In Part 2, I do some direct recording so we can hopefully hear what the scope has shown us. I'll upload that one in a few days...
Yeah, I'm gonna take my horse to the old town road...
No ... I'm not really ... that would be dumb
Well it comes down to the load that the pickup "sees" (or feeds I guess). Most onboard pres have an active-passive switch and if that's the case then usually that means the vol (and blend) are between the pickups and the pre. So with that set up, the main difference between say a passive jazz feeding the same circuit in a stomp bax and the same jazz with that same circuit in the bass is obviously the cable between the bass and the pre, which will effect the treble response of the bass.I've always tried to wrap my head around the difference between an onboard pre and a pedal pre... and/or your amp pre. Have you ever done tests on that? how much does the cable come into it?
Piezos are a different story, but yes they certainly are very much effected by the load that they feed. In general, you need a very high impedance for under saddle pickups etc so they don't sound very honky and mid-rangey. This usually means a fet buffer or a design that uses an opamp that has fet inputs.My latest set of basses have piezo set ups with two different switchable capacitors.
Cheers Blaine. It strikes me that a lot of guys, (even some guitar techs!) don't have an understanding of electronics schematic diagrams. When you see simple passive guitar circuits written out as proper schematics, not just wiring diagrams, they are far easier to understand.I like the approach you've taken in the video Rob, breaking it down like you have with both the wiring schematic and the results makes it much more understandable. I'll be looking out for the 2nd part.
Ha ha. I know that first part is pretty sciencey, but the 2nd part hopefully consolidates all those traces and stuff with direct recorded samples. Damn upload speeds are a joke, and I've got other video stuff to drop box over the next few days, but part 2 will be up pretty soon...I understood about 20% but I’ll go back and have another go. Really interesting actually.
Sure man. Passive blending (with 2 vols or a blend pot) is surprisingly complex. But I'm planning a few more vids on this topic in the future...If you get time I would like for you to explain the difference between a passive harness in a 2 pickup system (like a PJ setup) compared to an active preamp that has a buffer for each pickup before blending and how the 2 pickups interact differently in each setup (active EQ aside).
Well, in part 2, there's a bit more info on this. My P is actually wired with a no-load volume pot, plus a switched cap type tone pot. Neither of these are connected when dimed, so I can access the pickup directly at the jack with no load. I actually recorded with a 1meg z fet buffer that's built into a jack, so you can hear that 4khz peak. Yeah I quite like that sound, but it certainly doesn't sound like a traditional P that's for sure! FWIW, I have a video on my no-load volume pot. Unfortunately, I recently realised that the input z of the DI I recorded with is much lower than I thought, so the effect is pretty subtle. But in part 2 of this vid, I demonstrate that as well, but with the pickup straight into a 1meg Z.This explains why my favourite sound of my P-bass is when I accidentally wired it straight-to-jack, and why ultimately, I may set up any of my future instruments with at least a straight-to-jack switch.
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