OPIC

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FETLESS ELECTRET
LDC CAPSULE
MID/SIDE MIC
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With this kind of project, there will always be further ideas and revisions that don't fit precisely into any of the existing pages. Listed here are some further suggestions, not covered in the other project notes...


• An LDC mic with no Voltage Multiplier •


It is possible to use an LDC capsule in a simpler configuration, without fitting a separate voltage multiplier for capsule polarisation. The sensitivity will be slightly reduced - about 3dB less than the same capsule biased with 60v.
The OPIC42 circuit shown below uses one side of the 48v phantom power to supply c.30v to the op-amp circuitry, and the other - unloaded - leg to supply c.42v as the polarisation voltage.
A simpler construction that can work pretty well - especially with higher sensitivity capsules.

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


• An Adjustable Voltage Multiplier •


The Voltage Multiplier schematic and stripboard details attached to the LDC and Multi-Pattern versions works well. The adjustable version shown below is derived from that first concept.
It is a slightly simpler configuration that uses fewer components, and lends itself better to a stripboard layout.
There is now extra room available for an adjustable variable resistor to be mounted onto the stripboard.
This will permit the DC output voltage level to be controlled more precisely.... Very useful for those experimental projects!

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


HOME
FETLESS ELECTRET
LDC CAPSULE
MID/SIDE MIC
MULTI PATTERN