# Swamping resistors, a bit off subject

Started by November 15, 2006
What's a swamping resistor?!?
> What's a swamping resistor?!?

In what context? In general, a swamping resistor is a current limiter
in AC and RF circuits used to reduce impedance variations that limit
bandwidth.

The 100-ohm resistor in series with an impedance that varies between
2ohms and 20ohms, for example, will appear to be an impedance that
varies between 102ohms and 120ohms, much flatter, at the cost of
efficiency due to power lost to heat in the resistor. One might say
that the impedance variation of the circuit has been swamped, or
overwhelmed, by the dominating resistance.
Tom
I meant in an amplifing circuit context what is a swamping resistor? Swamping?! As in a swamp?!
Cheers

David Mendes

----- Original Message -----
From: Tom Becker
To: b...
Sent: Wednesday, November 15, 2006 4:25 PM
Subject: Re: [BasicX] Swamping resistors, a bit off subject
> What's a swamping resistor?!?

In what context? In general, a swamping resistor is a current limiter
in AC and RF circuits used to reduce impedance variations that limit
bandwidth.

The 100-ohm resistor in series with an impedance that varies between
2ohms and 20ohms, for example, will appear to be an impedance that
varies between 102ohms and 120ohms, much flatter, at the cost of
efficiency due to power lost to heat in the resistor. One might say
that the impedance variation of the circuit has been swamped, or
overwhelmed, by the dominating resistance.

Tom
> ... As in a swamp?

If you are asking about the English slang derivation of the verb To
Swamp, I have no idea. Here in Florida, there actually is an
acitivity called swamping, and it is just what you'd expect -
exploration in a swamp, usually on wet feet.

Electronically, try using the word "dominating" instead of swamping
and see if that helps the context.
Tom