I started this project back in march but stopped due to various time demands. I was finishing my PhD and doing all sorts of other things.

I remember testing the headphones with the pre-amp on my pc using a cheap usb sound card. I remember it worked but the cheap braided cable didn't solder nicely and I took it apart in preparation for packaging everything inside a box.

Velleman Kit Instructions

I remember soldering the kit together and making sure it worked but seemingly forgot that it was a pre-amp for the microphone(it's dynamic).

I'm going to get some better wire and reassemble everything for another test prior to de-soldering the sockets from the USB hub i've bought.

In the interim i'll use a 12v bench supply to power the pre-amp but for the final device I'm looking at using a boost converter to go form the 5v usb rail to the 12v required by the pre-amp.

Probably something like this cheap Chinese boost converter

Cheap as chips not as nourishing?

Hopefully i'll be able to nip into a lab somewhere in the university and do an assessment of the noise from the boost converter.