Half Shaved Yaks

PCBs (for DIY Microphones)

Here are some boards I designed that you can buy for your projects. Boards are £5 each plus £1.50 P&P for uk postage.

email parenthetical at this domain to get more info and arrange payment

Documentation and photos are in progress, but will take some time to finish as there's a lot to do

All the pcbs here so far are for mics, but I do have some more on my would-like-to-do list including a basic transformer mic preamp, and a THAT chip mic preamp.

Schoeps pcb for BM700/800

Headamp for BM700/800

This board has a schoeps style circuit on a board designed to fit cheap donor mics the BM700 and BM800.

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bias pcb for BM700/800

Polarisation voltage generator for BM700/800

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.

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pcb for tapered mini U87 bodies

Hybrid board for tapered mic bodies

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

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opamp mic headamp

Dual opamp headamp for BM700/BM800

This board has two entirely separate opamp driven circuits on a board designed for cheap donor mics the BM700 and BM800.

This is my single opamp-per-channel redesign of DJJules' dual opamp pcb here: True-Condenser-OPA-Mics

Designed for use with a 5 pin XLR to give dual outputs for dual diaphragm capsules. But can be easily used as a single headamp by only populating one side of the board.

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pcb for tapered mini U87 bodies

Board for classic transformer fet circuit

This board is designed for long cylindrical mic bodies

It is designed to make a classic Neumann-style circuit with a single fet and a OEP or Vigortronix 6.45:1 transformer

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AKG C460 board

Board for AKG C460/480

This board has a Schoeps style circuit, and a bias generator, on a board designed to fit an AKG C460 or 480 body.

I made these because i had a pair of C460s that werent working right any more.

They don't sound the same as the original. But they do sound good. Not necessarily better or worse, just different.

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Schoeps circuit for for AKG C414 bias generator for AKG C414

Pair of boards for AKG C414B-ULS

Should also fit TLS and other C414s from that era. I would not expect it to fit the current model XLS.

2 boards: a Schoeps circuit, and a polarisation voltage generator

I made these because i had a C414 that wasn't working right any more.

My build of these sounds slightly livelier than the original, which is rather restrained and almost dark, but this has a little less heft in the lows.

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