Yeah, a real circuit. I had the LM358 sitting there anyway, just changed the resistors.

I don't offhand see how the op-amp can go negative (below ground) but I'm no expert on them.
Yeah, a real circuit. I had the LM358 sitting there anyway, just changed the resistors.

I don't offhand see how the op-amp can go negative (below ground) but I'm no expert on them.