edofbrighton
Member
The ADC i'm using doesn't convert the voltage i put on to it, can anyone explain why? The voltage is obtained from a series of op-amps used to get the output from a bridge. It's designed correectly. If i connect a vm across it, it gives the right voltage, but when i use the pic to digitlise it i get a voltage of zero. I wonder if this is because the current supllied by the op-amp is to small too charge the capacitor in the sample and hold for the pic. The ADC works if i connect it to the supply rail to it. Does anyone has any experience of similar problems?
circuit:
bridge-two buffer(voltage follower op-amps)-diferential op-amp-lowpass filter-final buffer (another voltage follower).
cheers,
ed.
circuit:
bridge-two buffer(voltage follower op-amps)-diferential op-amp-lowpass filter-final buffer (another voltage follower).
cheers,
ed.