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Post by frets on Nov 7, 2019 19:12:06 GMT -5
Hello Guys, I’m wiring a volume push pull to be a volume on the down and a Midrange control (Rothstein) when pulled up. I have accomplished the volume and one side of the Midrange. Of course not knowing what I’m doing, I completely forgot that I could not attach 1 to C1. So, the only connection to the switch is 3 to C2. Please see the photos. You can see the white wires where I have 3 to C2 and a dangling chad where I was attempting to cross from C2 to C1 (as you know, it did not work) Can what I’m doing be done? And if so, how do I wire the switch? Again, Volume down, Rothstein up.    |
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Post by thetragichero on Nov 7, 2019 21:00:49 GMT -5
silver thing your inductor or another cap?
one of the issue with any sort of passive circuit is that they all decrease signal (some drastically more than others)so unless you've got some recovery gain the only way to "boost" the midrange is by cutting treble and bass
if you're gonna have a recovery stage and power source, you might as well put it in a little metal box at your feet. a tubescreamer works smashinglu at boosting the midrange
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Post by frets on Nov 7, 2019 21:33:05 GMT -5
Trag,
This mod is a Rothstein Midrange Scoop, booster, enhance etc., etc.. It has a .039/270k running to a 1.5H inductor. The other side has a .0022/1M. It controls frequencies from approximately 500Hz to 2000Hz. You hear that as you rotate the pot from 0 - 10 with the right side controlling the lower mids, and position 10, the upper mids. I really really like this control and think it is actually far more useful than a tone pot. Not only does it scoop the mids, with a regular tone pot, it can serve as a passive bass or treble cut to some degree.
The silver thing is a .0022 K40y-9 paper in oil capacitor.
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Post by thetragichero on Nov 7, 2019 22:00:44 GMT -5
do you have a schematic or layout you're working off of? that would be helpful
so are you looking to replace a master volume or individual pickup's volume when the pot is pulled up?
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Post by sumgai on Nov 8, 2019 1:35:17 GMT -5
frets, I’m wiring a volume push pull to be a volume on the down and a Midrange control (Rothstein) when pulled up. ..... Can what I’m doing be done? It can be done, but only if you like doing projects that end in tears. Simply stated, you can't disengage the Volume control with a switch, and have those same wires do something else - what happens to the signal that's expecting to go through the Vol pot, and on to the output jack?  In short, you're proposing to have either control of the signal's Volume, or control of the signal's tonality, but not both together. Seems like a strange way to control one's guitar, IMHO.
Rothstein uses the p/p on a Tone control, switching between standard treble-cut and mid-scoop - that's doable, and possibly desirable, but the Vol pot is never compromised. I believe you'll want to revisit this idea, before you harm the environment any further with more burnt solder vapors. 
sumgai
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Post by thetragichero on Nov 8, 2019 12:34:00 GMT -5
i think it could work with a third pole but I've never seen a push/pull like that
you could get it to work with an s-1 switch but frankly i think using a tone pot for this is a lot more intuitive
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Post by reTrEaD on Nov 8, 2019 12:59:27 GMT -5
i think it could work with a third pole but I've never seen a push/pull like that you could get it to work with an s-1 switch but frankly i think using a tone pot for this is a lot more intuitive You can accomplish just about anything, given enough poles. Whether or not changing the action of a pot from a volume control to a midrange control is possible kind of depends on the wiring of the midrange control. A schematic would definitely be needed. Pics don't tell enough of the story. Btw Trag, the inductor is visible in the second pic in the OP. You can see the metal frame and the blue plastic covering the windings, just north of the shaft/bushing. |
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Post by thetragichero on Nov 8, 2019 14:13:44 GMT -5
yeah i saw it after the response
's what i get for posting and driving
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Post by sumgai on Nov 8, 2019 21:01:55 GMT -5
No matter how many poles might be used, this illustrates the basic problem:
Even if you use "extra" poles to shunt around the Vol pot such that it then runs at WOT, then the usefulness of the control is null and void. IOW, if you can't control the volume whilst controlling the Black Box functionality, then how are you gonna keep the decibels down below the ear-bleed level? Reach back to the amp every time you pull up on the knob?
I trust we'll be putting this one down soon, eh?
sumgai
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