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What does "rails" mean?

For example:

"5V at the rails"

"rail to rail amplifiers"

"As for current delivery, most will do a few milli-amps, but
typically not near the rails"

"an opamp with a symmetric output swing at each rail"

"as long as your supply rails were properly adjusted."

"This pretty much slams the square right up to the rails"

Thanks,

JP

What does "rails" mean?

For example:

"5V at the rails"

"rail to rail amplifiers"

Unless I'm mistaken (I'm still learning here), the rails are the maximum and minimum voltages the amplifier can go to. Whether it's single ended or double ended (one transistor, or two doing push pull), and what the supply DC voltage is will determine this. Of course, by the time you get to the 'rails' you've really distorted your signal...but that's good, to me. Many amplifiers are more efficient and distort the least with lower outputs. I like to turn things up to eleven though. But not for guitars. Look at what your DC supply voltage is, and that's probably the peak to peak output voltage of the amplifier, though it can be less than that depending on the circuit. In fact, it probably will be.

But I may have no idea what I'm talking about.

-Tavys

I didn't see an answer to this. But, mail has been slow through my
server today. so forgive me if this is a repeat. "Rails" is a term
that refers to the power supply voltage, often times on a bipolar
power supply. So, if you have a typical power supply designed for op
amps and such, it might supply +15 VDC and -15 VDC. Some might
include +5 VDC is there are logic circuits. These power supply
points are often called the "rails."
Larry Hendry

--- jpotter2@... wrote:

What does "rails" mean?

For example:

"5V at the rails"

"rail to rail amplifiers"

"As for current delivery, most will do a few milli-amps, but
typically not near the rails"

"an opamp with a symmetric output swing at each rail"

"as long as your supply rails were properly adjusted."

"This pretty much slams the square right up to the rails"

Thanks,

JP

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