Designing a doppler fetal monitor to monitor fetal heartrate

panic mode

Joined Oct 10, 2011
i can see several options:
- follow the link, (which does not go anywhere anymore)
- study that circuit design
- make your own design
- use search to find same or other designs
- hire someone to do design for you


Joined May 4, 2013
I found this (possibly) related project:
This circuit operates at 40 KHz which is not appropriate for a fetal heart monitor.

Look here for some basics on fetal heart monitors:

A couple of comments. Note that the transducer operating frequency is stated to be from 2 to 3 MHz. I expect that a lot of voltage gain in the receiver is needed -- something like 80 dB.