Audio board for microphone mods, such as building a high quality condenser mic or for use with electret capsules.
The PCB is designed to allow numerous circuit variations - see the assembly notes in the link below for various schematics and assembly examples.
For use with true condenser mic capsule, a bias supply is likely needed - see the Power PCB (PCB_MM_POWER) as a suitable example.
Also when using a condenser capsule, the board can be fitted with PTFE insulated terminal pins to minimise leakage and stray capacitance from the critical capsule and JFET gate connections.
These are available separately, see item MM_PTFE_PINS.
These are bare printed circuit boards only, to suit the assembly a microphone audio PCB.
No other components are included.
The pictures of assembled PCBs and the converted microphone are purely to illustrate possible uses of these circuit boards.
Note that the assembled microphone was built with prototype PCBs which have slightly different component overlay printing to the final versions. The individual built boards are assembled on the same PCBs as listed.
This audio board can be used for many variations of microphone circuits, for use with either condenser or electret capsules. A bias supply board or some other bias supply voltage is required for condenser type capsules,
Full details of suitable components, schematic diagrams and further information is in the project page here - see the Parts list and schematic links:
Microphone mod boards
The PCB mounting holes are spaced to suit the common low cost BM800 - NW700 - NW800 etc. cheap electret microphones usually listed as "studio condenser" types for around £15 or less.
They can of course be used with other casings or in DIY assemblies, but some form of mounting adaption may be needed.
The end result are totally dependant on the types and quality of the components used to assemble the boards; I include suggestions and/or part numbers in the parts list to aid identification and purchasing of the components.
Postage or shipping will be added at checkout.