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Inspired by tree ears concept and having it tested in few setups I decided to make a permanent fixture. I found myself a roughly head-sized log, bought silicon ears from Ali as well as a connector box with XLR sockets and a front plate. I set the ears in the log (router is handy for this and even hand-held gives nice, clean results), drilled the log through, filed a flat square at the back and drilled a ca. 20 mm hole in the base to set it up on a tripod. Electronics as simple as it gets: AOMs 5024 and Simple P48. Capsules are set in 3 cm long tubes recessed into the head, not mounted directly in the ears. It's heavy, though not as heavy as KU 100 (3,5 kg!). It looks funny. I like funny. But it works quite nicely. I think. I embraced unevenness of the log - human heads are not even, regular, symmetric nor perfectly shaped either.

Bamboo, like elephant grass(miscanthus), has a very high silica content, 10x higher than barley straw and 5x – 10x higher than rice straw on a dry matter basis. This blunts tools very quickly.

I am having trouble getting these self-adhesive felt pads for microphone capsules (10mm ones, like Primo EM272 etc). I have tried Amazon, Aliexpress etc. - but cannot find anything like this. The purpose of the pad would be to protect the capsule from dust etc getting in, as much as possible. It would be very handy if there were some self-adhesive pads of this diameter that I could just stick on the capsule. But all I could find in this diameter were the ones for use on unglazed pot bases to protect furniture and worktops - these are too thick (to be used to cover holes in the microphone capsule), I am afraid? The felt pads for furniture (chairs for example) are even thicker. Any advice on where to get them or what to use instead?

Few days ago I completed the build of my first two AOM 5024 mics. The build is simple, well documented (Tom's blog and Jules' instructable. BTW thanks to them I joined this great community). I trusted Jules and ommited shielding of the capsule. No hums, interferences - nice & quiet. But the enclosures... Could've made them myself but wanted a more elegant solution. It took me a while but eventually I've found dirt cheap enclosures on aliexpress. The dimensions given in the description are ridiculous, no mention of the inner diameter but creative comparative eyeballing convinced me to take the huge risk of ordering a couple for 50-60 cents apiece. Total with postage to Poland - ca $3,50. Here's the link: https://m.aliexpress.com/item/1005001494595179.html?spm=a2g0n.order_detail.order_detail_item.3.451bf19cgXOEYo There's a choice of terminals: TRS or TRRS. Irrelevant - the cable is single shielded file, unsuitalke for our purposes - you will get rid of it anyway. Cable OD - 2 mm. I had a 4 mm one so I had to get rid of the rubber strain relief and get creative with shrink tubing. The front cover screws into the body and is relatively easy to unscrew with fingers. If it fights back - use a piece of rubber or a latex glove for better grip. There's a steel mesh just pushed in the cover. Prone to falling out. Lousy job, but for 50 cents, good enough. Inner diameter of the enclosure is 10 mm so AOMs, with their required insulation, fit nicely. The cover's ID is 8,5 mm so our capsule would be pushed inside and the distance from front of enclosure to the face of the capsule would be ca 3,5 mm. Fearing sound colouration I mounted mine flush with the edge. The clips are quite well made. The spring is strong. They can be removed (again springy holder). Before soldering everything together it's good to make sure that the clips are put on the enclosures in opposite directions (for left and right microphone mounting on whatever you'll put them on). And the photos:

I am a newbie in terms of mic building and modding, I have studied electronics in university, but have done only digital design for about 15 years now. I am trying to design (for fun) a different preamp to fit into a t.bone EM700. I like the response of the capsule, but would like a bit more level out of the mic (about 10 dB more than the original preamp offers). I have considered just plugging a FetHed Phantom in between, but based on some images I found online and based on the schematic of the regular FetHead (which I have confirmed by tracing one I have), I believe that it will forward the equivalent of ~15V phantom to the mic, which is not what it is designed for. So here I am, dusting off some old skills and learning new ones. The capsule is FET-less, the original preamp has a FET and a 1G resistor in the input stage. I like the Schoeps input stage, pictured below, including the ability to adjust Vgs (I have done some simulations with different FET models, and having a pot there is very useful). The effect of the adjustment is that the DC value of the gate voltage is now set by the split of the 1M pot, which may set Vg at let's say around 1 volt. This effectively attempts to polarize a pre-polarized electret capsule by 1 volt or so. Will this impact the response of the capsule? Of course I could mitigate this by adding a series capacitor (probably a 1 nF polypropylene cap between the capsule and the gate/ 1G resistor), but do I really have to? I am grateful for your replies. While I know my way around transistors and electronics in general, how a pre-polarized (electret) capsule will behave under these conditions is a mystery to me.

