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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

Hi Thet, could you email me? I would be interested in a pcb and can't send you an email.

I have PCBs that I design here in the UK, I can get a PCB to europe cheaply, and one of my designs is an opamp mic board. My PCBs are all designed for through-hole components so easy soldering. I

Thank you Mark! Yes what I was looking for 100% That explains why the mic looks brand new. The person probably opened it and broke the switches and then just sold it on ebay. BTW I am loving the baby

The switches in the Blue SL mics are NKK Toggle Switches G12AH Mouser Electronics Part # 633-G12AH

I emailed you directly. If you have ideas, I’m all ears. Best Regards, Jules Ryckebusch

Hi All For people like me who live in Europe, ordering the amazing https://www.jlielectronics.com/diy-accessories/opa-alice-single-channel/ is really expensive for the shipping cost + customs fees