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You are undoubtedly talking about positive regulators.dknguyen said:Linear regulators can't sink current right? If you need it to sink current you have to use an op-amp reference? I remember reading something about this a long time ago but it's so long ago I can't remember if I'm just making it up.
If you add a load resistor on the output of a 78xxx regulator you can "sink" some current through the resistor. This is only really practical for small currents as the max "sink" current is equal to Vout/R.dknguyen said:Linear regulators can't sink current right? If you need it to sink current you have to use an op-amp reference?
on1aag said:Some expensive exotic regulators can do both, even at the same time.
That will work if you are building a discrete regulator, but adding it to an integrated regulator is problematic.Hero999 said:Shunt regulators can both sink and source current.
Building a linear regulator that can sink current is easy, just use a complimentary push-pull emitter follower on the output rather than the usual single transistor.
Linear regulators can't sink current right? If you need it to sink current you have to use an op-amp reference? I remember reading something about this a long time ago but it's so long ago I can't remember if I'm just making it up.
The only reason I noticed is that I opened the thread at the beginning. I saw some of my posts, and didn't remember making them, so I checked the dates.Hello again,
Yeah geeze! Got me again ha ha
Yeah that other user replied and that was to an old thread, so that's why it came up in my browser.
What do we have to do, check the first post in a thread just to make sure it isnt a super old thread? Geeze
It would be nice to see a 'warning' of some type indicating that the first post of the thread was older than say 90 days.
MrAl, I've mentioned that exact same solution at least twice in the last few years.
I didn't get anywhere =)