Teensy Audioboard works only with headphones

D

dirky

Member
Hi,
i built my first Teensy project which is T1 Synthesizer from Notes and Volts. It works perfect with my headphones which have a 3 Ring Trrs jack. If i plug a stereo jack in and want to connect it with my Interface nothing works...also my oscilloscop isnt showing anything. As far as i know it should work with any 3,5 Jack. Do you guys have any suggestion? I set the SGT5000 to 1.
Thanks for reply
 
@dirky: The headphone jack on the Teensy Audio Shield is for use with headphones only. Not sure exact.y what you mean by "and want to connect it with my Interface", but you should not use the headphone jack to connect with any other kind of external equipment. You should instead make connections between the LINE OUT pads/pins on the Teensy Audio Shield and your external equipment.

In my TeensyMIDIPolySynth (TMPS) project (where I use both the headphone jack & the LINE OUT connections), here's what I have to initialize the audio:

Code: 
   sgtl5000_1.enable();
   sgtl5000_1.muteLineout();
   sgtl5000_1.dacVolume(1.0f);
   sgtl5000_1.unmuteLineout();
   sgtl5000_1.adcHighPassFilterDisable();

Hope that helps . . .

Mark J Culross
KD5RXT
 
Last edited:
Thank you. Ok, i thought i just put a 3,5 jack cable into the teensy audio shield and connect it with my pc´s audio interface.
So i just solder a new jack to the line out pins and add the code to the sketch?
 
@dirky: Yes, that should do it. And, if you want to control the volume, I use sgtl5000_1.volume(headphone_volume_value);to vary the headphone volume, & I use sgtl5000_1.lineOutLevel(line_volume_value) to vary the LINE OUT volume.

Good luck & have fun !!

Mark J Culross
KD5RXT

P.S. The audio out from the Teensy Audio Shield & the microphone input on your PC will not be impedance matched. Look around for the circuitry to make a good impedance match between the two if you need to connect them. To get audio into your PC, you might look at the Teensy capability to appear as a USB audio device to the PC (select "Audio" or "Serial + MIDI + Audio" as the "USB Type" in the Arduino IDE to use this mode). MJC
 
I followed a Youtube tutorial... What is Dave actualy using because he connects the Audoishield via the Headphones output... Its some sort of Adapter :
 
It appears to be some kind of a USB audio adapter. Even better . . . you can use the Teensy (in USB Audio mode) directly for this !!

Mark J Culross
KD5RXT
 
USB Type is set to Midi. I wonder what sort of Audio adapter because a USB Audio Adapter is actualy what my USB Interface is.
 
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