OPEN SOURCE DIY Mic Project - ORS 87 - Stripped Down u87

[Juan Vargas]

Then it's okay.
But do you know that these 2 resistors must be matched, with a precision of < 0.4%?
I bought a lot so I could make matched pairs.

yes I know I should buy more to match them, or getting 0.1% ones

 

[nyystero]

Can someone help me with wiring the Neutrik NTE10/3 on Khron's plus board?
From the thread i understood it needs to be wired in reverse which makes it a bit more confusing to me, and it's a little different from homero's board so i have a hard time finding an image i could use as reference.

 

[Juan Vargas]

on the NTE10/3 the yellow wire and white I got about 43 ohms and the red and black wire I got about 1.7K ohms I see P+and P- the higher resistance goes towards the circuit and the lower resistance to the S1+ and S2- I think it goes like that I see option for center taped transformers on the ORS Plus is not clear to me I want to try Khron's PCB design later, about that connection he can explain better he got more knowledge than me I just star to learn last year I usually build class AB audio amplifier and also PCB designs

 

[Khron]

on the NTE10/3 the yellow wire and white I got about 43 ohms and the red and black wire I got about 1.7K ohms I see P+and P- the higher resistance goes towards the circuit and the lower resistance to the S1+ and S2-

That sums it up pretty well. Worst case you might need to swap the S1+ and S2- wires, in case it ends up reverse-polarity.

I see option for center taped transformers on the ORS Plus is not clear to me I want to try Khron's PCB design later, about that connection he can explain better

The option is there - if one has a transformer with a center-tapped secondary, then R4/5 are not needed.

Sadly i still haven't managed to find the time to write up a buold guide, but i haven't given up on that thought!