Thank you!

Thanks!

All the best... go for it!

Thanks... and are you talking about any specific noisy part or the entire video?

Thanks!

Not in a simple of convenient way that I can think of (you'll have to kill the chrome process and tab switcher). Raspberry Pi docs will have more options for setting up wifi... see if any of those matches your expectations.

@@BreakerSpace Thanks! which browser does it use?

It uses the default chromium browser.

@@BreakerSpace I have installed it and the piosk is running in the browser asking for URLs but on reboot there is no Kiosk Mode. It boots back on the GUI. I am using Raspberry pi Zero W 2. Can you sugest what I doing wrong?

Also followed this: - go into sudo raspi-config - select advanced options - then select wayland - then select wayfire window manager with wayland backend - Reboot

That's right, I found out about this particular JFET (K596) having integrated resistor after I had already soldered it in. I was checking its datasheet for its ratings, just to ensure it'll be OK for the larger electret capsule (higher capacitance). I was interpreting the effect of lower resistance due to the parallel resistor as lower attenuation for the high-frequencies (i.e. wider bandwidth); but overall result will be similar (flatter response curve). I had thought about desoldering and rebuilding it, but haven't gotten to it yet as it never seemed like an issue (I prefer flatter response curve; and theoretically I can EQ it in software if I really need to, though in practice I don't need to). Thanks for your comment, you clearly know the inner workings of microphones; which is very refreshing and hard to come by!

That's right!

The point of the video wasn't trying to make the best microphone on earth. It was to show how easily one can DIY their own microphone and inspire them to use it for their daily purposes (and get at least the same/similar results, or hopefully even better with little more effort & dedication). Most people aren't audio engineers or vocal artists; so introducing complexities for marginal improvements is moot for them, and it only push interested people away from trying (for the fear of failing).

@@BreakerSpace Couldn't agree more to this.

Thank you! And yeah... soon™

Not your fault friend; I heard the same lie... this is a very old ghost of the past since vacuum tube days. Will take time to get out of people's mind.

@BreakerSpace so how do you know if one needs 48v or not?

​@@XscudX no condenser microphone capsule with modern JFET/buffer needs that kinda biasing voltage. Mic level signal is ~10 millivolt peak to peak, and even the pre-amp'd line level signal is 1Vpp. You can even use a coin-cell to bias electret mics (and most low-cost self-biased mics do). In fact, the 48V isn't even used. Take a look at any modern mic schematic. It's brought down to 2-10V (with a zener diodes), and rest of it is discarded (unused).

@@BreakerSpace Tube mics have dedicated PSUs. P48 standard is mostly used for solid state mics. Also, this voltage ensure a correct backplate polarisation (if needed, not needed in an electret) and sufficient headroom. It's not a myth, it's a solution to problems. It's not a ghost of the past, it's still widely used in pro audio.

It is used. Look at a Schoeps mic output and how it works before making blind claims.

Thank you so much. I've added your solution as another alternative to the pinned post. We'll update PiOSK soon as well so it'll again work out of the box.

@BreakerSpace just to put it out there, I'm running the pi 4 4gb. Would you also be able to add a feature that allows it to be disabled rather than Uninstalled? It would be nice to disable piosk to make changes directly in the gui. A workaround i have is to just alt+f4 to close the browser. I wasn't able to exit full-screen to minimize it to make any changes. It's not too big of a deal, but it would be super convenient. Thank you for the video and the work you've done to make this project. It's perfect for my use case

Pop filter makes a huge difference; Faraday cage no difference at all (especially if the mic out to JFET gate connector is very small, so it doesn't work as RF antenna). Would make a part 2 some day with the signal connected to an oscilloscope for A/B test. Till then, take my word for it.

"Hello darkroom my old friend...."

@@BreakerSpace :D Can you tell me what value the Resistor has? 10k?

@@klofisch 1M, but as explained in the video better to go even larger (and not necessary if the JFET already has it integrated, which it does, that I later found out).

Thanks & all the best!

Yup!

Haha... The production/presentation was questionable, but we did have a ton of fun making the video (like always)! Thanks for coming along on the journey 🙏

BreakerSpace is all about the art and science of jugaad!

