Hi you all: Just wanted to tell you that weve tryied the circuit (second version) and it works quite well. We have been able to hear through a speaker the heartbeats. It sounds quite well although it is very noisy so we have to stay still and quiet in order for the circuit to work well... ;D
Ive got a doubt about the circuit... ¿what are the reasons for having a High Pass Filter in U1a of 97 Hz and then a Low Pass Filter (Sallen -Key configuration) of 645 Hz.? wouldn't be better to just put low pass filters? or are trying to do a "band pass" filter? thats all, thanks for the help in your posts and the time to post a new improved version ;)
login
Electronic Stethoscope
in Projects Q/A
Posted
Hi you all:
Just wanted to tell you that weve tryied the circuit (second version) and it works quite well. We have been able to hear through a speaker the heartbeats. It sounds quite well although it is very noisy so we have to stay still and quiet in order for the circuit to work well... ;D
Ive got a doubt about the circuit...
¿what are the reasons for having a High Pass Filter in U1a of 97 Hz and then a Low Pass Filter (Sallen -Key configuration) of 645 Hz.? wouldn't be better to just put low pass filters? or are trying to do a "band pass" filter?
thats all, thanks for the help in your posts and the time to post a new improved version ;)