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Hmm I'm no expert on SimpleP48. AFAICT they don't work right with transformer input mic preamps, which I mostly use, so i haven't investigated. Plenty of others here would know better what you can do

I agree with thet- don’t overthink it. There’s so much mixing and reflections and resonances that you can get away with quite a lot. The accordion pros that I know usually have two mics, top and

Thanks thet -- It's a piano accordion, so the reeds are linearly arranged. Doing some tests (with a single Primo omni Simplest P48 inside the right-hand side) I do hear a strong difference for the

if you have two mics inside the front of an accordion consider: * each reed is a different distance from each mic, and so the intermic delay for each reed will be different resulting in a different

Ah, so maybe I should stick with 2 capsules per side? I wonder how the six-capsule pro solutions deal with it, then... maybe they don't worry about it...

Yes, sorry, I think from the perspective of a keyboard player :-) -- I meant height. Yeah my original thought was to use two mics arranged as I believe you are suggesting: bass / treble, basically. If

It just doesn't work, because the mics are not in free field. They are in a confined space, where the act as pressure sensors. Distance does not result in significant attenuation._._,_._,_

Ah, right, forgot about the 3-to-1 rule/guideline, thanks! I think I might be OK, then... in a multi-mic setup the mics would be pretty close to the instrument so I should be able to beat 3-to-1. -c

Really? I thought the width of an accordion was significanty variable as you squeeze it. Do you mean height? I've installed mics in all sorts of accordions; I always put one set on the left and one on

I'd comment on the comb filtering only. The conditions for the comb filter to appear are 1) identical signal, and 2) time delay (i. e. sound path difference). The more equal the signals are, the more

I'm scheming on making internal mics for my accordion using Simplest P48. Using just a single internal mic would greatly emphasize some notes over others, so a typical design uses multiple mics

I use those as well and some SMD versions. Best Regards, Jules Ryckebusch

I use these ones, if its any help: https://www.mouser.co.uk/ProductDetail/TE-Connectivity-Holsworthy/RGP0207CHK1G0?qs=ip69W3eHERWnWvdTrALHzw%3D%3D

Interesting. Could a diode be used instead of the 1GOhm resistor? Resistors that size seem challenging to source after some quick searching.

Yea it is ( the 1Gig) needed. The capsule has a capacitance of 15-55pF so that forms an RC filter that takes care of the noise. It also provides DC bias to the FET (or What ever the Impedance

Thanks Jules! Found the schematic. Is a 1G Ohm resistor really needed? Why such a high value? Wouldn't this add noise to the circuit?

Yes, the “Alice” or Pimped Alice. They both have a FET front end. You need that for the impedance. There aren’t any PNP or NPN only ones Best Regards, Jules Ryckebusch

Just wanted to ping the group to see if there's a recommended transistor style preamp design for the TSB2555.

Hello, I finally got this beast working, in meanwhile I've ordered alice pcbs (previously I made it on protoboard lol), hq components, IC's from myfriends (I call chinese sellers myfriends, because

I've been designing some new mic PCBs with opamps and thinking about what I haven't tried yet. So I'm thinking - opamp mic circuits are very clean, reasonably quiet, and generally pretty good. Kind of