Thank you... will do sir 🫡😊

Thank you! 🙏

That's right! 😎

Thank you! :D

One of those times, when you totally expect the experiment to fail... but left with a pleasant surprise that you didn't!

With some genuine effort, enough of time and a lot of power of will, anyone can do anything. All the best.

This is a part one of a series of videos I have planned; and I will come to polarizing voltage for true condenser mics, the utility of phantom power to that end, its better alternatives & the tech-debt of carrying analog signal over long distance etc. But as a sneak peak... I prefer to digitize my analog signal as close to the source as possible, and carry the digital signal to destination cause order or magnitude more effective that way (as you've mentioned, USB audio adapters... use that for signal and you can source power from it as well). So, unless you have an entire ecosystem of equipment already built around phantom powered XLR cables, in general, I'd not recommend picking them up for a modern setup. I'd rather recommend retiring them gradually.

@@BreakerSpace Ok, maybe that makes sense, especially in studio environments and similar setups, but perhaps not so much for live stages and events. Either way, I understand your point. Regarding my question, I was mainly trying to understand what voltage you used to polarize the capsule. I want to test 26mm and 34mm capsules, but I haven’t been able to get them to work due to the voltage. I’m never sure if I really need the full 48V or if a specific and lower voltage would be enough. I’ve subscribed to your channel for updates

​@@Bunny-gv1fe An ECM is internally polarized at the time of manufacturing (by use of the charged electret plate). A TCM (True Condenser Mic) needs external polarization. The polarization voltage is analogous to the "tug of the string" in a stringed instrument. You want it to be taut, without braking apart. Every 2x polarizing voltage will give you +20dB of SNR. There isn't an upper limit for what the voltage should be - it depends on the material property of the diaphragm, and the separation between the plates (how far can it be stretched in, without touching the other surface). Around 60-80V is most commonly used for most TCM capsules (they commonly use some form of voltage boosting to get there). You can go higher at your own risk. But you can just as well use half that voltage (i.e. well under 48V) for a quality that's virtually indistinguishable by human ears. Even ~5-10V can work, but at that point the quality difference may become perceivable. Keep an eye out for my upcoming video on TCM. I can't promise to go very deep (as most people skip over if the content goes too deep), but I will touch on these points. Thanks for being curious!

@@BreakerSpace Thank you very much for the clarifications. I'll continue being curious here, testing new capsules and so on. I'll keep an eye on your updates.

We are aware of something fishy happening, but none of the reports conclusively point to any certain reproduction step. If you can please file a issue, or add your thoughts to the existing ones on the same line, it will be very helpful: github.com/debloper/piosk/issues/32 github.com/debloper/piosk/issues/41 There are also some forced differences in configuration across boards even in the official image (e.g. github.com/debloper/piosk/issues/29 ) which makes putting finger on the root cause very hard.

As I mentioned this in the last part: smaller the mic, higher the chance of it recording unwanted noise (because, smaller diaphragm = higher sensitivity). Larger the mic, closer the sound sources that are captured in it... eliminating noises at a distance.

@@BreakerSpace which Sensor or diaphragm should I buy?

@@bhushan9066 you can buy the same one I've used in this video. It'll already give you more than 20dB of noise separation, compared to lav mics.

@@BreakerSpace thanks 🙏

That's correct... this mic will need a biasing voltage to work (which thankfully is handled by most consumer devices where headphone-mic combos work). The biasing voltage & signal out circuit stays with the sound-card section of the computer/laptop; which is basically a load resistor from the bias source and a coupling capacitor towards the signal. If you want to avoid relying on the host for biasing, or want line-level output, then you'll have to add a preamplifier to this mic's output. I prefer MAX446x/MAX9812/MAX9814 etc as preamp in such a case.

Thank you! The case came with the Waveshare 7" DSI display (you can get the displays with or without the case); and the heatsink-fan combo is something I had lying around (forgot when & where I bought it from), but you can search with "raspberry pi dual fan" to find them on amazon or aliexpress etc.

Asking the right question!

