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  1. bassnut

    Source for Lexan resin?

    We're using pre-dyed, jet-black Lexan. I was able to get 50lbs of it. The dryers are pretty good I'm told with dewpoint control etc. The molding machine has more than enough pressure available and the die is preheated. Location is Los Angeles, California. I found this interesting from...
  2. bassnut

    Surface Finish On Polycarbonate

    Thanks patprimer. I'll try to post a photo link soon. There was a problem with silver streaking (splay) but that seems to have been resolved. I'll try to find out more about the material. It did come pre-dyed from the supplier. Nothing else was added during the molding process.
  3. bassnut

    Surface Finish On Polycarbonate

    My injection molding supplier is having a hard time getting a good finish on the critical face of my parts. The finish appears grainy and with magnifaction small, almost microscopic craters are visable on the surface. The surface of the die is polished smooth however. Are these being created by...
  4. bassnut

    Source for Lexan resin?

    Where can I get a small quantity of black pre-dyed Lexan 141? The company doing some injection molding for me is having a hard time getting a good finish on the parts. There are tiny specks of what looks like splay on the face. He's having a hard tome getting a clean black finish mixing black...
  5. bassnut

    Insulating Steel Laminations

    I've got some steel lamintaion strips that are used in a guitar pickup to cut down on eddy currents when transfering magnetic flux from the magnets to the pole pieces. They're about .027 thick and stacked about 8 high. I've been insulating them with varnish and it's a little too labor intensive...
  6. bassnut

    Alnico vs Ceramic in Guitar Pickups

    You guys might get a kick out of this: http://www.q-tuner.com/index.shtml This design is using neodymium. Interesting text...
  7. bassnut

    Alnico vs Ceramic in Guitar Pickups

    Back to my original question. I like the sound of the design I'm making. Many people do. The problem is that I don't know why it sounds "better" than other designs. I'd like to be able to understand and communicate this to people and steer away from any sort of "hype". I'd like to be able to...
  8. bassnut

    Alnico vs Ceramic in Guitar Pickups

    Gentlemen. Thank you all very much for responding. Truthfuly I'm having a hard time with the physics dialog. A bit over my head. Actually I'm thinking that the direction you have taken would best be discussed using quantum physics... Pickup making is a "black art" and nobody seems to...
  9. bassnut

    Alnico vs Ceramic in Guitar Pickups

    "...the "Third Quadrent" charasteristics of the magnet. Ceramic is basically linear in recoil permeability where Alnico is quite nonlinear." Are you talking about a hysteresis loop? I just did a Google search on "3rd quadrant, recoil permeability"
  10. bassnut

    Alnico vs Ceramic in Guitar Pickups

    Could you explain that please...to a layman? This may be what I'm actually asking about. I was just writing a follow-up to nbucska's response: ----------- Thanks. I've heard this argument before too. The conductive Alnico will invite eddy currents which may rob high freq and dampen the sound...
  11. bassnut

    Alnico vs Ceramic in Guitar Pickups

    This is an old discussion among guitar players and pickup makers who are into "vintage" hardware. The usual belief is that Alnico V sounds "sweeter" in a pickup and ceramic is harsh. I've heard people say it depends on the design and not the magnet...flux is flux. My question is that if Alnico V...
  12. bassnut

    Audio Circuit Design Software

    Thanks guys. The thing is that, I'm not sure I need anything so involved. The wiring harnesses are simple compaired to what I'm looking at in these software info pages. Couldn't I just assume a single AC frequency as a signal from a pickup going into the switches, volume pots, tone pots, caps...
  13. bassnut

    Audio Circuit Design Software

    OOops I realize now the you're IRstuff not TTFN Sorry about that. I was they had an editing feature here. FH
  14. bassnut

    Audio Circuit Design Software

    Thanks again TTFN I understand (theoreticaly) that there is a certain capacitance/impedence from the amp/cable affecting the circuit. Grounding to pot cases is quite common in guitar circuits. Here's a simple diagram of a Gibson circuit showing the technique. The real cool thing is to have the...
  15. bassnut

    Audio Circuit Design Software

    I should have included words like "AC" and "Analog" in my original question. I suppose that's not always assumed with audio circuits. Here is a diagram one of my customers sent me. He's customized a Fender Jazz bass with one of my pickups a la Barry Oakley from the Allman Brothers. I know this...
  16. bassnut

    Audio Circuit Design Software

    Do you have to have Orcad seperately with this? I looked at the website and found it a bit confusing. A little over the top for a "Ludite" like me. My background is in mechanical design but I'm presently making my own single coil pickups and selling them on the internet. I still have a hard time...
  17. bassnut

    Audio Circuit Design Software

    Is there software available to design and test simple audio circuits such as for electric guitars etc.? All that I'd require would be to plug in different value pots, caps, resistors, wire and some switches and maybe a coil (pickup) or two. In short...nothing to fancy.
  18. bassnut

    Laminates, eddy currents, hysteresis, hysteria etc.

    Right you are! I guess I was thinking of fundimentals. Even then I may be off... I'm still trying to understand what's happening with the magnets,laminates and coil at these higher freq. There's a few different principals that come into play and they keep changing with freq. i.e. hysteresis...
  19. bassnut

    Laminates, eddy currents, hysteresis, hysteria etc.

    Thanks. The frequency range on the bass guitar is between 40Hz to around 3KHz. What happens to these currents at the higher frequencies? I read somewhere that the ability of the laminations to resist eddy currents lessens or ceasses completely with the insulation acting as a dialectric and the...
  20. bassnut

    Laminates, eddy currents, hysteresis, hysteria etc.

    I was afraid of that. The tape would cause yet more eddy currents right?

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