Thanks, Johan, for sending the capsules. They arrived today, well packed and looking good. I have looked at them both and they look excellent for finish and evenness of the diaphragms. I have not removed them from the plastic cases, but I presume that the holes for mounting are underneath the green tape I see around the outside of the capsule.
I am thinking about maybe using a circuit designed by zapnspark and is in his folder in the Files section of the micbuilders site. I have used it with some LDC electrets, and it is an excellent performer. Now I have to find out how to polarize the capsules with a suitable polarizing supply to make use of the twin diaphragms for different mic polar response patterns. That seems to e the challenge at present. Maybe others in the group may have some good ideas. I look forward to any helpful advice.
By the way, any info on what size screws are suitable for use in mounting the capsule?
Kindest regards,
zephyrmic