Mic circuit are mostly here for pre amplifying, equalizing, impedance matching and balancing the outputs (look up symmetric signals). All of those are called 'Signal Conditioning' in electronic engineering. Why are we doing this? Well, in the pro sound world, you don't want your mic to work in some circumstances, you want it to work ALWAYS, even with 100m of cable between it and the preamp. The mics hacked together in this video will just disintegrate as soon as you sneeze on them, and sound awful anyway.

@@MrPureBasic digitize the analog signal at source, carry it over a protocol that doesn't disintegrate if you sneeze on it. All these complexities of audio ecosystems (from circuits to cables) are self-imposed masochism. USB adapters exist.

​@@BreakerSpace How do you plug 36 mics in USB? Yes, you gather them in analog and then make a mass conversion. Here are some downsides of USB for pro audio use: - You need signal amps on a USB cable if you want more than 10m of cable run. USB connectors fail when you sneeze on them. - Most cheap integrated Mic preamp USB direct converters sound reaaally bad. - If you don't use an electret, you will still need more voltage for the backplate than the 5V offered by the USB port, meaning you need at least a boost converter (noisy, complex...). - You cannot sync the clocks of different USB interfaces converters, meaning you will have to pass through multiple ASRCs. - If you have 36 mics, who is the master clock? How do you feed the converter clocks to the other mics? - How do you deal with latency in a live, monitoring critical situation? - Etc... etc. Meanwhile, a well balanced mic or impedance balanced output will carry signals over more than 100m of microphone cable without noise or loss, instantly. Conversion at the mic for pro studio and live use was done by Neumann with their now discontinued numeric line. But again, that's a clock distributed system, with premium preamps embedded in the mic and premium A/D conversion, and all of this is passing through dedicated interface and is outed on AES lines. They sound fantastic. Nevertheless, we still got back to good old analog mics. It's cheaper yet offers about the same quality while being more sturdy to deploy on stage. Also, we could get that much AES lines to interface well with digital desks. It was becoming very complicated to get the sound of a large number of those mics without passing through some bridging, meaning more potential failure points. If you only want one mic for streaming contents, you don't need any of that, for sure. A single USB mic will work. But that fact doesn't make your microphone anymore high end and doesn't mean that no one need real high end mics. Anyone can plug shit in a laptop mic in and get some sound. Don't be a fool. We don't do all of what we do for nothing.

@@MrPureBasic I meant to do it eventually, but if you can fund the project now, I can show how it can be done in next 6 months. I'll need no more than $1M to forklift that entire industry & my GitHub has sponsorship options link. It's pretty easy to write why humans can't ever fly over Atlantic, why AI can't play chess, why rockets can't be reusable, until someone shows how it's done. If you've tried to do this and failed 50 times, then I have massive respect for you, and I'm interested about the iteration details from those trial runs. Otherwise not.

Will do... thanks for watching!

I used Tip=Left, Sleeve=Mic pinout (i.e. CTIA or Apple pinout). This is good for mono channel biased inputs like phones and headphone+mic combo jacks. If your system has stereo biased pinout for Mic input, then you need to connect the connectors Left and Right channels to the mic's output, ground to ground, and leave sleeve floating (or just use TRS). Hope it made sense to you; give it a try & let me know if it worked. Some of these issues are highly situational & hard to predict without seeing it IRL.

Thank you very much for your kind words... it really means a lot! 🙏

Yes, you can! Make sure the large diaphragm mic you're planning to use is pre-polarized kind (i.e. electret one, as the one in this video).

Thanks, glad you liked it! 🙏

😄

Yes, I am going to show how to use old phones as cheap cameras (should work on both android & iOS devices).

On my bucket-list... that's all I can say for now! 😉

Thank you... will do!

Would be good community discussion point for implementation pathway, to validate which mechanism is preferred by the most users (SSH? Dashboard Button? Uninstall/disable? etc) For the time being, I personally just kill the browser & switcher process through SSH if I need to (which is not often). But I understand, it may not be the most convenient option for most.

If you can put the images/videos inside a folder, you can install a simple HTTP server (Python or Node.js based) to run it as an HTTP static file server. Links would be like: localhost:8080/image.png & rest of it is no different.