+ 5v
|
,
\
R1 /
\
/
to '
ADC | C
<------+-------|(---- ac input
|
,
\
R2 /
\
/
'
|
__
\/
Post a schematic of what you have. The offset can probably be added to the existing circuitry.tofinhk said:Sorry I haven't give too much information
My project is to receive signals from a transducer. Actually what I concern is 0-80Hz only. So it is really low frequency. The ADC I used can receive 0-5V and I can't change the ADC. The voltage from the transducer is ±7V. But I don't want the higher voltage. What I concern is ±0.1V. So, I amplify the signals by 25 times. The signals I want is now ±2.5V. Due to the limitation of my ADC, I want to add the offset voltage to the AC signal by 3.2V in fact. After that, I will use a diode to block the negative signal and then to the ADC.
Thanks again.
If I amplify the signals first, the signals become DC instead of AC, and the filter can't work as my expected.
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