[Elecraft] External speakers for K3 - A caution

[wayne burdick]

On May 11, 2009, at 12:10 PM, Joe Planisky wrote:

> Wasn't the mod described at 
> http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_C.pdf intended to 
> prevent the IC failure if a mono plug was used?

The bleeder resistor modification helps prevent an instantaneous 
current surge when an mono plug is inserted, and is definitely 
recommended. It has already been phased into production.

The new firmware provides protection in the case where high 
right-channel speaker volume, in conjunction with the insertion of a 
mono plug, results in extended high current drain at the AF amp chip.

73,
Wayne
N6KR

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