Post by ChristoMephisto on Oct 27, 2014 23:07:08 GMT -5
I'm looking at Hastings blender mod that switches between the middle pickup parallel with a volume pot and the middle in series with a blend, except I would like to blend the parallel into the master volume, not with it. Is a 1 meg pot too large for blending into a 1 meg volume pot? I plan on wiring it as a rheostat going to ground, but on some of the parallel blend mods I've seen the last tab isn't grounded like a regular volume pot. Those also blend the middle pickup into a master volume. I can work the switching into my wiring but was wondering if I should ground the middle blend pot like in the diagram for parallel or leave it?
I managed to find a 1 meg stacked CTS pot from '62 (from an old reel to reel) and want to use it in my Squier Bass VI, which uses two 1 meg pots, for a blend mod. Have the stacked in the front a tone at the back.
Please post a link so that the rest of us can look at it, too.
I plan on wiring it as a rheostat going to ground, but on some of the parallel blend mods I've seen the last tab isn't grounded like a regular volume pot.
In rheostat wiring, the third lug isn't grounded, but is left unwired. In that mode, the pot is functioning as a variable resistor, i.e., as a rheostat. If you ground the third lug, like a volume pot is usually wired, you have made a voltage divider (i.e., a potentiometer).
As far as the 1M value, that seems large given that the other pots are all 1M as well. As you increase the pot value, you increase the brightness, but the trade-off is less variation over the range of the knob. As the pot value increases, at some point it will be "all or nothing"- turning the knob only slightly will take it from basically "off" to "full on". This isn't the action you want from a blender, certainly.
I'm not sure if this sort of thing can be graphically represented using Spice. I'm sure JohnH will weigh in on that. But a graph might help you decide if it will work as you want it to.
As for the 1 meg pot, I had a feeling it maybe too large for certain applications, like good for parallel but too large for in series wiring. Possibly the 1 meg for parallel and a smaller one for series, or wire the middle blend as a voltage divider when in series. Has anyone tried a smaller pot when blending in parallel, ie 500k for the master and 250k for the blend?
Just trying to find a good mod that uses the stacked pot beyond VTT or VVT. It's already wired in series, parallel and a coulpe hybrid s/p combos.
Post by ChristoMephisto on Oct 29, 2014 5:29:52 GMT -5
That one part is going to be a switch for the middle pup where up is parallel/sc and down is series on a dpdt slide switch. The neck n bridge are on two other switches, dpdt center off, that works the same, up is parallel/sc, down is series, and middle shuts it off. I posted a wiring diagram on another thread recently 'Bass VI -series or parallel' Except I plan on changing it so it's middle into the the other pups when in series.