Hi, I have a DSP demo board which is powered from an AC/DC adaptor (5V). I also have another instrument which is supplied by a separate AC/DC adaptor (15 V) and it is used to provide a signal to the DSP. I was wondering if I could tie the two grounds from the two separate adaptors together? Thanks.
Welcome to Bit, omid300 The lead between the two may be doing it for you, if it works don't mess. You'll certainly need at least 2 wires between them, signal and ground, but adding extra ground links may be counter-productive.
Thanks for the Welcome! The prblem is that it doesn't work, the 5 V signal provided by the instrument is not 5V compared to the DSP ground. That's why I wanted to connect the grounds together.
assuming that these are just plug in "wall wart" power supplies and share a common ac source, you should be able to wire the returns together so they reference the same point.
I took a risk and connected the grounds together and nothing bad happened, so I guess my problem is resolved! thanks for your help. Omid
