[AF-1] Rev A - J2 AF Out Looks Different?

[MaverickNH]

I'm building the Elecraft AF-1 Audio Filter. My PCB has "REV A" printed lower left. I see pictures of a "REV XA" on the web, but mine definitely say "REV A" only. The "REV B" manual http://www.elecraft.com/manual/E740102%20AF1%20Active%20Audio%20Filter%20Rev%20B.pdf shows that modifications are needed at both J1 AF IN and J2 AF OUT jacks, I did the J1 - AF In mod, but see that my PCB is different than that shown in the REV B manual.

The manual show this http://i29.photobucket.com/albums/c290/cbjesseeNH/AF-1-2_zpsfzrvndif.jpg

My PCB board looks like this http://i29.photobucket.com/albums/c290/cbjesseeNH/AF-1-1_zpsxstny3c8.jpg

The reason for the mods are given as:

The PC Board traces for the AF1’s audio input jack J1 and output jack J2 were wired to only the “ring” connection of the stereo tip-ring-sleeve jacks.  If you are using stereo mini-phone cables this will not cause a problem, but a mono plug will not provide any audio into the AF1 as the J1 “tip” is unconnected.

Additionally, the AF1 J2 Output jack should have the tip and ring connections wired together so that stereo headphones work correctly.

Saturday and Elecraft is closed, so I thought I'd ask advice here, thanks.

BRET/KC1CJN

[MaverickNH]

Hi Ron,

Now that I look, I guess the PCB change has the same circuit once I solder the jumper. Thanks for the keen eyes!

73, BRET/KC1CJN

----- Original Message -----

From: "Ron D'Eau Claire" <[hidden email]>
To: "MaverickNH" <[hidden email]>, [hidden email]
Sent: Saturday, June 11, 2016 12:50:29 PM
Subject: RE: [Elecraft] AF-1 Rev A - J2 AF Out Looks Different?

HI Bret:

I don't see the difference other than your image being rotated 90 degrees.

It's common for the boards to get revised and the manual is not updated if the changes don't require a change to the assembly instructions.

73, Ron AC7AC

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of MaverickNH
Sent: Saturday, June 11, 2016 8:49 AM
To: [hidden email]
Subject: [Elecraft] AF-1 Rev A - J2 AF Out Looks Different?

I'm building the Elecraft AF-1 Audio Filter. My PCB has "REV A" printed lower left. I see pictures of a "REV XA" on the web, but mine definitely say "REV A" only. The "REV B" manual http://www.elecraft.com/manual/E740102%20AF1%20Active%20Audio%20Filter%20Rev%20B.pdf 
shows that modifications are needed at both J1 AF IN and J@ AF OUT jacks, I did the J1 - AF In mod, but see that my PCB is different than that shown in the REV B manual.

The manual show this
http://i29.photobucket.com/albums/c290/cbjesseeNH/AF-1-2_zpsfzrvndif.jpg 

My PCB board looks like this
http://i29.photobucket.com/albums/c290/cbjesseeNH/AF-1-1_zpsxstny3c8.jpg 

The reason for the mods are given as:

The PC Board traces for the AF1’s audio input jack J1 and output jack J2 were wired to only the “ring” connection of the stereo tip-ring-sleeve jacks. If you are using stereo mini-phone cables this will not cause a problem, but a mono plug will not provide any audio into the AF1 as the J1 “tip” is unconnected.

Additionally, the AF1 J2 Output jack should have the tip and ring connections wired together so that stereo headphones work correctly.

Saturday and Elecraft is closed, so I thought I'd ask advice here, thanks.

BRET/KC1CJN



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[MaverickNH]

Confirmed! I finished the build and it works just fine.

Quite a nice filter - adds a lot to the KX-1 (or takes a lot away of the noise, I should say).

BRET/KC1CJN