About a week ago I had an idea to build a computer EKG using the computer's mic input as a signal input. One of the most complete tutorials I found on the internet was this one (that is applicable on ECGs also). Here is a view of the circuit:
The first part is an AD602AN amplifier (very common on EKG circuit). All the other op-amps are filters:
-first: 60hz noise cutter
-second: galvanic current (from the skin) cutter
-third:I don't know if it is necessary for an EKG(see link for more info)
-fourth: I think its something related to gain adjustment
-fifth: again, a 60Hz noise cutter
I have some questions:
- Is there any useful changes on the circuit given that it was primarily built for an EEG, not ECG?
-In case I want to "skip" some filter in the circuit, can I add a switch that will make the signal pass through the filter or directly to the next filter(alternator) without any kind on loss?
-Any recommendations al all?