Page about the tapered hybrid boards
Documentation coming - in the meantime ask me if you have questions
email me at parenthetical at this domain
This schematic requires some explanation - coming soon.
Transformer is intended to be a Vigortronix VTX-101-002 2:1 ratio. Or the OEP equivalent which is identical. (In my build I actually used a VTX-101-003 wired as 3.2:1 ratio, just because I didn't have a spare of the 2:1)
This board is designed for tapered mic bodies such as those sold as a "mini U87"
There are 3 or maybe 4 distinct different circuits that can be built using this board, with or without a transformer, if you don't mind departing from the outlines on the silkscreen
A matching polarisation generator board is also available