Hello,
I am trying to build a usable ECG for some music project.
By scouting round Internet, most projects seem to be using an instrumentation amplifier.
So far I have no form of analogue filtering, as just want to make sure the instrumentation amplifier is working correctly. However, after applying considerable digital filtering I still can't monitor the peeks analogous to heart contraction.
From a previous experiment (connecting the electrodes to a simple gain stage then connecting them to my sound card, recording, and filtering) I was able to monitor the wanted signal just by applying digital filtering.
So I used this schematics
I have R=100k , Rgain = 470k potentiometer.
And am using 741s opamps.
The main problem for the moment seems to be that I'm getting a negative voltage at the output of my instrumentation amplifier. What I'd like is voltage varying between 0v- 5v.
If anyone could help the inexperienced me, that would be great.
thank you.
I am trying to build a usable ECG for some music project.
By scouting round Internet, most projects seem to be using an instrumentation amplifier.
So far I have no form of analogue filtering, as just want to make sure the instrumentation amplifier is working correctly. However, after applying considerable digital filtering I still can't monitor the peeks analogous to heart contraction.
From a previous experiment (connecting the electrodes to a simple gain stage then connecting them to my sound card, recording, and filtering) I was able to monitor the wanted signal just by applying digital filtering.
So I used this schematics
I have R=100k , Rgain = 470k potentiometer.
And am using 741s opamps.
The main problem for the moment seems to be that I'm getting a negative voltage at the output of my instrumentation amplifier. What I'd like is voltage varying between 0v- 5v.
If anyone could help the inexperienced me, that would be great.
thank you.