Every now and again the digital design engineer has to completely leave his (or her) comfort zone and enter the occult of analog design engineers. It is in this world that digital design engineers, used to making yes or no binary decisions, are presented with a multiple of answers all of which, or none, may be correct. It is in this blurry and murky world that any type of help, to corroborate a design, is most welcome.
As part of designing a servo controller board for the 17 DOF Robot (Using FPGAs) Project I had to enter such a world. However, rather than approach the design with Wigi (Ouija) board to hand, to confirm my results, I simulated the circuit design using the electronic equivalent or a Software Program with Integrated Circuit Emphasis, otherwise known as SPICE. The installation of LTspice IV on Mac OS X (Yosemite 10.10) is the subject of this blog post.