Low frequency output on the Behringer UCA202

To drive the bassbox directly from a computer, we modified a Behringer UCA202 USB audio interface.
The bassbox requires very low frequencies (down to 0.2 Hertz). Unfortunately, low frequency signals are rejected by DC-filtering capacitors in most audio-interfaces.

We simply replaced a bunch of 10 microfarad capacitors in the Behringer UCA202 by 1000 microfarad types and put the whole in a larger metal case (using female Neutrik jacks instead of the original cinch connectors).

Using a dual channel oscilloscope and some test-signals (generated with PureData, SuperCollider and CSound), we observed a much better low frequency response.

Pieter Suurmond and Hans van Eck, september 13, 2008.