Analog systems use continuously varying signals to represent data. In the context of magnetic fields, this means that an analog system may produce a magnetic field that smoothly varies in strength or direction in response to an analog input signal. For example, in an analog audio system, a varying electrical current is amplified and sent through a coil, generating a corresponding magnetic field that drives a speaker cone to produce sound.
In a Solid State System – a microprocessor is used to generate low-voltage pulses that pass through a coil and generate a magnetic field. The microprocessor is programmed with various settings and presets, allowing the user to select the desired pulse intensity and frequency. Digital machines such as the Equispoke PEMF Therapy System, are quieter, more precise, and more user-friendly than spark chamber machines. They also have a more consistent and stable output.