Search found 3 matches

by tjk
Mon Apr 08, 2019 10:36 pm
Forum: Ultra Sound card for the Pi
Topic: Differential AUDIO Inout circuit
Replies: 1
Views: 591

Re: Differential AUDIO Inout circuit

This card is advertised as being able to digitize "DC", but the differential inputs clearly are AC coupled and have a 3dB lower cutoff frequency at 20 Hz. This is certainly not "DC". The input for the codec (removing the amplifier card and connecting directly into the R or L inputs) is better, but i...
by tjk
Mon Mar 18, 2019 7:36 am
Forum: Ultra Sound card for the Pi
Topic: Differential AUDIO Inout circuit
Replies: 1
Views: 591

Differential AUDIO Inout circuit

I understand that this device can work down to DC. Do you have a description of the input circuit, or a portion of a schematic showing the input circuits for the device?
by tjk
Sat Jun 10, 2017 3:15 am
Forum: Stereo soundcard for the Raspberry Pi
Topic: The effect of HPF changes
Replies: 1
Views: 1355

The effect of HPF changes

I am using the Cirrus Logic/Audio card for a sub-sonic audio project and was disappointed that the card was abandoned. I received two of the AudioInjector Stereo Cards and have tested them as potential replacements. They use a different Wolfson chip than the Cirrus Logic card. The chip used is still...