I want to generate a signal in my computer that has a DC offset and output them to the real world.
Unfortunately, the DC offset does not pass through my soundcard.
So I found this "solution" online.
What the article does not state is that the large chip on the circuit board gets very hot trying to pump out DC instead of the bipolar signal it was desgned to produce.
The author suggests a 100R in paralle with the output cap. So I then tried upping this to 10K which provided less but still acceptable shift, but still caused heating.
I then tried a 1000Uf cap in parallel, which again caused heating.
However, these are cheap and handy ltittle devices.
My question is, apart from clamping a large heatsink on the overheating chip, and accepting as little DC shift as possible, is there any way I could safely use this particular USB soundcard to output a DC offset signal?
BTW my application requires me to use the computer to produce the signal, not a function generator, etc.
Ken Morrow