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  1. Replies
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    Sticky: Micha, When making low impedance pickups with...

    Micha,

    When making low impedance pickups with thick string loop wire, look up on the web the "skin effect" This skin effect says that higher frequencies do not penetrate fully to the core of...
  2. Replies
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    Sticky: Yes. That is why when touching ungrounded...

    Yes. That is why when touching ungrounded strings the noise can increase. Some noise can be due to the orientation of the instrument to the noise source. However, in some cases, a whole area can be...
  3. Replies
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    Sticky: bea, Look closely at the round string end and...

    bea,

    Look closely at the round string end and see the center string core wire wrapped around the round string end. Even if the outer wrappings are not metal, the center is attached to the round...
  4. Using the GMR sensor instead of a transformer,...

    Using the GMR sensor instead of a transformer, you could use the technique that I described in the thread "Moving coil pickup for the technically curious"...
  5. Replies
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    Sticky: Nick, Yes, please post a photo so we can see:...

    Nick,

    Yes, please post a photo so we can see:
    1. The thick metal string loop, identify it's total length, size and metal type
    2. The magnets within the string loops, plus identify their...
  6. Replies
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    Sticky: nick, See this...

    nick,

    See this thread:https://music-electronics-forum.com/showthread.php?t=14952&page=2&highlight=technically+curious

    Go to post number 1 that I started in Sept 2009.

    Look for small audio...
  7. Replies
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    Sticky: Nick, If you are targeting feeding this pickup...

    Nick,

    If you are targeting feeding this pickup into a high impedance amp, you will need coils with 5,000 to 10,000 turns of very fine wire, assuming that there is sufficient magnetic coupling to...
  8. Replies
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    Sticky: nick, All pickups benefit from physical design...

    nick,

    All pickups benefit from physical design or appearance but must behave according to the laws of physics or in this case electromagnetic induction. Typical guitar pickups are simply voltage...
  9. Replies
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    115,895

    Sticky: Singer15, The .25 inch round magnets are...

    Singer15,

    The .25 inch round magnets are spaced about .125 inch apart with the same poles facing up, with the strings directly above the magnets. As an experimental alternative try using 7 magnets...
  10. Replies
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    Sticky: Singer15 and others interested, You ran into...

    Singer15 and others interested,

    You ran into the classic problem of neod magnets being too strong under thicker wound strings with magnetic outer winds. Most acoustic strings only have their solid...
  11. Sam, The Alumitone pickup uses the aluminum...

    Sam,

    The Alumitone pickup uses the aluminum metal frame of the pickup as the low resistance ¬“string loop¬” feeding two coils mounted under the frame that each have about 15000 turns of very fine...
  12. Replies
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    115,895

    Sticky: Helmholtz Coil inductance varies by the square...

    Helmholtz

    Coil inductance varies by the square of the turns differences. If you double the number of turns, the inductance is 4 times higher. If you have a coil with 10 percent more turns, the...
  13. Replies
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    Sticky: Hemholtz, If you look at the schematics of the...

    Hemholtz,

    If you look at the schematics of the low impedance Les Paul guitars, you will see volume pots 100 times lower in value, 2.5 K Ohms versus 250 K Ohms for high impedance. The tone...
  14. Replies
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    Sticky: Singer15, High impedance pickup tone...

    Singer15,

    High impedance pickup tone capacitors range from about .02 to .1 uF (micro-farad). This would put a low impedance pickup tone capacitor in the 2 to 10 uF range.

    Just alligator clip...
  15. Replies
    434
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    115,895

    Sticky: Singer15, As the low impedance pickup impedance...

    Singer15,
    As the low impedance pickup impedance is about 10 times lower than the high impedance pickup values, the capacitor values on low impedance circuits, such as yours, should be about 100...
  16. Replies
    434
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    115,895

    Sticky: Singer15, The rule of thumb to minimize...

    Singer15,

    The rule of thumb to minimize loading on a pickup is to use a pot value about 40 to 50 times higher resistance than the pickup resistance. If you look at most high impedance single coil...
  17. Replies
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    Sticky: Diego, Try this low current Kemet Current...

    Diego,

    Try this low current Kemet Current Transformer. https://content.kemet.com/datasheets/KEM_SE0203_CT.pdf

    The most important task is to make a very low resistance connection by fitting the...
  18. Replies
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    Sticky: Big Teee and other forum members, I have been...

    Big Teee and other forum members,

    I have been sharing my private research using current based guitar pickups for a few simple reasons. (1) easy construction (2) less electric guitar typical sound...
  19. See this link for the schematic....

    See this link for the schematic. http://archive.gibson.com/Files/schematics/LPRecording.PDF All the tone changes are on the low impedance side of the transformer. Use a selector switch per the...
  20. The Shure A95U series mic matching transformer is...

    The Shure A95U series mic matching transformer is still available. Look it up on line. It uses an XLR connector for input and a quarter inch plug for output directly into the amp.

    To convert your...
  21. Replies
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    When the input to the pot, coming from the...

    When the input to the pot, coming from the pickup, goes to the center lug and the output from the pot is taken from an outer pot lug this pot is setup to be a blend pot. The volume of each pickup can...
  22. Replies
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    Sticky: Possum, If you look up the Les Paul Recording...

    Possum,

    If you look up the Les Paul Recording Guitar schematic you will see that the output of the low impedance pickups are directly feeding a 2.5K ohm volume pot and an internal transformer to...
  23. Replies
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    Sticky: Diego, and all interested Here are some...

    Diego, and all interested

    Here are some things to consider when making these types of pickups.

    The output impedance of the current transformer (CT) will be, at minimum, the DCR of the string...
  24. The center tap of the 600 ohm impedance is...

    The center tap of the 600 ohm impedance is actually rated at 150 ohms for calculating the turns ratio.

    I am glad I was able to help you.

    Joseph J. Rogowski
  25. I just returned from my vacation. Here are the...

    I just returned from my vacation.

    Here are the rules of thumb to make low impedance pickups.

    AWG42, typical of high impedance pickups, would need to be thicker for low impedance pickups to...
  26. Replies
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    Look up the name George Beauchamp on the web for...

    Look up the name George Beauchamp on the web for his patent applied for in 1934 and given in 1937.
    See this link below for a good historical summary.
    ...
  27. Replies
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    To get the full range from your simulator make...

    To get the full range from your simulator make sure that you are not loading your high impedance pickup into too low of an amp input impedance. The best way is to use a low gain amplifier with a high...
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    On this MEF post I described how I used six...

    On this MEF post I described how I used six transformers to treat each string as an independent moving coil transducer....
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