[Elecraft] AF1 - couple of questions

[David Wilburn]

Thanks.  I have two ext. speakers that work fine.  They are mono 
jacks.  Headphones (stereo jacks) work fine, but the ext. speakers do 
not, even though they do when connected to a radio.


Dave Wilburn
K4DGW
K2/100 - S/N 5982


WA6OCP wrote:
> Dave,
> 
> I have had no problems using 12V while leaving the 9V battery installed.
> 
> Although I don't use mine to drive an external speaker directly, I just
> tried it using the 9V battery, and an old computer speaker, and it worked
> fine.  The errata changes were made so that the left and right channels
> would be commoned.  I have had some 1/8" plugs and jacks that have had some
> inherent problems.  You might want to check for continuity and/or shorts.
> 
> Neal WA6OCP
> 
> 
> David Wilburn wrote:
>>
>> ......  Questions;
>>
>> 1. - I am currently running the AF1 with a 9v battery, but I will be 
>> connecting it to 12v supply here in the shack.  I was going to leave 
>> the 9v battery installed, as it appears the diodes that are part of 
>> the circuit will protect it.  But wanted to confirm.  
>>
>> 2 - I performed the circuit changes documented in the errata, and the 
>> AF1 works fine with headphones (stereo jacks), but it does not seem to 
>> work with any of my external speakers.  Did I loose that option when I 
>> made the changes in the errata?  They seemed to be required for it to 
>> work with headphones.
>>
>> Dave Wilburn
>> K4DGW
>> K2/100 - S/N 5982
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>