Electronics > Beginners
My negative voltage rail doesn't work
mheruian:
Hi everybody,
for some reason, i learn how op-amps work (e.g. non-inverting and inverting configuration), i even test them on a online simulator and it works. Its just that it doesn't work when i applied it :( why is that? If ever, please teach a beginner like me. I am no genius so a detailed layman's term answers would be so great :)
my setup:
my simulation:
mheruian:
I even tried using two (2) separate +12v supply that were grounded to each other.
each +12v supply has one (1) +5v voltage regulator.
first +5v voltage regulator acts as a supply only on the op-amp.
second +5v voltage regulator acts as an input on the op-amp.
still, same results. The +5v input on inverting op-amp doesn't output -5v output. Why is that??
oPossum:
You are expecting an opamp to output -5V when you have only supplied it with +5?
mheruian:
Oh?? i see. thanks. so there is no way to create a negative supply using op amp?? :-\
Muxr:
Yes you can create a bipolar power supply with an Op Amp. Basically you can use an Op Amp as a rail splitter in order to create a virtual ground.
The ground in the schematic is a virtual ground. This is the ground the circuit using this bipolar supply should reference. The old GND from the battery becomes -6V and the 12V rail becomes +6V.
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