need help with wiring EMGs with all kinds of optio

[ang3lus]

Hey all

this is the wiring diagram i want to use with my EMGs since i want to run them at rating of 18v and 9v together (switch between them with the SPDT on/on or do i need a DPDT on/on ?)

Problem is, i have no idea how to wire the DPDT or the SPDT
cause i have no idea what those legs mean



Can anyone help me with wiring them ?
(both SPDT and DPDT iin the pictures please, the 2nd one is used to turn off the SPC and RPC while not in use (DPDT on/on for this right ?)

would be grateful if someone can post me a wiring

Thanks !

P.S
B1 and B2 = Battery 1 and 2
PP vol = Push/pull switch for splitting EMG 89

[sumgai]

ang,

Hi, and to the forums!

I have to ask, why do you wish to switch between two battery voltages? What are the benefits to this? And finally, are the pickups and the added circuit boards all capable of running at both voltages?

There are a few errors in your diagram, but we can let them go for now. One of us will be happy to draw up a working diagram, once we (or at least, I) know about the voltage questions above.


sumgai

[ang3lus]

Hey,

Thanks !

well, that's the problem, I know that most emg products are rated 9v-27v, but that's only mainly for the pickups, i've sent them an email and am waiting for a response.

I wish to switch between two battery voltages because 18v are more clean and bright souding (there is more headroom and dynamics to the pickup, so i've heard, but i'm kind of a tinkerer so i must try, hehe, but if you build something, build it right the first time right ?)

Let's assume for one sec that they don't support 18v, is there a way to make it work anyway ? will i have to use a seperate battery for them ?

Thanks again !

[sumgai]

ang,

Well, if the EMG's are rated to handle a voltage range of 9-27 volts, then there's no problem with them, of course. It's the other two modules I'm worried about. In the event that they can't withstand the higher voltage, then yes, a dual power supply (two batteries) will be called for. Not hard at all, but you'll be replacing one battery more often than the other.

Yes, it is generally a good idea to do things right the first time. However, it is also an error to install a control that will never be used - in this case, because there was so little difference between the two voltages. I'm tempted to advise you try this out first, before you mount everything permanently in your axe. Just let the goodies dangle out from under the pickguard, and see what happens! ;D Then you'll know if you should/should not mount a dual-voltage switch.

Waiting on whatever you determine......


sumgai

[ang3lus]

well
my teacher (which has a very keen ear) says it's very hard to get a good distortion with 18v, because the sound is so bright compared to 9v.

he suggested i put this 9v-18v switch and about the other two modules... well.. i hope EMG will reply with an answer soon cause i don't want to risk frying them.

[sumgai]

ang,

I thought the EMG issue was settled - you said they can handle 9-27 volts, no?

Or are you speaking of the two modules, are they from EMG too?



sumgai

[ang3lus]

the pickups can take 9-27v easily, the EXG and RPC (marked as expander and RPC in my circuit) are still unknown, still haven't received a response and i don't wish to fry them. i'll just use an on/on switch to switch them on and off and a different battery for them, i have enogh space for 3 batteries in my cavity. (need on/on cause i need the signal of the guitar still running to the jack while switching off and bypassing the 9v battery)

Thanks

[sumgai]

ang,

As I was settling down to do some drawing, I thought I'd check EMG's website for a diagram of the pins on their modules. What did I find, but a diagram that's already been drawn for you! Go here: www.emginc.com/downloads/wiringdiagrams/EMG-SPC-RPC-EXG.pdf, and check the top diagram on the last page. It's for two pickups, two volume controls, and only one module. You can wire in a second module by taking the RPC output (green) and hooking it to the EXG input (white). The rest of the wiring is unchanged. (BTW, that same document tells us to put the RPC before the EXG.)

If you still want 18volt operation, then check back with us. However, I think if you try this simple way first, you'll find that you can get both clean and distortion, without having to resort to a higher battery voltage for the clean signals. After all, this is one of EMG's claims to fame, the battery operation of a powerful pickup that doesn't distort any more than a passive one.

HTH


sumgai

[ang3lus]

Hey thanks.
Though i figured out myself how to do that 18v-9v thingy. it ain't that hard once you assign some logic to it, hehe.

thanks for that RPC/EXG diagram, i would have connected the EXG before the RPC, hehe.

I've decided that i will run the circuit with 3 batteries, two for the pickups one for the modules. the batteries will last like 500 hours only with those modules and these type of pickups, adding another one to run the circuit will add like 400 hours more.

Thanks for your help sumgai, much appericiated !

[ChrisK]

Problem is, i have no idea how to wire the DPDT or the SPDT cause i have no idea what those legs mean

Got a multimeter? If not, go buy an inexpensive one, wiring without one is like driving with yer eyes closed.

Once you have one, measure the switch contacts (all poles to all poles) in both positions and learn thereof.

'Tis the beginning of (electronic) knowledge.

[UnklMickey]

chrisk said:

...wiring without one is like driving with yer eyes closed ....

Chris,

you say that, like it's a bad thing.


LSH...

[sumgai]

ang,

Your plan sounds fine to me. Just take it easy when you're making room for all those batteries, you don't wanna hog out so much wood that you end up sounding like a hollowbody Stella from the 1960's.

(And yes unk, AAMOF, I am saying that such a sound would be a bad thing! ;D)


sumgai