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Pingers and Hydrophones  - Page 2 EmptyFri Mar 15, 2024 4:36 pm by david f

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    3 posters

      Pingers and Hydrophones

      david f
      david f
      AMS Treasurer


      Posts : 2395
      Join date : 2010-11-10
      Age : 73
      Location : Cumbria

      Pingers and Hydrophones  - Page 2 Empty Re: Pingers and Hydrophones

      Post  david f Tue Apr 02, 2013 9:16 am

      Hi Marius,

      That simple amplifier looks very promising. Simple but has a preamp stage. Let us know how well it works.

      The original Loughborough University links don't work any more but this is the only one you need (for the hydrophone):

      http://www.lukemiller.org/journal/journal_pics/hydrophone/piezo_hydrophone_1995.pdf

      Let me know if this link does not work.

      David
      profesorul
      profesorul
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      Posts : 386
      Join date : 2011-07-03
      Age : 59
      Location : Bucuresti, ROMANIA

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      Post  profesorul Wed Apr 03, 2013 8:01 pm

      Hi,

      - I didn't find all the components yet but I wheel keep you on post it.
      - I found a small piezo ceramic speaker into an old toy,and I need to find the materials to do that Hydrophone,
      - that link is working,
      - what PIC can replace yours 08M2 (in my country NOBODY bring these PIC!).....the 16F84A is working?,or what other Microcontroler can be used?.....can You send the code for programing by eMail?....what is actualy the sound produce by Your device?.

      MARIUS
      david f
      david f
      AMS Treasurer


      Posts : 2395
      Join date : 2010-11-10
      Age : 73
      Location : Cumbria

      Pingers and Hydrophones  - Page 2 Empty Re: Pingers and Hydrophones

      Post  david f Thu Apr 04, 2013 10:09 am

      The simple piezo element will work well.

      The design you showed me is for an electret microphone. It should work with a piezo input. (I think a resistor could be removed that provides a voltage to the electret.) But try the original circuit first.

      The pic and its programmed software are available for £6 for AMS members only to purchase. (Hardly a fortune! I have granted the proceeds of the sale of the pic and software to the AMS and our charity the RNLI so I can't offer source code.)

      I can probably send you a recording of a PIC signal if you would like?

      David
      profesorul
      profesorul
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      Posts : 386
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      Post  profesorul Sun Apr 07, 2013 5:43 pm

      HI DAVID,

      I understand the complexity of the problem.

      Only yesterday I succeeded to find all the components for the device.Maybe next week I can find some spare time to do it.
      From what I understand there are 2 devices:
      - a)the sound emitter - witch is made by You and mounted in the sub,
      - b)the Hydrophone - witch form Your experience - all of as should have it at home!.

      PLEASE if You can send me the sound by email.
      I'll send You by PM my mail address.

      Regards MARIUS
      david f
      david f
      AMS Treasurer


      Posts : 2395
      Join date : 2010-11-10
      Age : 73
      Location : Cumbria

      Pingers and Hydrophones  - Page 2 Empty Re: Pingers and Hydrophones

      Post  david f Mon Apr 08, 2013 10:31 am

      Hi Marius,

      That is right. You need a long lasting sound source on the submarines. (Drive batteries go flat within hours.)

      I will send the Pinger sounds recorded at Barrow to Richard to see if he can upload them here.

      David
      profesorul
      profesorul
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      Posts : 386
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      Post  profesorul Mon Apr 08, 2013 6:20 pm

      OK,
      THANK YOU

      MARIUS
      profesorul
      profesorul
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      Post  profesorul Fri Apr 19, 2013 3:24 pm

      HI @david,

      I have a couple questions regarding these Hydrophone:

      - witch should be THE MAXIM difference between Piezo Diameter and O-ring diameter?...I have a 27mm diameter piezo and a 45mm interior diameter for the O-ring with 5mm thickness of the O-ring...it wheel be OK?;
      - I found only 3mm thick Plexiglas , can I use it?...or can I reinforce the Plexiglas by DOUBLE the sheets - to use 2 piece of 3mm glued togeder for each side to make it 6mm?....what adhesive can be used?,
      - is necesary to use ONLY the COAXIAL cable from Hydrophone to Amplyfier or I can use any good water proof cable?,
      - what should be the maximum length of the cable?

      That's wheel be all for know!.

      THANK YOU

      REGARDS MARIUS
      david f
      david f
      AMS Treasurer


      Posts : 2395
      Join date : 2010-11-10
      Age : 73
      Location : Cumbria

      Pingers and Hydrophones  - Page 2 Empty Re: Pingers and Hydrophones

      Post  david f Sat Apr 20, 2013 9:15 am

      Hi Marius,

      I don't think a Loughborough University "bender" hydrophone is very fussy as far as materials are concerned. It works like a drum and so will have a resonant frequency but what you have described will probably be OK.

      Coaxial is better to eliminate main hum etc. but there is not much mains hum by the side of a pond! Twisted cables may be well be OK.


      David
      david f
      david f
      AMS Treasurer


      Posts : 2395
      Join date : 2010-11-10
      Age : 73
      Location : Cumbria

      Pingers and Hydrophones  - Page 2 Empty Re: Pingers and Hydrophones

      Post  david f Mon Apr 07, 2014 11:08 am

      Hi All,

      The news items about the loss of the MH 370 airliner prompts me to remind model submariners about are very own Pinger beacon, to locate lost subs.

      Lots of information on the Forum and you can still buy the AMS Pinger chip for £6.

      I don't seem to hear the cheery Pinger "chirp" very much on other peoples subs nowadays so they are risking just going home with their transmitter. Unless they are lucky enough to only operate in gin-clear water which must limit their hobby rather.

      As the experts say it is not IF you lose your sub but WHEN!

      Just a gentle reminder warning for the start of the season.

      David
      John Wrennall
      John Wrennall
      AMS member


      Posts : 157
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      Location : Leyland

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      Post  John Wrennall Sat Mar 21, 2015 8:38 pm

      Hi David.

      I have an old Walkman tape cassette unit which is now redundant and was thinking of using it as a
      Pinger receiver by simply removing the playback head and soldering in the transducer head cable.

      Its nice and compact but have you any thoughts as to its electrical suitability?

      cheers

      John

      profesorul
      profesorul
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      Post  profesorul Sun Mar 22, 2015 8:46 pm

      I'm interested too .
      I think I steel have some were a Walkman tape cassette with his original helmet ! .

      Yap , I know I'm a sentimental guy !.

      MARIUS
      david f
      david f
      AMS Treasurer


      Posts : 2395
      Join date : 2010-11-10
      Age : 73
      Location : Cumbria

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      Post  david f Mon Mar 23, 2015 2:36 pm

      Just try it. You are not going to do any damage!

      The more hydrophones floating about the better (See my other post today!)

      Piezo elements are fairly "high impedance" but a lot of reasonably sensitive audio amplifiers will do the trick.

      The sort of sensitivity you are looking for (with the hydrophone element on a table) lightly tapping or scraping the table should give a noise over the headphones. (Headphones are always better, for some reason.)

      David

        Current date/time is Thu Mar 28, 2024 10:01 am