Circuit Modeling

Circuit modeling programs offer a number of advantages over a pen and paper when it comes to designing new guitar circuits.  For one thing, you can actually test out your creation before you go to the trouble of wiring it together.  Perhaps the most frustrating stage for any of us is trouble-shooting things if they don't work out.  It is sometimes impossible to know whether the problem is in your design or your workmanship in bringing that design to its completion.


Personally, I recommend MultiSIM as a great circuit modeling program.  One of my favorite features is the ability to assign "hot keys" to switches in the circuit.  These can then be controlled in real time from your keyboard to toggle options when testing the circuit to ensure it works as you had intended.

The following circuits are in MultiSIM.  I am not an expert on programs like this, but it is based on PSPICE, so I would imagine these files might work on other, similar circuit modeling software packages.  Let me know if you have any success with these on other programs, and I'll share that info.


Notes about modeled circuits
Note that in these models I set the output of the two (or more) "pickups" to different levels.  To me, this makes it easy to see whether they are summed (i.e., connected in series) or if you're getting the reciprocal of the sum of their reciprocals (i.e., connecting them in parallel).  You can also see if you're getting phase cancellation if they drop.  If both "pickups" had the same output level, then reversing the phase of one would result in 100% cancellation or zero output, and this would be indistinguishable from a switching combination that simply grounded out the signal entirely.

In all of these circuits, the pickups are modeled using a voltage source, an inductor, and a resistor.  These are not intended as actual models of any real-world brand of guitar pickups (although the values of the individual components are, in fact, reasonable approximations of the equivalent elements of the pickup), merely as sources of sine wave signals to run through the circuitry.

The output is run to an oscilloscope so you can measure the levels to see if they are what you expect.


STILL UNDER CONSTRUCTION.  SORRY; THIS PAGE WASN'T MEANT TO BE UPLOADED YET.
Sample circuits.
les-paul-modded.ms8
magical-idea.ms8
raw-components.ms8
series-humbucker.ms8
series-paralel-humbucker.ms8
three-way-switch.ms8
two-pickups-phase-switch.ms8


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