BTC control with passive push/pull tone and stacked vol/vol
Hi, guys. Recently I've wired a BTC control to my passive P/J Barts (not single coil) in a standard way - two vol and BTC, just tried it. I liked the sound but still want to use my bass in passive mode. I'm not a electronic type of guy and I just follow diagrams. So the problem is how to connect the stuff. I have three holes for pots and don't want to drill another one. I'm thinking of:
1. Stack vol/vol
2. Passive Tone push/pull (sort of bypassing the BTC control and may be bypassing the tone in active mode) not sure on this.
Could it be done and what type of pots and a cap I need. At the moment I use 250k with 0.047uf cap.
Please, I realлy need some help with schematics, cause can't figure it out by myself.
Thanks in a advance, TB's. :help:
I suppose, that the answer I'm looking for it's not easy, but I still have a hope that someone has proper decision for the schematic. Please help. :bawl:
Do you really need/want a passive tone control when in passive mode? If it were me, I wouldn't. It would make the wiring somewhat easier that way too. But it's certainly possible to do exactly what you're asking as well. I don't have a diagram handy; sorry - hopefully Saint Line6Man or Saint Stealth or one of the other wiring diagram Saints will come along soon.... :)
Thank you for the answer ctmullins, I'm really not sure with the passive tone. When I play with the bass how it is, meaning passive, I use the ton pot on full turn (I like highs), so is that mean that resistance will be the same without the tone pot and the cap, I think not or could be wrong or just talk nonsense??? Is the highs will be the same as they are now in passive configuration? This is my only concern...
Thank you for your answer again and the hope you gave me!!!
w'out a tone pot (straight to jack) should have just a bit more highs avail because just having a tone pot will bleed a little off.
then you can tweak with the amp to taste.
One of my ideas is to use the bass parallel with one active bass, so not to tweak the pedals and the amp in live situation. At the moment I think that mine main problem will be the ground issue, because of the not grounded EMG. Is that could be a problem if I leave the ground wire to the bridge? The purpose is to have to different basses with two almost equal outputs (witch I can control from the vol pots on them) To have a passive/active mod on this one I'm talking about is a extra that really want, cause the bass itself sounds very nice in passive.
Thank you for trying to help, JustForSport!
It can be done- pretty much as you've chosen,
V/V, push/pull tone (to bypass the pre [switch between tone pot and pre]), Stacked B/T.
I've learned an lot here on TB, thanks to the many generous contributers, and will help if I'm able,
But I've no wiring diagram for this, just lots of bits and pieces that I've saved.
As prev mentioned: hopefully Saint Line6Man or Saint Stealth or one of the other wiring diagram Saints will come along soon....
Ok, I have some new info about the treat. I already have the schematic so its time to try it. A guy from the local forum helped me to figure it out. Still don't have the pots - stacked vol/vol and the push/pull/DPDT. I'm waiting for the BTC n a few days to be deliverеd and I will try to do it with two vol and one DPDT switch, just to be sure it's working. The guy warned me about a problem that might appear. Switching off the BTC could bring an unwanted noise, because of the input of the BTC which is "opened" in still working preamp in passive mod. If there is such a type of noise it will get to the jack, even more noticeable (with more level) after the BTC. I'll try the schematic and write about the result. :)
Does EMG sell a push/pull pot? I don't think they have a active/passive setup.
Wiring is pretty much standard VVT with preamp and active/passive switch. I'll post a diagram when I get around to it.
Pot values should be appropriate for high impedance pickups. 250k or 500k with a 0.047uF cap, or whatever other value you might prefer.
Thank you guys,
I already tried the schematic and the noise I was warned about, appeared. So I need a little more to eliminate the hum. I'll try to connect all the ground wires in one place - so called "star grounding". This and proper shielding could help. The bass has shielding only over the pickguard where the pots are. I am not gonna use a tone pot. There is not enough room for threе bigger pots so I'll need one to be "normal" size to put the battery under it. The idea is to use vol/push/pull, vol and BTC. I already have both schematics with tone and without it:
and the bass cavity:
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