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Documents Hacked Fetal Detector Music Synthesizer -- Episode 375
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  • Author Author: tariq.ahmad
  • Date Created: 17 Dec 2018 6:18 PM Date Created
  • Last Updated Last Updated: 4 Jan 2019 8:24 AM
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  • Comments 12 comments

Hacked Fetal Detector Music Synthesizer -- Episode 375

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Hacked Fetal Detector Music Synthesizer

element14 Presents  |  MAYER MAKES VCP Profile  |  Project Videos

 

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Fleamarkets can hold a lot of junk but also treasures, Clem bought a 70's medical device which was used to examine the heartbeat of unborn children and hacks it into a retro style synthesizer.you can use your own heartbeat or even that of any person(born yet or not) to alter the sound of the device. It features a 10 Stage Sequencer and 5 different filters to create various sounds and rhythms.

 

Bill of Material:

 

Product Name Quantity
Buy Kit

555 Timer IC DIP8

3 Buy Now

SPDT switch 5A Panelmount

20 Buy Now
10 Turn Potentiometer 5kOhm 1 Buy Now

Decade counter/Divider IC

1 Buy Now

Knob Round 6mm / 50mmm with position marker

1 Buy Now

Quad Amplifier IC

1 Buy Now

Ansmann NIMH AA 1,3Ah 4-Pack

2 Buy Now

Resistor 10kOhm

10 Buy Now

Resistor 33kOhm

10 Buy Now

Electrolytic Capacitor 10uF

2 Buy Now

Electrolytic Capacitor 100uF

2 Buy Now

 

Additional Parts:

 

Product Name Quantity

Fetal Detector from the Fleamarket, or get a new one for cheap on the internet.

1

Order a wild selection of Caps and resistors to experiment around until you get the desired sound.

1

Differently colored wire to keep track of all the connections.

1

 





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Top Comments

  • mayermakes
    mayermakes over 7 years ago in reply to beacon_dave +2
    I actually made something similar to that a while back: : www.youtube.com/watch https://www.youtube.com/watch?v=CcfS_xI3Pdk it uses 2 555 timers and a FLed as a crude form of a 2 step sequencer, you can…
  • mayermakes
    mayermakes over 7 years ago +1
    Some facts were left onm the cutting floor: this is a fetal detector--> it operates with doppler radar not ultrasound ultrasonic devices were introduced for this purpose much later. the Filters are Simple…
  • beacon_dave
    beacon_dave over 7 years ago +1
    For some more fun with synths then I recall that there was an article in this month's HackSpace magazine (issue number 14), which may be of interest to some community members: https://hackspace.raspberrypi…
  • beacon_dave
    beacon_dave over 7 years ago

    For some more fun with synths then I recall that there was an article in this month's HackSpace magazine (issue number 14), which may be of interest to some community members:

    https://hackspace.raspberrypi.org/issues/14

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  • mayermakes
    mayermakes over 7 years ago

    Some facts were left onm the cutting floor:
    this is a fetal detector--> it operates with doppler radar not ultrasound

    ultrasonic devices were introduced for this purpose much later.

    the Filters are Simple low pass filterscreated with a ceramic cap and a resistor, the values were picked at random (trial and error)
    I listen to suggestions and yes I may try to incorporate midi in  this deviceor a future musical project.
    you can still check your heartbeat with it, bit it is very distorted.

    Dopplerradar is considerd non hazardous to any fetus. you canstill buy similar devices online cheaply.

    no pregnant women would let me try it out on their babys, but I use dmy own heartbeat and friends to test the functionality.

     

    It is very hard to create devent rythm patterns, it is like learning to play any other instrument.

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