How to get positive (+) voltage all the time.

[johnnykhor]

any idea how to get positive value all the time if i having a source which varying (DC) from positive to negative.

i need it, because i am connecting my sensor output into a microchip for ADC conversion, and it will run error if i supply negative analog signal.

thanks in advance.

 

[kabiru]

Hi, what about bridge rectifier circute.

 

[rakesh045]

how about applying a small dc shift such that the resultant waveform is always in positive voltage. another idea is using clamping circuit

 

[johnnykhor]

thx for reply.
however, my source is DC, the varying output was the unstable result from my sensor, but not AC.

i thought both bridge and clamp are for AC?

 

[keith1200rs]

We need more information. The nature of the signal is not clear to me. Is it a signal with a -1V to +1V range, for example, and you need to measure the whole range?

If the signal is 'unstable' you might need to fix it first depending on what you mean by unstable.

Keith

 

[siongboon]

Hi,

You must be trying to sample the analog signal.
How about shifting the signal to the range that can be accepted by your ADC.?
This is a common problem, so I think there will be many solution to this.
I believe there are also ADC that can helps you with this signal that you have.

Best Regards,
Siong Boon