On May 11, 2022, at 09:58, tedsorvino via groups.io <tedsorvino@...> wrote:

?All good. As I said before no issue with the voltage (constant 64v occasionally -50mv). Mainly housing issue. I mean very tight space for all components and interconnections. I reflowed some solder around the 1gohm and the Opa legs and all good. I put things back while I was auditioning? it loudly through headphones (I know it can be dangerous for a lot of reasons - but I 've done it before with other builds). The issue was mainly the interconnection cable of bias that was touching somewhere, and something around the xlr base (I guess all the trial - error with heat on the cheapo components of BM 800 mic body don't help a lot). Covered the exposed things, put things back carefully while listening. No external noise. Really really quiet built. Good signal to noise ratio for my liking. A bit darker sounding mic, compared to my usual ADK Vienna and also compared to the OPA based electret build.
I think it will be an ongoing project, since I have some more boards and there is another capsule side that asks to be used (and a personal ambition for a 3 mode DIY mic). But I guess I will allow myself some time with the cardioid part just to familiarize myself with the characteristics and the potential issues that may arise on these 2 newly built mics.
Thanks Jules for the excellent design and Jerry Lee for the advice and help while things were not clear.