Quote:
Originally Posted by old_tv_nut
You got it. The trap circuit sucks a narrow range of frequencies out of the broader circuit's response.
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And it's the "passive" coil that does this? It does that because the slug and coil are positioned so its natural resonance is at the undesired frequency. When the powered broadband signal goes through the connected coil, the energy associated with the unwanted frequency starts vibrating the tuned passive coil. The energy needed to do this formally resided in the broadband signal at the trap frequency. It is transferred to the trap coil vibrating it and eventually dissipated as heat (Not that it's important...just trying to follow the energy)????????