Hey fellas, sorry to bother but I am curious about something and the internet has thus far not provided me with answers or I did not recognize them when I saw them. I am a midwit technician who tinkers with electronics and the problem relates to a project of mine.
The issue is this: I have a relatively low impedance AC circuit which must be routed through a mostly high impedance audio circuit. In this rather common situation there is the issue of noise being inducted into the sensitive, high impedance audio circuit from the low impedance circuit. What I would like to know is a) the proportional relationship of the low impedance current to the induced voltage and b) the proportional relationship between the distance between the conductors and the induced voltage.
Regarding the first, I understand that a lower current will produce a weaker magnetic field but how effective is reducing current at minimizing induced hum? Will halving the current halve the induced hum, all other things being equal, or is there some more extreme relationship? I can run the high impedance circuit at either 12.6V@450mA or 6.3V@900mA and I would like to know what sort of advantage I might gain from this.
Regarding the second query I have read on forums but never seen any equations that indicate it that the strength of the magnetic field will fall away by the inverse square. Is this true? Is doubling the distance way more effective than halving the current?
If some one could provide the relevant equations or point me in the correct direction that may be sufficient, but I have read the wiki about Faraday's law and various discussions on stack exchange and could not muster that information to my advantage. I thank you for you time and consideration in advance.
The issue is this: I have a relatively low impedance AC circuit which must be routed through a mostly high impedance audio circuit. In this rather common situation there is the issue of noise being inducted into the sensitive, high impedance audio circuit from the low impedance circuit. What I would like to know is a) the proportional relationship of the low impedance current to the induced voltage and b) the proportional relationship between the distance between the conductors and the induced voltage.
Regarding the first, I understand that a lower current will produce a weaker magnetic field but how effective is reducing current at minimizing induced hum? Will halving the current halve the induced hum, all other things being equal, or is there some more extreme relationship? I can run the high impedance circuit at either 12.6V@450mA or 6.3V@900mA and I would like to know what sort of advantage I might gain from this.
Regarding the second query I have read on forums but never seen any equations that indicate it that the strength of the magnetic field will fall away by the inverse square. Is this true? Is doubling the distance way more effective than halving the current?
If some one could provide the relevant equations or point me in the correct direction that may be sufficient, but I have read the wiki about Faraday's law and various discussions on stack exchange and could not muster that information to my advantage. I thank you for you time and consideration in advance.
