[ARC5] ARC-5 Pot Taper

[J. Forster]

Think of a carbon microphone.

-John

================


>
> For an example of DC on a variable carbon resistor, consider the direction
> sensing pot of the CDR type antenna rotators!
>
> They have a history of failures but usually last a long time due to the
> VERY small amount of current involved.
>
>
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * k2gkk at hotmail.com *
> * Oklahoma City, OK *
> * USAF & FAA (Ret.) *
> * * * * * * * * * * *
>
>
>
>
>
>> Date: Tue, 30 Jul 2013 15:29:50 -0700
>> From: jfor at quikus.com
>> To: kgordon2006 at frontier.com
>> CC: arc5 at mailman.qth.net
>> Subject: Re: [ARC5] ARC-5 Pot Taper
>>
>> Carbon pots don't much like DC current through the wiper terminal. Think
>> a
>> carbon microphone. Through the track- end to end- is generally OK.
>>
>> -John
>>
>> ===============
>>
>>
>> > On 30 Jul 2013 at 21:32, brianclarke01 at optusnet.com.au wrote:
>> >
>> >> A carbon pot carrying DC would have worn out in a very short space of
>> >> time.
>> >
>> > Please explain. I have never heard of this.
>> >
>> > Ken W7EKB
>