from -0.250 V after pressing the button

11. ### davennModerator

13,793
1,938
Sep 5, 2009
and what tells it to start the ramp again ?
you will need a control process in there .... a microcontroller etc