Doppler ultrasonic transducer

Discussion in 'The Projects Forum' started by projecthelp, May 4, 2011.

  1. projecthelp

    Thread Starter New Member

    May 4, 2011
    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

    please reply fast

    thank you
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    All the components are in the parts list. The manufacturer of the transformers may give the winding ratios.