Generating EM field

[SteveJanesch]

Hi Mike,

A couple more details would be helpful. What frequency/range of frequencies do you need? Also, what's the expected impedance (resistive and inductive) of the coil - or - what's the max voltage at which you need to deliver your 1 mA? Is that 1 mA peak or RMS? What power source do you think you'll use (batteries or X volt wall wart) and is that included in your 3x3x3 volume?

The reason I'm asking is that a single low frequency with a low voltage could be something as simple as a 555 timer with a filter and maybe an amplifier following it. Large ranges of frequency and or voltage will require something more elaborate.

- Steve