Search found 6 matches

by hystrix
Wed Feb 06, 2019 4:25 am
Forum: Ultra Sound card for the Pi
Topic: Muting circuit of the Audio Injector sound card
Replies: 1
Views: 1096

Re: Muting circuit of the Audio Injector sound card

I know this is a very old post, but I would also like to know how the muting circuit works, as it would be very useful.

Many thanks.
by hystrix
Wed Feb 06, 2019 4:23 am
Forum: Ultra Sound card for the Pi
Topic: Connecting an external microphone
Replies: 0
Views: 257

Connecting an external microphone

It's not immediately clear how to connect an external microphone to the Ultra Sound Card. I posted this question over on the GitHub Forum site, but there's not much support there, unfortunately. I would like to connect an electret mic to the base card, like this one: [https://micbooster.com/primo-mi...
by hystrix
Sun Nov 04, 2018 10:31 pm
Forum: Ultra Sound card for the Pi
Topic: Ultra Sound Card setup
Replies: 2
Views: 1092

Re: Ultra Sound Card setup

I'm going to answer my own question :-) It was just a case of setting ADC Mux to "Mic" (a value of zero). Setting it to "1" changes it to "Line In". "PGA Volume" sets the volume (min value = 0 or -12dB and max value = 48 or 12dB). A simple bash script with the following will set the mic up for recor...
by hystrix
Sun Nov 04, 2018 2:28 am
Forum: Ultra Sound card for the Pi
Topic: Ultra Sound Card setup
Replies: 2
Views: 1092

Ultra Sound Card setup

I have tried for hours to get this card working, but cannot record anything (assuming that I should be able to record using the on-board mics). I have installed the latest version of Raspbian, and I am using a Pi Zero W. Here's the output from $ arecord -l **** List of CAPTURE Hardware Devices **** ...
by hystrix
Sun Feb 25, 2018 3:56 am
Forum: Discussion and pointers
Topic: Audio Injector Ultrasound
Replies: 3
Views: 2580

Audio Injector Ultrasound

Does anyone know whether the Audio Injector Ultrasound card for the Raspberry Pi Kickstarter https://www.kickstarter.com/projects/12 ... n=89ac6d37 will ever go live?

Looks like I fried my Cirrus Logic Audio Card and I need to be able to record at 192kHz.
by hystrix
Tue Aug 01, 2017 4:30 am
Forum: Stereo soundcard for the Raspberry Pi
Topic: Audio injector zero kickstarter is live !
Replies: 22
Views: 7039

Re: Audio injector zero kickstarter is live !

I'm new to it all really, but I found this detector and thought I'd try making it. It should probably more be called a recorder. It's likely to do various things, but the main one seams to be recording ultrasound (UK bats tend to be low 20kHz up to just over 100kHz but in the area I live they're ge...