Electronics folk: would the negative part of a 12v DC power supply barrel jack be -12v?
Trying to search engine this is not simple what with the LLM bullshit x)
@renbymon Depends. Are you using the positive side as the 0V reference point? If so, then yes. The negative terminal would be -12V.
But if you use the negative terminal as the 0V reference point then it is 0V and the positive terminal is +12V.
It's always relative to a reference voltage, and typically the "negative" terminal is the reference voltage.
@dragonarchitect @Jencen I'm trying to reverse engineer a eurorack mixer to recreate on a breadboard. It uses power to run an op amp, and it used both of its +12v and -12v rails to power it. I guess the follow up question is that does VCC- need to go to negative whatever voltage I input or can it just go to ground?
Data sheet for the op amp in question: TL072 page 5 https://www.ti.com/lit/ds/symlink/tl072.pdf
@dragonarchitect @Jencen Also here's the mixer for context https://www.n8synth.co.uk/diy-eurorack/eurorack-mixer/
