[Elecraft] K1 flickering ATTN LED with new KBT-1

Thu Jan 31 22:08:32 2002

That is a very good explanation, and 100% correct.

73,

Gary Surrency AB7MY

On Thu, 31 Jan 2002 19:40:58 EST [email protected] writes:
> In a message dated 1/31/2002 6:06:32 PM Central Standard Time, 
> [email protected] writes:
> 
> 
> When I choose battery voltage
> with the display button, the ATTN LED flickers very faintly. 
> 
> +++++++++++++++++++++++++++++++++++++++++++++
> 
> 
> Hi Al
> 
> Looking at the schematic, the Attn. LED is controlled by the same 
> MPU I/O 
> line that reads the battery. This line is normally programed as an 
> output to 
> control the LED. When the read battery function is selected, the 
> line is 
> changed to an input just long enough for the a to d converter to 
> read the 
> battery voltage. During this short time the battery voltage turns on 
> the LED 
> through U5B causing a flash. At least that's the way it looks to me. 
> Wayne 
> Eric or Gary may want to comment if that's not quite right
> 
> 
> Don Brown
> KD5NDB
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