Re: Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
Thanks Arjay. This is from the Data Sheet:
"Input pins are diode-clamped to the power-supply rails. Input signals that
can swing more than 0.5 V beyond the supply rails must be current-limited
to 10
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Jules Ryckebusch
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#36108
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Re: Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
On Tue, Feb 6, 2024 at 01:45 PM, Jules Ryckebusch wrote:
>
> I Just had a really cool adventure recording Humpbacks with my
> hydrophones. See this: https://youtu.be/XrURPtL9zuk
>
> One challenge
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Arjay1949
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#36107
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Re: Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
Hi Jules
Many thanks for sharing the video!
Yesterday I was (re)searching on the topic of bioacoustics and came across the following open access book that might be of interest to you.
Exploring
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Heinz
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#36106
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Re: Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
Thank you!
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Jules Ryckebusch
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#36105
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Re: Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
Awesome thank you so much!
Just read your publication on AES btw, great work!
wrote:
By
Dude
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#36104
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Re: Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
I am using Schottky Diodes 40V ones
https://www.mouser.com/ProductDetail/Diotec-Semiconductor/BAS40?qs=OlC7AqGiEDl%252BJK%252BMzfl3Mw%3D%3D
I based this on a EDN article on for input protection.
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Jules Ryckebusch
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#36103
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Re: Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
Hey there Jules, thank you for the update. I have put together many of your
boards since you started with the opa Alice, and I have just started with
the smaller piezo SMD boards, very lovely
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Dude
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#36102
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Input protection for OPA1642 for Piezo use. Oh, and Humpback Whales
I Just had a really cool adventure recording Humpbacks with my hydrophones.
See this: https://youtu.be/XrURPtL9zuk
One challenge was the failure of two of them post build. I also had a
couple board
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Jules Ryckebusch
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#36101
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Re: Reducing the sensitivity of electret capsules with built-in fet
I¡¯ll post some a link to the raw files and a reaper session later today
Best Regards,
Jules Ryckebusch
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Jules Ryckebusch
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#36100
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Re: Reducing the sensitivity of electret capsules with built-in fet
Jules,
Very interesting recording!
I have the impression that YouTube distorts the sound of the high tones of
the hi-hats.
Any possibility to listen the hi-rez audio of
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Andrzej Sochon
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#36099
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Hi kennjava
Thank you for your answer and the story about your binaural experiments! I sometimes record from vinyl and listen to cassette tapes in the car quite often. I have some cassettes that
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Heinz
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#36098
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Hi Heinz. Thanks for the follow-up, the pictures, and the link to the binaural review.
I didn't realize that the HM-200 incorporated a sort of pinnae or directional body shape. Interesting.
Yes,
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kennjava
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#36097
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Many thanks for your replies and your interest in this topic.
Because of the discovery of Johan (I don't perceive the typical hole in the middle¡) I would like to follow up a little.
I think it's
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Heinz
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#36096
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Dear Heinz,
One more thing...Wind is a nightmare, more sensitive capsules means more
wind sensitivity.
Wind-shields could help but may dump clearness.
Good luck with your experiments.
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Andrzej Sochon
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#36095
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Thanks for the kind words Heinz. Your recordings and the info triggered my
interest in (semi) binaural recordings again. I did experiments 15 years
ago with some Aevox Audio mics - a brand I rand for
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Johan Vandermaelen
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#36094
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Andrzej is wise, and if tho HM-200 still works properly, and? keeping it in?its original condition is important to you, then yeah, leave it alone....
If they were mine, though, would open them up
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kennjava
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#36093
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Many thanks for the information. You're right. I'm missing the foam windshields. I'll try building new ones.
The Victor HM-200 on eBay seems to be way overpriced. There's one on Yahoo Auction in Japan
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Heinz
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#36092
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Re: Vintage Victor HM-200 binaural headphone - How to open?
It appears this device is also known as the JVC HM-200e. more info on this site: https://www.audiovintage.fr/leforum/viewtopic.php?t=40732
I don't know if your specimen has the foam windsceens, that
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Pierre Olivier
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#36091
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Many thanks for your opinions. I really appreciate your thoughts!
Last year I read a lot about the World Soundscape Project ( https://www.sfu.ca/sonic-studio-webdav/WSP/index.html ) , Soundwalking
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Heinz
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#36090
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Re: Vintage Victor HM-200 binaural headphone - How to open?
Dear Heinz,
Listen to the timid advice of the old "fixer". If something is old and
works well, it is best not to disassemble it...
Your recording is great, I would like to have headphones like
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Andrzej Sochon
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#36089
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