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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...


• OPIC.43 •


OPIC.43 is a new version of the original OPIC impedance converter and voltage multiplier.
It is functionally identical to the original, but has a number of revisions to make it easier to construct and calibrate...
• Simpler (and smaller) stripboard layouts for both the impedance converter and voltage multiplier boards.
• Fully adjustable voltage multiplier output, using a single rotary variable resistor.
• Smaller stripboards allow for easier construction and routing of the sleeved XLR power connections.
These connections are now made directly to the track side of each stripboard, for neatness and reliability... (See the photo on the header page of the project PDF)

• Just click on the image below for a PDF of the OPIC.43 project details •


• 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 •


HOME
FETLESS ELECTRET
LDC CAPSULE
MID/SIDE MIC
MULTI PATTERN