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In Reply to: Re: question regarding separate PS and cables posted by mwiebe on February 22, 2007 at 06:22:50:
The idea is that of voltage level, electric field strength, and circuit impedances. Typically, an AC heater string will, by way of induction, inject ac hum into the sensitive (high impedance, low voltage) signal path. Shielding the signal path and/or heater string will normally neutralize this affect.However, here we are dealing with a high voltage, low impedance power supply line, being tickled by a low strength E/M field from your heaters. There is simply insufficient field to produce electron flow in the B+, as the low source impedance of B+ is the dominant player. Most likely, you would not experience any 60Hz inductive pickup from a heater line.
What would be more of an issue would be high AC current, I suspect. Higher currents produce correspondingly stronger magnetic fields. The magnetic fields are more problematic than electric fields, as they can actually permeate an electrostatic shield. But again, looking at source impedance, I find it hard to believe you will pick up any hum.
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- Shouldn't make a difference (hopefully) - KurtP 06:57:35 02/22/07 (0)
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