cathode follower

vlljpior · 22nd March 2005, 04:42 PM

hi, i want to know if the cathode follower is a gain stage.

If i have a 4 gain stage preamp + a cathode follower, do i have 5 gain stage ?

SY · 22nd March 2005, 04:44 PM

There's no voltage gain, but there is sometimes power gain.

Sch3mat1c · 22nd March 2005, 05:44 PM

Yep. Whether or not you want to count it as a "stage" is up to you... or more importantly, how you connect it. Say you take NFB off the output; an extra coupling capacitor (to the CF) will give you trouble, however a cathode follower can be direct coupled easily, making an essentially invisible (electrically) buffer.

But that's an answer much too specific for such a vague question. I'd rather say something nonsensical like "battle of new orleans" in response.

Tim

vlljpior · 22nd March 2005, 05:58 PM

SO, THIS SCHEMATIC HAVE HOW MANY GAIN STAGE 3 OR 4 ?

ThorstenL · 22nd March 2005, 06:24 PM

Konnichiwa,

Quote:

Originally posted by vlljpior
SO, THIS SCHEMATIC HAVE HOW MANY GAIN STAGE 3 OR 4 ?

Neither, gain stages in total 5 plus one cathode follower, which is not strictly a gainstage in the of voltage gain, but a stage with power gain, so really the answer is 6!

Sayonara

SY · 22nd March 2005, 07:17 PM

I've deleted the schematic since it appears to be the copyrighted drawing of someone else. If you have permission from the owner to post this, let me know and I'll put it back up.

vlljpior · 22nd March 2005, 07:50 PM

Sorry, i didn't realize that. I used this schematic because is the one that i found with the spec i need to be explain.

Sorry...

22nd March 2005, 04:42 PM	#1
vlljpior diyAudio Member Join Date: Jul 2004 Location: laval	cathode follower hi, i want to know if the cathode follower is a gain stage. If i have a 4 gain stage preamp + a cathode follower, do i have 5 gain stage ?

22nd March 2005, 04:44 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	There's no voltage gain, but there is sometimes power gain. __________________ If there's a sucker born every minute, where do the rest of them come from?

22nd March 2005, 05:44 PM	#3
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Yep. Whether or not you want to count it as a "stage" is up to you... or more importantly, how you connect it. Say you take NFB off the output; an extra coupling capacitor (to the CF) will give you trouble, however a cathode follower can be direct coupled easily, making an essentially invisible (electrically) buffer. But that's an answer much too specific for such a vague question. I'd rather say something nonsensical like "battle of new orleans" in response. Tim __________________ Seven Transistor Labs Projects and Resources

22nd March 2005, 07:17 PM	#6
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	I've deleted the schematic since it appears to be the copyrighted drawing of someone else. If you have permission from the owner to post this, let me know and I'll put it back up. __________________ If there's a sucker born every minute, where do the rest of them come from?

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22nd March 2005, 05:58 PM	#4
vlljpior diyAudio Member Join Date: Jul 2004 Location: laval	SO, THIS SCHEMATIC HAVE HOW MANY GAIN STAGE 3 OR 4 ?

22nd March 2005, 07:50 PM	#7
vlljpior diyAudio Member Join Date: Jul 2004 Location: laval	Sorry, i didn't realize that. I used this schematic because is the one that i found with the spec i need to be explain. Sorry...

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