I'd need to know exactly what the 25mm capsule is. A link or picture would be good there.
Do you understand the difference between an electret and an externally polarised capsule?
Your 34mm capsule (probably) requires an external polarisation voltage if it is a K87 style. The 25mm may or may not. (I need more details)
There's no real definition of a "true" condenser, but some use it to mean externally polarised. that's separate from fet-less.
Do you have both the boards in that listing? Looks like one is to generate the polarisation voltage and one is the headamp. The 34mm would need both.
Correct wiring will be different for the two capsules if the 25mm is an electret.
Did you use both OPA alice boards or just one? That project has two boards, again a headamp and a polarisation generator.
toggle quoted message
Show quoted text
On 24/06/2022 18:07, Richards wrote:
Good Day, Thet -
I apologize for any imprecise descriptors in my question. While I am experienced concerning microphone applications - I am just learning the microphone modification game.
This is the board in question:
I have used other boards with good results, for example the popular JLI OPA Alice board an others sold on eBay. I am curious why this one has produce different, and inconsistent results with the same capsules used with the other boards.
I appreciate your the distinction between phantom voltage and polarization voltage - although I confess I need to learn more about both. I am sure you are headed in the right direction concerning 60v polarization.
I am confident both capsules are FET-LESS "true" condenser types. The 25mm capsule appears to be the same capsule discussed today in another thread. The vendor described the 34 mm capsule as an RK87 type. I can provide images or links to eBay if that would help.
Thank you for the prompt reply! Please advise if additional information is required to move forward. JHR
