Abstract: A lightweight inductive apparatus is integrated into at least one therapeutic device (Step 101). Miniaturized circuitry containing logic for a mathematical model having at least one waveform parameter used to configure at least one waveform to be coupled to a target pathway structure such as molecules, cells, tissues, and organs, is attached to the coil by at least one wire (Step 102). The configured waveform satisfies a SNR or Power SNR model so that for a given and known target pathway structure it is possible to choose at least one waveform parameter so that a waveform is detectable in the target pathway structure above its background activity (Step 103). A repetitive electromagnetic signal can be generated for example inductively, from said configured at least one waveform (Step 104). The electromagnetic signal is coupled to a target pathway structure by output of the inductive apparatus (Step 105).