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.
Headamp for BM700/800
This board has a schoeps style circuit on a board designed to fit cheap donor mics the BM700 and BM800.
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.
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
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.
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
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.
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.