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Re: [Amps] 180 Phase SHifter Off Topic

To: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] 180 Phase SHifter Off Topic
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 30 Oct 2008 12:27:51 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
On Tue, 7 Oct 2008 22:02:48 EDT, CAA357@aol.com wrote:

>building or schematics of a wide  band 
>180 degree phase shifter

Do you mean a POLARITY inverter or PHASE shifter?  They are VERY 
different. PHASE is a function of frequency, while polarity is 
not. Polarity is nothing more than turning the waveform upside 
down at ALL frequencies. Some good ways to invert the polarity 
are 1) a conventional gain stage (not a "follower"); 2) a 
transformer. A polarity inverter 

Virtually all networks or transmission lines are extremely 
frequency sensitive. Polarity inverters are frequency-sensitive 
only to the extent that the gain stage or transformer is non-
ideal (that is, that it has stray L or C or both). 

73,

Jim Brown K9YC



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