OPIC

LDC capsule version

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• Just click on the image below for a PDF of the project details •

Alternatively, you may prefer to build a mic using a PCB rather than stripboard...
Hobby microphone builder Mic Scharf has developed a PCB for this version of the project,
which you can obtain from: HERE

The schematic above shows the audio circuitry required to interface a conventional (non-electret) large diameter condenser microphone capsule - 'LDC' - to a microphone pre-amp fitted wih 48v phantom power.
The circuitry includes an impedance converter - utilising an OPA1641 op-amp - and appropriate output coupling capacitors and resistors.
This very simple interface uses the single op-amp as a unity gain non inverting buffer amplifier, powered by 48v phantom power from the mic pre-amp.
The circuit has a low quiescent current requirement - around 1.8mA - has very low distortion, and is only marginally noisier than equivalent impedance converters which use discrete FET inputs.
The stripboard layouts are designed to fit into that common 'donor body' - the BM800/NW700 - but also work well in Neumann 'style' clone bodies - from WGTCenter, for example... (Click on the image in the header at the top of the page to see more details).

In this 'LDC' configuration, a separate stripboard is also required to generate the external capsule DC polarisation voltage. The schematic for that circuit is shown below.

• Just click on the image below for a PDF of the project details •

As suggested, just click on either image to download a PDF which contains the schematics, circuit descriptions, and stripboard layouts for all the circuitry required.

Alternatively, you may prefer to build a VM using a PCB rather than stripboard...
Hobby microphone builder Mic Scharf has developed a PCB for this version of the project,
which you can obtain from: HERE


• Some further project options:
An LDC mic without a voltage multipler.... plus an alternative adjustable voltage multiplier
can be found on the 'More Options' page: HERE


HOME
FETLESS ELECTRET
MID/SIDE MIC
MULTI PATTERN
MORE OPTIONS