[Elecraft] K3: reverse 12 volt supply

[Richard Fjeld]

I would think you could wire a relay with a diode in the path to the 
coil so that it would not operate
if the polarity of the power leads are reversed.  That way, there would 
be negligible voltage drop when operated.

Dick,n0ce


On 9/13/2015 10:09 PM, Don Wilhelm wrote:
> The base K3 is protected by an in-line diode that will not allow 
> reverse voltage to flow.
> The same is not true of the KPA3 where the reduction in voltage would 
> not be tolerable.
> The KPA3 is protected by a circuit breaker, but in this case did not 
> trip in time to prevent damage.
>
> 73,
> Don W3FPR
>
> On 9/13/2015 10:55 PM, James F. Boehner MD via Elecraft wrote:
>> Whew!
>>
>> Not a good feeling-but it can happen to any of us, regardless of how 
>> careful
>> we are.
>>
>> Elecraft has been very good on suggesting helpful modifications to the
>> radio.  Any thoughts? Perhaps an in-line diode?
>>
>> I'm not sure if that would result in a significant voltage drop-just a
>> thought.
>>
>>
>
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