I am presently working on a project to develop an ultrasonic doppler fetal heart rate monitor.
I have a doubt in the first stage of this project i.e the data acquisition part

This is the transmitter part
DOUBT- What are the specifications of the transformers T1 and T2 in this fig, these transformers have to be small so that they can be soldered on a pcb becoz the final device has to be portable.

DOUBT- same as above I need specifications (winding ratios) of transformers T3 and T4

NOTE: This PDF explains construction and working of this ckt you can use this for reference http://blockyourid.com/~gbpprorg/mil/ultra/Build_This_Doppler_Ultrasound_Monitor.pdf

please reply fast

thank you

 

All the components are in the parts list. The manufacturer of the transformers may give the winding ratios.