And More: http://www.prodigy-pro.com/diy/index.php?topic=27212.5;wap2
On 2/11/2011 11:56 AM, Bwana Bob wrote:
> Here's a helpful link that I found:
> http://geofex.com/Article_Folders/potsecrets/potscret.htm
>
> 73,'
>
> Bob WB2VUF
>
> On 2/11/2011 2:28 AM, Dr. Gerald N. Johnson wrote:
>> Digging out the data sheets from that maker, it shows pots with 1/4"
>> shaft and 3/8" bushing, choice of two bushing lengths. That's on the
>> data sheet offered by Maplin. Digging deeper the factory data sheet
>> shows a reverse log pot can be had. http://www.omeg.co.uk/p20data1.htm
>> Whether in quantity one I don't know.
>>
>> However if the pins don't match the board anyway, it might be handier to
>> go with a smaller diameter pot and wire leads. I've not checked those.
>>
>> I don't think I've see a reverse log taper pot offered lately in US
>> catalogs that I've wandered through like Mouser. Allied doesn't offer a
>> dual pot of any value. But then Allied has never recovered from being
>> owned by Radio Shack. Newark neglects to show mounting and shaft
>> dimensions on line. Useless.
>>
>> 73, Jerry, K0CQ
>>
>> On 2/10/2011 2:17 AM, Steve Hunt wrote:
>>> Charles,
>>>
>>> Thanks for the suggestions. I see a couple of problems:
>>>
>>> * The pot mounts directly to the PCB, so swapping the ends means cutting
>>> tracks which I'd prefer not to do at this stage. Of course if I modified
>>> it for panel-mounting then it would be easy.
>>>
>>> * The front panel is marked with an "Out" position with the knob fully
>>> CW; in that position the AF frequency of the notch is above the filter
>>> passband. Reversing the "sense" would mean that in the "Out" position
>>> the notch is still within the passband, albeit at the LF end and maybe
>>> not too noticeable.
>>>
>>> All of this makes me wonder why TT went to the trouble of using a
>>> reverse log pot. It would have been as easy - and arguably more logical
>>> - to have the control work the other way round: i.e. the "Out" position
>>> full CCW.
>>>
>>> 73,
>>> Steve G3TXQ
>>>
>>>
>>>
>>> On 09/02/2011 22:49, Charles P. Steinmetz wrote:
>>>> Steve wrote:
>>>>
>>>>> I can't think of any simple way of "fudging it".
>>>> You can swap the "end" contacts of the pot (i.e., cross the wires
>>>> that connect them to the PC card). This will restore the original
>>>> linearity, at the expense of lower frequencies being clockwise and
>>>> higher frequencies being counterclockwise with the knob.
>>>>
>>>> Best regards,
>>>>
>>>> Charles
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> TenTec mailing list
>>>> TenTec@contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>>
>>>>
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1204 / Virus Database: 1435/3436 - Release Date: 02/11/11
>>
>>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1204 / Virus Database: 1435/3436 - Release Date: 02/11/11
>
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|