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Sorry, I meant I turned the pot mostly towards zero resistance. I've not measured the output amplitude properly during typical use with the foam on, but I'd shot for about 300mV peak-to-peak at zero

Regarding this Figure-8 mic, it has an undamped membrane, meaning the frequency response has a +6dB/decade slope. The datasheet is a bit misleading, showing a "Typical *Omnidirectional* Frequency

You can order PCBs from PCBWay - link in Jules' instructable - and order the components locally. It's easy to build. Be advised - the default quantity in the order form is 5 pieces. But 10 pieces cost

I'd love to build the Gladys Hydrophone. Any chance to get the parts or DIY kit in Europe? Udo Jules Ryckebusch via groups.io:

I recently discovered many small and very old ponds and would like to take a listen. Some are very small. I will try your suggestion. I would find it a bit of a schame to use Jule's well-built

Two omnidirectional capsules may result in some directivity, but polarity and level must be adjusted.

It looks like a piezo disk microphone. It's easy to build one for a handful of dollars. To make them watertight I use nail varnish instead of the more common plastidip. Be aware you should use an

It's a bi-directional microphone, a.k.a. Figure-8. No, it's not. Two omnidirectional capsules oriented in whatever direction always result in omnidirectionality. What you suggest would be two

Hello all. I found this group while searching for directional microphones. Especially for an headset similar to the one in the above post for the aircraft. Do you know the mic level you need for the

In this case, the nature of the transducer (dynamic, electret or condenser) does not make a difference. It's only the distance that matters. Putting the mic as close as possible to the source

Hi Johan Many thanks for your advice. I have a modest question. I own a Shadow SH SV2 Violin Dual Transducer ( https://shadowelectronics.com/products/sh-sv2 ) (12mm). It sounds quite nice. Even on a

sorry, I see I misunderstood your question. As Jerry Lee Marcel says it's difficult. The microphone is not intelligent to make an interpretation of the distance. In live radio, they sometimes opt for

"Short pick-up range" does not exist. Sound propagates with attenuation that is related to distance. There is nothing like a distance where sounds magically disappear. Directive microphones allow

Hello, Your message sounds a bit like a contradiction to me. The best lows you will get from an omnidirectional capsule are often way lower than what we hear. On the upper range, most go into

hi all - i'm wondering if anyone has any suggestions for electrets (or possibly other forms) with an extremely short pickup range. i'm looking to do some experiments and i want to minimize all

I have built electret hydrophones in the past. They have serious limitations. Noise/sensitivity is one. Another is the huge change in pressure on the (protected) membrane when passing from air to

Thanks, Jules! I'm sure Gladys will work well in ponds. Don't you have a pond nearby? Please dipp one of your Gladys in and tell us how it sounds. Maybe you'll discover something interesting. That

Heinz, these will work fine in a pond. They are designed almost identical to a NOAA paper on them and, like Naval Hydrophones. I have not measured the sensitivity but they are very low noise as well.

Digging a little deeper, I found that the hydrophones that David Rothenberg uses for his pond recordings were originally invented and built by Zach Poff. When it comes to hydrophones, Zach Poff has

Hi Jules First of all, thank you for your post and the instructions you put together to build these amazing Gladys hydrophones. Your humpback whale recording on YouTube is fantastic! Did you ever