Adaptation of PTBM to SSS Guitars

[ashcatlt]

I’m sorry I don’t see how that mid control is supposed to work. The components are just hanging off the switch but even that doesn’t connect to anything else in circuit. Like that whole switch and all the components on it could be removed and it would make no difference. What are you trying to accomplish with that?

[frets]

Ahhh, I’ll work on it. I’m taking it down so as not to lead anybody down the wrong path. What is intended Ash is to have a midrange shaper within the mix of the PTB. The idea is the Push Pull would be a Volume on the down and a two sided midrange shaper when pulled up on the push pull. Midrange scoopers are a powerful tonal tool. As with the Les Paul version I did, the SSS version would add a dimension to the bass and treble cut. That was my intention. Like I said, it was a long day and I was thinking this out. I’m sorry to have posted something that was obviously not complete.

[ashcatlt]

I’m pretty sure you’re going to need another pole on the switch to accomplish that. In your other thread it was mentioned that the side of that mid control without the inductor was kind of weird. It should be just another treble cut when you turn it that direction. If you just remove that C/R pair, the mid scoop should still work, but have a wider range of sweep. THEN I think we could do the switching thing you want here. Otherwise there’s just too many things that need to switch.

[JohnH]

I'm glad to see a push-pull as part of the mis-shaper device.

While investigating what it can do through the sweep, it seems like although it can do a wide range of interesting -looking tones, it doesnt cover tbe basic tone that a simple volume and tone arrangement can make. So a switch as part of it to fully disconnect it looks to me like a good feature so no expected tones are lost.

Id have thought it would be to pull the knob to engage the circuit, but it could be the opposite.

[frets]

Isn’t the 1.8nF/1M a Mid boost? I was always told that it was. I’m not married to it, just wanted to know given it is traditional to a midrange control.

[ashcatlt]

Well a cap to ground is a lowpass filter. Doesn’t it look a lot like the Treble Cut circuit? The resistor parallel to it doesn’t do much. The value of the cap is about 1/10 the size of your treble cut cap, so the frequency will be about 10x as high, so probably somewhere in the midrange, and combined with the inductance of the pickup, there will be something of a resonant “boost” at that cutoff frequency I guess. We do see some of that with a typical treble cut also, though obviously at a lower frequency.

But wait! I think I figured out the switching thing.

Move both sets of components from the switch lugs to the pot lugs where they need to be for the mid control.
Disconnect the grounded ends of those components and connect them all to one of the upper switch lugs.
The wire from the V pot to ground gets disconnected from ground and moved to the lower switch lug on the same side.
Put ground on the middle lug between the two.
The blue wire to the V pot moves to the center lug on the other side of the switch.
Jumper the top lug on that side to the middle lug of the pot.
Jumper the remaining switch lug to where the blue wire is now.

That should give you mid control when the switch is pushed and normal V pot when it’s pulled.

[sumgai]

Aug 27, 2020 2:55:42 GMT -5 JohnH said:

I'm glad to see a push-pull as part of the mis-shaper device.

Good call, John!

[frets]

Hi Sumgai,
A “Typo” I’m sure. Let’s all say “middy shaper🙀”

[newey]

Middy Shaper?




(I'm standing in for gumbo today)

[JohnH]

Yed dorry for the the typo. Whoever put D next to S on my keyboard wad a bit of a dos

[ashcatlt]

MIDI Shaper

[frets]

Revised. Verification Please