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You have a right to toot that horn a bit. https://audioimprov.com/AudioImprov/Mics/Entries/2015/4/23_Basic_FET_Microphone_Circuits.html was the post that got me started with this whole crazy obsession

Not to toot my own horn, but schematics of many mics I've tinkered with are on audioimprov.com. Not well organized, but there is a list of topics. 3-pattern electret made with 2 cardioid electret

Ah! That all makes a lot of sense. I love that I learned a lot today. I realized that the TSB-2555 has a fixed static charge on the diaphragm and takes the signal from the backplate, similar to what

On March 11, 2025 at 6:50:11 PM, matthewsewell via groups.io (matthew@...) wrote: If you do this with a dual diaphragm with a single backplate, does that mean you can only do

Thanks, Henry. This makes perfect sense. I figured that the second resistor was related to the signal coming from the backplate but you've explained why. I am interested in your comment about a

Here's why some have two 1G resistors, some have one. It comes down to capsule mounting and designer choices. The capsule needs to have a polarizing voltage between diaphragm and backplate. Call it

Great question. The bias voltage is applied to the backplate. Then the diaphragm is connected to the virtual ground via the 1G resistor. That resistor “develops” the signal via the voltage change

Beginner here. I've been looking over the instructable for the True Condenser OPA and there are 2 things that I'm not completely understanding yet. I suspect they are related though. In other mics

@pmfalcman, thanks so much, that's really helpful. I'll take a proper look at the photos.

Headbaskets are intentionally moved to the front (not centered width wise) to minimise sound reflections from the top of the body. It would be advisable to 3D print own capsule mounts from

I made rough drafts (xlr connectors and "headbaskets" are to scale), top and side view, to facilitate imaging. Still the PCB dimentions are

I'd love to. Unfortunately I don't have it yet. Not even in loose parts. I said this before - it's an idea at the moment and at first I plan to make two separate mics in these small enclosures from

@pmfalcman thanks again. Hope it's not asking too much, would you be happy sharing photos of the full rig? It would be very helpful. Damian

Goran, Thanks, but I have the stock MH-31 mic that came with the radio. I am just not impressed with the voice quality it produces. Since ham radio is very much about experimentation, this is another

James, Many thanks! You have address virtually all of my concerns. :) I bought the SM58 because it was recommended in order to improve sound quality. The MH-31 mic that came with the radio is ok, but

I'm not sure mine's better solution but I want a self contained unit. A "brick", well... sort of. A sturdy piece of gear. And it's easier to fashion up some extra wind protection if need be. Couple

@pmfalcman - thanks so much, the photos area really useful. I might have to rethink my original idea. I'm not even sure how large the PCBs are. There's nothing to lose really, the mics were heavily

I sorted the issues with acces to the linked photos. I hope... Just in case, properly shared

As I like ORTF a lot I was cunningly planning to make myself a handy, self-contained unit, mostly for the reasons you stated above. I came upon Magnusson's and DIY Perks' solutions long time ago but

@Kennjava good suggestions thanks. @Heinz, thank you. His approach is interesting.? Didn't realise the photos had detailed captions. I think overall I'll be fine if I take my time. The mics were