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Post subject: Blender pot construction
Posted: Sun Oct 18, 2009 6:38 pm
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Dear friends is it possible to use a no load 250k tone pot as a blender,and if it is,is all that is required to do so bending the right leg to the body and solder it to the body as ground?Thanks for any help.


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Post subject: Re: Blender pot construction
Posted: Tue Oct 20, 2009 6:32 am
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wingman111 wrote:
Dear friends is it possible to use a no load 250k tone pot as a blender,and if it is,is all that is required to do so bending the right leg to the body and solder it to the body as ground?Thanks for any help.


Yes to your first question.

As to your second question, it depends on how and what you want the pot to blend. In the particular orientation you've cited, presuming you are assigning the description of the right leg as viewing the pot with the shaft pointing to the floor, the load assigned to the pot will never be completely out of the circuit. This would be say for example, how one of the volume pots for one of the pickups in a Jazz Bass's wiring orientation works. The incoming load goes to the center leg and the load out is soldered to the left leg. In effect, what's going on here is a dialing down but not out of a humbucking coil as either pickup in a Jazz bass is RW/RP to each other. Note that the pot itself still impresses resistance into the circuit unless of course, it is on '10'.

On the other hand, if you want the load completely out upon demand, you would not solder that right leg at all. Rather and again, viewing the pot with the shaft pointing to the floor, you would solder the load as incoming to the right leg and then the center leg would be used as the return to the circuit; the left leg not being used at all. In this configuration however, the pot would work counter or anti clockwise where dialing down to '0', the load increasingly is sent back into the circuit whereas on '10' the no-load pot would literally short out, thereby totally disconnecting the load assigned to it and the pot's resistance as well. An example of this is the now, very common Strat blender pot wiring. With this kind of configuration, I recommend and use myself, a reverse taper no-load pot as it works clockwise in this scenario. Of course, the right leg would be unused and the left leg would be in this case.

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Posted: Tue Oct 20, 2009 7:29 am
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Thanks Martian,I was hopeing you would chime in with your knowledge of all things electrical.When using the reverse taper no load pot as a blender can it be wired as in the Fralin diagram?Thanks again for your help.Craig


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Posted: Tue Oct 20, 2009 7:48 am
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Craig,

Glad to help.

Per the Fralin diagram, you would no longer use the left terminal as the 'load in' terminal. Rather you would use the terminal all the way on the right instead. The middle or center terminal would remain unchanged.

It should be noted that I've never seen a reverse taper, no-load pot for sale, only reverse taper, of course. I make my own no-load pots and have done so for years.

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Posted: Tue Oct 20, 2009 8:08 am
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Martian thank you for the great information,you are truly a great asset to this board,thanks again,Craig


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Posted: Tue Oct 20, 2009 8:15 am
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wingman111 wrote:
Martian thank you for the great information,you are truly a great asset to this board,thanks again,Craig


Thank you!!!

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