So here's a weird one. I'm pretty much aging out of live sound mixing, because my ears have gotten too sensitive. Loud actually hurts, and more importantly loud causes distortion and I'm not hearing accurately when that happens. So what I'd like to find is a way to reduce the volume but still hear reasonably accurately. I do have custom-molded Sensaphonics earplugs, and it's not good enough. Weird things happen to the very high frequencies. I fooled around a little with mounting one of the filters to my Earthworks M23 test mic, and while I didn't get any useful frequency response readings (can't properly measure the full "system"), I did notice that the phase trace got rather delayed at higher frequencies. So what I'm experimenting with right now is some kind of stereo mic array to go with my in-ears (Sensaphonics). A basic ORTF with either Alice or CAD E100 seems sort of OK, but I'm wondering about something like a Crown SASS type thing, or maybe a dummy head. Possibly just a sphere? Anything I could try out locally (northern Chicago burbs)? Mono compatibility is not a concern, just trying to match to reality but be able to turn reality down. The ideal is something that packs relatively small and just plugs into whatever mixer I'd be using. The good news is that the bulk of my paycheck does *not* come from live mixing these days. But I hate turning down gigs that would be fun to work. Thanks, -Scott -- ---- Scott Helmke ---- scott@... ---- (734) 604-9340 ---- "I have ceased distinguishing between the religious and the secular, for everything is holy" - Joe Henry

I want to share this microphone that I just bought as a donor body for my DIY. It is pretty similar to Telefunken mics. I found this on Shopee and there are mics like this on Aliexpress. It is called F22 condenser microphone. When I bought it, it comes with a 25mm capsule and these identical circuit board, which is funny that they included 2 of them: one is the functional one with components and the other has few components missing. These boards are attached with two wires. On the picture, I have replaced the capsule with the one that I am using.

Good Day Microphone Fans. I have a pair of very low cost little circuit boards for condenser capsules. I purchased them in the spirit of DIY experimentation, notwithstanding I cannot find any information about them. Can anyone tell me anything helpful about either of the boards shown in the attached images? I prefer not to guess what sort of capsule matches each of them, respectively. I do not mind experimenting, but loathe the prospect of roaching them or any capsules by letting the all-important essential smoke out by inappropriate pairing. Thanks loads. James

Have some questions about building a AOM-5024L-HD-R mono mic to connect to a USB sound card to capture low frequency sounds. This is some info from the web: 1) A reviewer of a Ugreen USB sound card says: The microphone input is designed for a 3.5mm stereo mini phone plug. If you use a microphone with a mono plug, such as a Denon receiver calibration microphone, be sure to plug the microphone in only partially – if you plug it all the way in, it will NOT work. It should also be noted that the UGreen USB audio adapter will output stereo but the microphone input is mono only. 2) The mic input power for several USB sound cards can range from 2.43-4.59V and the nominal spec for the AOM is 3V. 3) The recommended soldering duration for each terminal should be 2 seconds and a metal fixture can be used to hold and act as a heatsink. What are your thoughts on using lead-free solder and is extra rosin necessary? Which sites do you recommend for parts like 3.5mm plug and bare wire? Can you buy the AOM capsule with cables already soldered, or on a PCB? Can you recommend a budget soldering iron/station, quality seems to be an issue when reading reviews? I remember soldering a small chip to a Playstation with a no-name iron, but the solder was probably lead based.