[Boatanchors] Potentiometer Size

[J. Forster]

Most of the volume control pots are about 1/2 W. They were pretty much the
standard in 90%+ of radios I've seen. The A-B ones might be higher, but
they were only used in high end (mil) gear AFAIK.

FWIW,

-John

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


> Hi John,
>
> Agreed.  The important word was "estimate".  Guess I should have said
> "by inspection of the schematic."  The good news for Bill is that
> virtually any logarithmic or "audio taper" pot, that physically fits, is
> going to work just fine.
>
> Al
>
> On 7/9/2010 6:25 PM, J. Forster wrote:
>> You really should not put DC or high voltage AC through a pot like that.
>> It was never meant for that kind of service.
>>
>> At a semi-educated guess, I'd think 1/2 Watt max.
>>
>> -John
>>
>> ==============
>>
>>
>>
>>
>>> Bill,
>>>
>>> I'd try to estimate how much power it's going to dissipate, and back
>>> into the answer.  For instance:  500 volts (squared) divided by 500K
>>> ohms = 1/2 watt.  It's unlike that a half meg audio pot is ever going
>>> to
>>> be subjected to any significant power.
>>>
>>> Al
>>>
>>> On 7/9/2010 3:55 PM, Bill Stewart wrote:
>>>
>>>> Is there a rule-of-thumb to indicate the wattage of a potentiometer by
>>>> its physical dimensions?  I'm trying to figure the wattage of a 500K
>>>> audio pot. that's about 1  1/16 " dia. by about 1/2 " (pot. only,
>>>> switch
>>>> is additional) long.
>>>>
>>>> Thanks, Bill K4JYS
>>>>
>>>> ______________________________________________________________
>>>> Boatanchors mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Boatanchors at mailman.qth.net
>>>>
>>>> List Administrator: Duane Fischer, W8DBF
>>>> ** For Assistance: dfischer at usol.com **
>>>>
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>
>>> --
>>> Al Klase - N3FRQ
>>> Jersey City, NJ
>>> http://www.skywaves.ar88.net/
>>>
>>> ______________________________________________________________
>>> Boatanchors mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Boatanchors at mailman.qth.net
>>>
>>> List Administrator: Duane Fischer, W8DBF
>>> ** For Assistance: dfischer at usol.com **
>>>
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>>
>>>
>>
>>
>
> --
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
>