Hi, I build Simple ECG circuit it works well. my problem is that when I disconnect cables from body output display 50Hz Noise with full scale peak to peak voltge 0-5volt. when I touch Metal part of circuit like USB output Noise reduce very well. I pulled up inputs with 10Mohm but again Noise is visible in the output and also Signal ratio decreased dramatically.
so how I can solved my problem that when cable are disconnect output goes to 0volt?
any help would be greatly appreciated