I made a blog post about how to phantom-power this board: metalmarshmallow.com/blog_post.php?id=9

Awesome! I'll definitely be picking up one (or more) of these. I'm planning to make a noise box and hydrophone, so these will be incredibly helpful for those projects.

I'm a big fan of your work!

Thanks for your detailed explanation!

Thanks, my team trying to make sound on the robot. It is lovely.

I'd love to use this ina DIY hydrophone project.

Video about selling product, it's not guide or advice :(

@pacman_pol_pl_polska

Ай бұрын

It is advice but not hand holding.

Your contact mic series of videos are great and inspired me a lot. I have few questions. I am a graduate student studying MEMS piezoeletric microphones. From calculations, I know that its capacitance is only 100~50pF. Do you think I can use your design for my microphone? Or how can I change it to match my microphone? Thx

Sounds like a great idea to me! I enjoyed the video it was quite inspiring but for the end where the technical side of grounding became less inspiring, but seems straight forward. I imagine once news gets out your kit would become quite popular, good luck 😊

@metalmarshmallowllc

Жыл бұрын

Haha thanks, you will be glad that I cut out like 15 minutes of me showing graphs!

@sr3d-microphones

Жыл бұрын

@@metalmarshmallowllc awww! There's nothing better than watching graphs :O)

Hello, is the gain enough high for an acoustic amp ? (With piezo on a guitar). Thanks for the video !

Thanks for your work! So I can use the DIY Kit to connect it directly to headphones? I would love to wander around with a portable thing with headphones to put the contactmic on anything I see and listen to it.

@metalmarshmallowllc

Ай бұрын

You would probably want to run the output of the DIY kit into a headphone amplifier, TI and Analog Devices both have many to choose from. I also have a phantom powered version of this kit that works really well with handheld audio recorders. I use mine with a Zoom H4N so I can monitor the sound live with headphones. (I also sell a complete phantom-powered mic if you don't want a DIY project).

Recommendations for recording significantly attenuated noises around 40 dB (since I hear them far away should I consider -40 dB?) and above? I await info critical to me. Thank you very much.

This question may seems shady but, can i know which IC are you using ?

Hello, nice video. Is it possible to connect more piezo discs to the preamp? In your experience, do more piezodiscs result in better sound quality?

@metalmarshmallowllc

Жыл бұрын

That is an interesting question. I've never tried connecting more than one disc to the same preamp. I'll have to give that a try.

@zsoltyszabo

Жыл бұрын

I m asking because I am considering buying the kit. If I connect, for example, 3 piezzos, can all of them go into the p+ and p- pins? Thank you for your advice.

@metalmarshmallowllc

Жыл бұрын

@@zsoltyszabo I just tried it with 2 piezos and it does work, three should work also. I'm sure you realize that this dosen't give stereo sound, it just mixes the two discs to mono. It could be useful if you wanted to get sound from different parts of an instrument and mix them all together.

@zsoltyszabo

Жыл бұрын

@@metalmarshmallowllc Yes, that's the reason why I want to use more piezos. Thank you for your help.

@metalmarshmallowllc

10 ай бұрын

In case anyone else has the same question, I answered it more thoroughly in a blog post metalmarshmallow.com/blog_post.php?id=11

Hi, as far as I know aluminium reacts with oxygen from the air to form aluminiumoxide, which is an insulator. So, how can it shield the piezo disc when it is isolated from ground? Would copper foil not be better?

@MichaelKrzyzaniak

4 ай бұрын

That is an interesting question and I'm not sure I totally understand the physics of it; You are right that annodized aluminum does not have a conductive surface owing to the thick aluminum oxide. On the other hand I just very gently tested a piece of aluminum foil that has been sitting in open air for over a year and its surface very much is conductive, so evidently whatever oxide is there isn't enough to affect the conductiviry.

@martinbladelvan1949

4 ай бұрын

Thank you, that is a very practical way to answer my question!

Hi, Where could I wire a led to add to the preamp?

@metalmarshmallowllc

3 ай бұрын

To indicate power or to indicate signal level?

Hello! Can I solder four wires instead of two to get two different signals from one sensor? I wouldn't want to use a splitter or a second sensor, I want a small difference in phase and harmonics from one sensor.

@metalmarshmallowllc

5 ай бұрын

You can solder on 4 wires, but I think the signal on the second pair of wires will be identical to the first. This is because both layers of the sensor are conductive, so the voltage should be uniform everywhere on the disc at all times. I'm brainstorming here, but I wonder if it would be possible to cut the ceramic material on the disc in half, then you might get slightly different signals on each half. I'm not sure if this would be different than using two sensors side by side.

@ka_cross

5 ай бұрын

@@metalmarshmallowllc A reason to experiment. Thanks, I'll try)

What is the effect of the disc size? is it frequency cutoff? or the overall volume?

@metalmarshmallowllc

8 ай бұрын

If you suspend the discs by calipers and measure it, you will find that larger discs have lower resonant frequencies. Larger discs also have a wierder frequency responses with many peaks, while smaller discs have flatter responses; or at least the wierdness of small discs is high in the frequency range where it dosen't matter. If you stick the disc to something massive like a wall, the peaks mostly flatten out. There isn't really any difference in sensitivity between large and small discs. I need to make a video about this.

@roq_itrecordingstudio4152

7 ай бұрын

Hello, I would be interested to know if this system would be a good fit to capture the “click” part of the sound of a kick drum. I have hung a senheiser on the front beater head just for this job. Would be cool to have this disc attached to the head and be able to capture mainly high freq area.

@metalmarshmallowllc

7 ай бұрын

@@roq_itrecordingstudio4152 I think it should work but I dont't have a kick drum here to test it with. The only issue is that sometimes the sound distorts for really loud sounds. For example if you put the mic on a cymbal and hit it as hard as you can with a hickory drumstick, the sound will distort. I think the bass drum should be fine. I would put the disc on the very edge of the drum head, you can get very crisp highs there, I show it with djembe in my most recent video with the phantom powered version of this board.