Compact plug and play USB interface for headset, headphones, or microphone; stereo DAC and mono ADC. Supports CCTIA and OMTP jacks.
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Features: Based on PCM2912A Plug and play USB-interface 2-channel DAC and headphone amplifier 1-channel ADC and microphone bias TRRS (4-pole) jack for headset More information including schematics …
Read More…Features:
More information including schematics and full measurement data at nihtila.com
Jumper link/pinheader for:
CTIA and OMTP are two different pinouts for 4-pole 3.5mm jacks.
What's included
Enclosure (not included)
The board was designed to fit in a small(est) Hammond enclosure. However, note that 4-pole jack is metal and sleeve is connected to this metal shield - and sleeve is microphone in CTIA jack instead of ground. Therefore, if this metal touches the enclosure (like in photo below) with CTIA selected, it shorts the microphone input. Due to this I recommend choosing a Hammond model with plastic end panels.
Recommended enclosure, with plastic end panels:
If you want metal end panels and isolate it from the jack with heat shrink or similar, the model number is 1455D601.
PCB is thinner than normally and it has strips of exposed copper at the connector end which should contact with enclosure; you can add some solder to make the contact better. PCB is secured in the enclosure with screw connector.
Background information
I bought myself a Rode SmartLav+ lavalier microphone for recording voice for videos. I can use it directly with my camera but sometimes want to plug it in computer to record voice. The mic has a CTIA-type TRRS plug as it is really meant to be used with iPhone. With TRRS to TRS adapter it can be used with standard microphone connectors, for example found in cameras. While it can be plugged directly into a PC mic port, those can be quite bad quality and in desktop computers in very cumbersome places on the rear panel.
After realising almost all USB audio interfaces are both overkill and may not even really support plugging such small condenser microphone (because they have instrument or balanced phantom mic inputs), I did a quick Googling if easy-to-use ICs were available. And yes, Texas Instruments PCM2912A was something I was looking for.
Specifications
ADC (microphone input)
0 dB external gain
20 dB external gain
DAC (headphone output), high-impedance load
Full measurement results at nihtila.com
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