It’s not a matter of trimming away VDC. His circuit is there to be able to add a VDC to the signal, to be able to shift it up or down as desired. The soundcard won’t give you anything that is ...

Signal generators are a useful piece of kit ... the MHS-5200A is a low cost, two channel, 25 MHz generator that can be found on eBay. The downside is the software. It’s an ugly Windows ...

The 1510A Precision Signal Source generator available from MTI Instruments is a compact and portable device and includes dual-channel Direct Digital Synthesis (DDS) that creates high precision signals ...