DIY or Upgrade Microphone PCBs – Condenser or Electret

This listing is for either: Both the audio and power PCBs together, Both PCBs plus a pair of PTFE insulators for the high impedance terminal points and two 1G resistors, as these can apparently be difficult to obtain, A single microphone audio PCB (“Microphone interface” PCB), Or, a single bias power supply PCB for use with condenser capsules, These are bare printed circuit boards only, to suit the assembly a microphone audio PCB and/or a bias power PCB. No other components are included beyond those explicitly mentioned in the purchase options; 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. The 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 on my web site here – see the Parts list and schematic links: http://robert-jenkins.co.uk/site/index.php/electronics-and-audio/designs-projects/23-microphone-modification-upgrade-circuit-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 is included in the item costs for the UK, with significant discounts for multiple items in one purchase. I will also supply to Europe, the USA, Australia, New Zealand and many other parts of the world, however this adds considerably to the postage costs – the minimum international cost for just one set of PCBs is almost £8.00 Some additional shipping charges will be added at checkout to allow for the increased Royal Mail fees. No refunds unless damaged in transit or the wrong item sent etc. All items are sent via tracked and/or signed-for services. PCBs are copyright (C) Robert Jenkins. The listing is for one bare PCB or pair of bare PCBs and optionally PTFE insulated pins. No components, no other microphone parts or capsules etc. are included.