Can somebody give me a schematic for this?

[JHN]

I'm sure to some of you it's child's play.So I recently remembered the L-pad thing thanks to some posts.Now this is what I'm thinking:
Ibanez RG550 stock middle sc and distortion mayhem set for neck and bridge hbs.1 switch to lower output in BOTH pos 1 and 5 ONLY.Same splits as usual in positions 2 and 4.If possible without affecting the output in sc mode for the humbuckers in pos 2 and 4.So basicly the same splits-configurations in positions 2 to 4 but with a flick of a switch normal or lower output mode for the humbuckers.Plus i would like to go to about screaming deamon output for bridge and about overwound paf for neck when the pad is engaged.So -3db,or how much attenuation do you reccomend for such a result?I think this change in output will help me get 2 modes in feel actually as it will change both the output and the amp's front end compression sonic signature.

 

[Artie]

Re: Can somebody give me a schematic for this?

Here's how you'ld wire a DPDT to attenuate two humbuckers at once:

The "R" values for each side can be independent. So, you could have -3db for one pup and -6db for the other. -6db is the value that should match the output between single and humbucker.

Connect the black wire of each pup to the top of the switch. Take where it says "out" to your normal 5-way, or whatever selector switch you use.

Btw: In that pic, if you use a push-pull, the attenuation will be in when the PP is down. If thats the back of a DPDT toggle, the attenuation will be in when the handle is "up". Reverse top and bottom lugs to get whatever functionality you prefer.

One last thing - those values assume you're using 500k pots. I can post the formula's if you want to calculate any value attenuation with any value pot.

 

[JHN]

Re: Can somebody give me a schematic for this?

A million thnx that's what i was looking for :thanks: :yourock:
Now do you think -3db's are enough to bring sh6b levels to screaming deamon territory and likewise sh6n to paf or maybe a lil more?Mmmm just in case i would realy appreciate the formula if needed to experiment a little

 

[Artie]

Re: Can somebody give me a schematic for this?

3db is a fairly subtle cut. 6db is the difference between a humbucker and a split humbucker. I used to think it was 3db, but thankfully forum bro TwinReverb straightened me out on that one. I had the wrong formula.

You may just have to try a couple values to be sure. Gimme a sec, and I'll post the formula.

 

[Artie]

Re: Can somebody give me a schematic for this?

First, you need to figure the "K" factor. Its just 10 raised to the power of 20 divided by the db loss you want. Since its a constant for any given db, you can use a table or just look them up.

Once you have the K factor, the formula is fairly straightforward if you have a cheap calculator:

"Z" is the impedance you're looking into. So, if you use 500k pots, use 500,000 for Z. Likewise, use 250,000 for 250k pots. Don't leave off the zeros within the formula.