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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.

I bought, at Aliexpress, such an ultrasonic transducer: https://www.aliexpress.com/item/1005002546378216.html?spm=a2g0n.order_detail.order_detail_item.3.77f7f19cNIRHnf Soldered it to a piece of cable - single shielded wire (see pictures) with 6,3 mm plug I had laying around and it is quiet. In 2 wire cable with shielding mount and an XLR plug there is a faint buzz, eliminated totally when shielding is connected to the outer case (obviously). No buzz, no hum, just silence. I ran few tests - it seems to have good sensitivity. Easy to handle, to press against a surface. Looks very promising. Haven't tested it as a hydrophone yet, for the lack of handy stream near by.

Hi There folks! I've been experiencing some RF interference on some PUI AOM 5035L mics into a WM8960 CODEC. Any advice on how to mitigate this would be much appreciated! Sorry for the long message, but here it goes... I like these mics for my application (loud drums) because of their really high AOP (135dB) and big SNR (75dB). For the most part, I've been pretty happy with my project. In my basement, and around my house, I experience superb sound quality with no RF interference. But at my favorite drum rehearsal spot (drumbox in Lafayette), I am experiencing RF noise. I will attach a recording I made of the sound, if your curious or might be able to help identify the kind and/or source. I've tried many things, including the following: 1) Turning off all bluetooth and I2S communications on my microcontroller. It is simply controlling the PGA gains on the mic inputs and passing that through the CODEC in the analog bypass paths. This is less likely to be the culprit, because in my basement I don't experience the RF interference (even with BT/I2S running). 2) Upgrading all audio and data cables to shieled (Mogami W2697). 3) Wrapping a GND wire around the small connection from CODEC to MIC (which includes it's required pull-down resistor and in-series cap mini-PCB). 4) Putting my entire "right ear" electronics inside a box that I covered with copper tape (two layers). FWW, this stops any RF noise introduced by when I hold my RC airplane transmitter nearby. But doesn't stop the drumbox RF noise. Which I'm guessing is a stronger RF signal (?). 5) Putting a separate CODEC in the left ear, in hopes that the shorter distance of the left mic and left CODEC would help. But still no luck. I later found out that the RF noise can also enter my right ear signal - depending on the rotational position of my head (while wearing the headphones). None of my efforts have seems to stop or reduce the RF interference into my system at the drumbox. The owner has let me know that they wirelessly beam their Wifi from the main building out to the rehearsal room (across the parking lot). So my guess is that this might be the cause. Any thoughts would be greatly appreciated and thanks in advance! Cheers, Pete PS there is much more info on my tutorial, but these two diagrams show the bulk of the project: And here are my attempts at protecting with copper tapped box and wrapped GND wires:

Hello everyone, I'm a beginner. I've made a pair of microphones using the Primo EM273 for my Sony A6600 camera. Recently, I bought a Zoom H6 recorder, so I need an adapter to connect the microphones. I've searched many options (such as the BOYA 35C-XLR Pro, RODE VXLR+, R?DE VXLR Pro, etc.), but they are too expensive. After searching for a long time, I found this one, priced at only $7.5. It's made in Guangdong. The seller said it has a balanced output.I opened it up and took some photos, but I don't really understand circuits. Although it looks a bit strange in shape.Could you please help me determine if it's worth it? Thank you.

Hi to everyone, I'm trying to build a Zapnspark's generic Fet preamp, as small as possible, hence SMD components, used with various 3-wire Primo capsules like EM200,EM273,EM182. I want to use them mostly at live concerts, so output impedance, maxSPL-headroom, EMI/RF immunity and low noise are important factors for me. The point of this build is to fit the PCB inside the XLR plug.The whole board i designed is 24.2mm x 12mm. Ideally i'd like to fit also a 3pin mini-XLR on the other end(it will need some modification on the XLR's boot). I have a few questions about this design. 1) Can you spot any error on the PCB or the selected components? 2) Would 22nf ceramic caps between pins 1-2 and 1-3 add additional EMI/RF immunity, with no drawbacks? 3) Could i replaced the 2 BC860Cs with a dual PNP like SSM2220 or relevant, in order to avoid hfe matching and reducing size? Should i expect the same performance? 4) Primo capsules seems to give the least noise and highest maxSPL figures, when biased at roughly 9v. Is it just R2 and R5 which will change the Bias voltage? Any suggestion are welcome. I'll post my Fusion-Eagle project for inspection and reference, Eagle Library, and my Mouser basket. Mouser basket: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=e3dd5d0951 I think it would be a great simple project for this community, if implemented right. Thanks in advance, Raptakis Konstantinos