Designing a doppler fetal monitor to monitor fetal heartrate

panic mode

Joined Oct 10, 2011
1,882
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
 

RichardO

Joined May 4, 2013
2,271
I found this (possibly) related project:
https://web.archive.org/web/20121023010026/http://blockyourid.com/~gbpprorg/mil/ultra/index.html
This circuit operates at 40 KHz which is not appropriate for a fetal heart monitor.


Look here for some basics on fetal heart monitors:
https://en.wikipedia.org/wiki/Doppler_fetal_monitor

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.
 
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