
Now this next is NOT aimed at you CC but it is these sort of debates that hiss me off mightily! As an engineer* I am far more concerned about getting clean signals into a system than any airy-fairy nonsense about "tone"!lol...why? just curious and was surfing through hours of SM7 vs SM7A stuff....it was the "change" that's folklore or real?
It got me wondering what and how is a humbucker in a microphone such a big deal? what is it physically that can create decades of
debating whether it was a good idea or ruined the "tone" man....pffffttt...its all the tone deeewwd...hits the bong...
maybe some hear this Humbucker in the circuit and some don't? it seems pretty 50/50.
do you think adding a humbucker in a circuit would make a tone difference in a capsule? based only off adding this in a circuit in theory?
I shall take that as a compliment! That quote is BOLLOCKS! The main hum frequency from a power traff is at the mains frequency. Yes, there will be a bit of 2nd harmonic and if the transformer is working very close to its limit a fair bit of 3rd harmonic i.e. 150Hz for Blighty (and most right thinking countries!)You would have done well with Shure as they weren't really in the "tone biz" but instead engineering for applications.
the level of hum and transformers about.... that kind of helps answer why they added this. Interesting and logical reason they added this into the circuit.
googled
A transformer hum is typically at twice the frequency of the power line, meaning it would be 120 Hz in regions with a 60 Hz power supply and 100 Hz in areas with a 50 Hz power supply
So in this application if the "added Humbucker Coil" purpose is filtering out that Hum, aka low freq level 100~120hz.
So I will assume its probably not going to be degrading a Human Voice freq range.
Seems similar to a HPF. I wonder if a HPF is ON, it will drop off the lower FREQS all the time. Does a Humbucker Coil filter all the time or only when it senses the Hum?
Well, a bit but! Balanced operation is a little more subtle in that yes, you have an amplifier with differential inputs but the noise rejection comes about by the "balance" of the feed and receive impedance.Since the voice coil is behaving like antenna, you give it a twin nearby (which is not capturing any sound) and wire it in with reverse polarity. It's virtually the same idea as balanced connections.
Yes Rob, in PRINCIPLE very simple but making the null effective takes work. The coil (which from that schematic appears to be in series* with the VC) needs to have the right inductance, governed by number of turns and magnetic properties of any materials in or around it. This needs some design finessing since the buck coil cannot be in the same physical place as the coil it is "bucking".You are all overcomplicating this a bit. The key features of humbucking coils have been mentioned but sort of hidden?
A dynamic mic has a magnet. It has a diaphragm with a fine copper coil wound around the edge which waggles in the magnetic field as you make noises into it - the movement is in effect, a generator of electricity. if you add a second coil NOT connected to anything that moves, it generates nothing at all. Now the clever bit is to take the generating coil and put it in parallel with the non generating one, but wired backwards - reverse polarity. Make a noise and sound is converted to voltage and out comes your audio. If you happen to be next to interference producing devices like transformers or other generators of hums and buzzes, the interference enters both coils and cancels out. With just one coil, being next to that big transformer puts a big hum component onto the audio.