[Elecraft] Re: Getting more KX1 sidetone levels by using tristate

[wayne burdick]

Hi Leigh,

Thanks for the suggestion, which I've added to the wish-list.

73,
Wayne
N6KR

On Nov 30, 2004, at 1:47 PM, Leigh L Klotz, Jr. wrote:

> The KX1 offers 4 sidetone levels, 3 if you discount "off", generated 
> from two pins of the PIC16 microcontroller, which are toggled high and 
> low through two resistors to the audio amplifier, forming a primitive 
> resistor/amplifier DAC.
>
> Additionally, the KX1 (unlike the K2) mutes the RX during STL and STP 
> menu operations, making CW beating harder.
>
> A recent article in Electronics World magazine (11/2004, p.47) 
> discloses a technique to obtain ternary values from the MPU's I/O 
> pins.  The technique uses the three 0/1/HiZ states to provide 3 output 
> voltage levels per pin, instead of just two....
>
>

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