nakedzen
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Everything posted by nakedzen
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I'd rather make these as a universal swap-in for other actives. Changing from 9V to 5.5V would require rewiring (or routing) the battery holder. The noise figures show those have 16dB less CMRR, I think I'll go with the TL071H, it's tried and true, at least for this first project. Those could be interesting if I ever decide for multiple chips, but I do like the form factor I have now.
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I think I'll swap my design for the TL071H, since the availability of LM4250 seems to be sketchy. Same pinout and it doesn't need the bias resistor so I get a cleaner design on the board too.
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That makes sense too. Another thing I noticed, is the ground connection seems to be from the other side of the pcb to the output center pin, and ground from l4250 pin 4 (upside down in the pic) goes through a via to the other side. So probably the entire pcb backside is a ground plane.
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Another thing I just noticed about the pics on electrosmash, it almost looks like the blades of the pickup are connected to the copper of the pcb? Could be just from taking it apart that the pcb tore at those spots but curious anyway. Then there are those yellow parts over the coils on the leftmost pic. Some sort of shielding?
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I usually at least try to avoid fooling myself with audio so I haven't thought about those differences really, you start hearing what you want to hear (best pickup ever!!!?!) I gave the pickups on loan to a friend to mess with them and give me his input. Offtopic but here's a good one: https://www.youtube.com/watch?v=BYTlN6wjcvQ But I feel it is more rewarding to play somehow, like when I swapped an 85 in the guitar it just felt "dry" I guess is the word. A bit more harsh by comparison.
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Go to kimballhardwoods.com if you're in the US. Look no further. If they have nothing in your budget now, check their instagram. They sometimes have sales there.
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Blech, I found the cause of the noise. There was some sort of ground fault connecting to the shielding paint on the guitar. I thought something was off when I got noise even without any pickups connected.
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Well yes and no. The blade style pickup is dead quiet, but the pole piece style not. They're both built identically so I'm not quite sure what's up. So it would be better to disconnect the ground wire from the baseplate in your opinion? I don't have the noisy pickup here atm but once I get to it I could try that. Sorry I'm a complete pleb when it comes to circuit design. But next steps are pretty clear: - PCB with ground planes built around the components to act as a faraday cage. - Solder a proper bridge ground, now I just have a piece of string taped between the bridge and the pickup height adjustment - Shielding on the pickup and pcb - Wax potting
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Couple sound samples. (Metal) Steel bars, alnico 5, brass baseplate Pole screws, alnico 5, brass baseplate Another thought, I've been wondering how a preamp board for single coils would look like? This pcb seems to work when I connect the hot to pin 2 and ground to ground but probably not the best way to do this?
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Could just be the way Emgs are constructed, lower wound mini humbucker coils and steel bar instead of slugs. Although I did read somewhere that the coils are actually wound pretty hot around 10k. Who knows, too much misinformation around. We'll see what happens in the future since the production of LM4250 has ended. Maybe emg just makes copies of it. But afaik the chip shouldn't have any "sound" to it as long it's kept clean and not driven into distortion so any chip works that has the same pinout?
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Thanks! I didn't really have any good ideas for the inlay, so I just went with bass/treble
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I've done lacquer dry sanding with Super Assilex 800 and 1200 grits, then maybe go even to Zona Micron 1800 and 8000, then Meguiars. Those SA papers cut super fast.
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@curtisa You're right, I had them wired wrong on that side. Unfortunately my soldering iron decided to crap out, so I can't truly try how it affected anything, but just by taping the connections I hear it's now about the same in terms of emi noise as the EMG neck pickup in the same guitar. But I think I'll still do a third prototype PCB with the ground planes around the components as a faraday cage, should be much better in terms of noise. My first prototypes only had the ground as traces which isn't really too smart in hindsight.
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I'll need to check how I did them, I can't remember right now. Been too busy fiddling with the pcb layout.
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@curtisa I'm getting pretty much the same amount of emi from the active pickup as from passive humbuckers, from pc cases and speakers. EMG's are dead quiet in comparison. I didn't have ground planes built into the prototype pcb, so that might explain it.
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Almost done now, I have got couple pcb prototypes done. Now all I'm trying to figure out how EMG managed to make their so immune to EMI. I'm guessing at least some sort of faraday cage inside the pickup. Ground planes need work too, I'm guessing it would make sense have it as a star ground on the component side of the pcb? But would adding another ground plane on the pcb bottom side make sense? Only connect it to the output ground. Would this copper layer work as added shielding, or make things worse?
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Thanks! Binding on. Did this one with CA.
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Dirty jack? Try inserting the cable a few times to check if there's any oxidation that's the cause.
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Birch top is pretty porous wood, we'll see how many coats I'll need. Now 2 thin coats of Odie's.
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Testing out the look. Pretty odd looking. Now for a lot of sanding a reapplying dye ad nauseam.
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Starting to look like a bass. Tape is there so I didn't scratch it on the router table.
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Yeah I was thinking if that would work. But it's a start, unfortunately I didn't have too much padauk to test on. I think just doing the outlines and then chiseling the rest would've been the best.
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First try with making inlays with the laser. Didn't really go as planned, should've done the fretboard too with outlines only, it started to burn a bit on the edges. I just filled those with sawdust and ca.
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Sanded back some brown on the top and did the pickup cavities.
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It has come time to decide on pickups since I'll do the cavities next. Original has single coil Jaguar pickups, but I'm sort of leaning towards P90's. No idea if they sound good on bass. :d I guess we'll find out. Top routed flush and added binding channel.
