tricky wiring job - please help

[Ou7shined]

I've got a set of EMG JV's and an Aggie OBP3 but no idea of how to knock them together (I'm assured they will go ). I've got a pair of 25k pots for the EMG's so that I can have vol/vol/treb/mid/bass. The Aggie is currently wired for [url="http://www.bestbassgear.com/wiring-diagrams/obp3-v-bl-t--mpp-b.pdf"]blend and single vol[/url]. I have a wiring diagram for a [url="http://www.bestbassgear.com/wiring-diagrams/obp3-v-v-t--mpp-b-ap.pdf"]dual vol[/url] but obviously it doesn't include an option for active pups.

I want to keep it all 9v for now. It would also be nice to utilise the bypass switch circuit somehow too. Can I have a single toggle switch to do this and still keep the pups active?

Please help. Quite tasty project in danger of being completed.

[BOD2]

The basic circuit is probably simpler than you think -

[url="http://emgpickups.com/downloads/wiringdiagrams/J_models1.pdf"]http://emgpickups.com/downloads/wiringdiagrams/J_models1.pdf[/url]

The wiring of the JV pickups is exactly the same as that shown in your OBP-3 diagram except that they have the additional connection for the battery, which is shown in the diagram above.

Here is the wiring info from Aguilar

[url="http://www.aguilaramp.com/pdf/support_wiring_obp3.pdf"]http://www.aguilaramp.com/pdf/support_wiring_obp3.pdf[/url]

One of the diagrams includes a bypass switch. I think that switch wiring should work for you as long as you provide a separate battery wiring path (i.e. one that doesn't go through the switch) to the pickups.

One point of note, though. A bypass switch is usually provided for passive pickups so that if the battery fails you can still play. With active pickups that's not an option. In theory, the sound of the pickups bypassed should be very similar to teh sound with the preamp EQ set flat. If that was the case then the bypass switch wouldn't really be necessary. Just trying to save you some work here - these mini switches are fiddly to solder and there's a lot going on with the OBP-3 wiring as it is.

One last point - when I wired up my OBP-3 I found that a couple of the wires were colour codes slightly differently to that shown on the diagram. Once I realise this it was fairly easy to identify which ones were which - but check yours before you start.

Good luck !

[Ou7shined]

Cheers yeah it's not as scary as I thought. I had a more serious look at it last night and I think I've cracked it. However I can't figure out how to wire the bypass switch with the dual vol set up (it's that damn blue wire).
I want to fit the bypass for 2 reasons. Firstly I might at some point put passives back in (although these JV's sound pretty good so far) and secondly I could use the bypass as a sort of programable switch to jump from a preset to flat in an instant during live work.

[BOD2]

If you look at the Aguilar diagram for two volume controls, the blue wire takes the output from both volumes and into the preamp module.

Now if you look at the Aguilar diagram with the bypass switch, take the wire that joins both volumes from the "two volume control diagram" and connect it to the top left contact on the switch. The rest of the switch is as shown in the diagram.

In one position, the switch will connect the volume wires to the preamp. In the other position the blue wire from the peamp is earthed (switched off) and the volume wires connect to the tip of the output jack via the jumper wire on the switch.

[Ou7shined]

I was staring at that for ages last night scared to make a judgement and blow the thing. I doesn't help not having the switch here yet to check it out.

Cheers mate you're an absolute star.