Half Shaved Yaks

Under construction

Page about the BM700 boards - polarisation voltage generator

Documentation coming - in the meantime ask me if you have questions

email me at parenthetical at this domain

bias board for BM800 mic

bias board for BM800 mic

polarisation voltage generator

This board has a dual polarisation voltage generator on a board designed for cheap donor mics the BM700 and BM800.

Designed to generate +/-60v although the voltage can be varied somewhat.

Dip switches allow pattern selection for dual diaphragm capsules.

Output voltage can be set by varying the value of Z1. A 9.1V zener gives about +/-60v

The photos show an earlier version of the board - without S10 or R13. In the pics S10 has been added afterwards. Current boards have S10 properly mounted on the board.

More details coming