Re: Shotgun microphones

On Thu, 26 Jan 2006 11:49:47 +0000, poppy.uk@xxxxxxxxxxxxxxxxxxxxxxxx
(Adrian Tuddenham) wrote:

>Don Pearce <donald@xxxxxxxxxxxxx> wrote:
>
>> On Thu, 26 Jan 2006 08:33:52 +0000, poppy.uk@xxxxxxxxxxxxxxxxxxxxxxxx
>> (Adrian Tuddenham) wrote:
>>
>> >Richard Crowley <richard.7.crowley@xxxxxxxxx> wrote:
>> >
>> >> "Adrian Tuddenham" wrote ...
>> >> > GregS wrote:
>> >> >
>> >> >> This helix has little directional properties. This
>> >> >> mic amplifies sound by resonating to overcome tape
>> >> >> and preamp noise.
>> >> >
>> >> > Resonance is not the same thing as amplification.
>> >> >
>> >> > Resonance may increse the energy transfer by reducing the impedance
>> >> > mismatch, amplification uses an external supply of energy to increase
>> >> > the power of a signal.
>> >>
>> >> They have found it pretty handy for radio reception for several decades.
>> >
>> >Tuning (resonance) is not the same thing as amplification.
>> >
>> >The power coming out of a tuned circuit cannot be greater than the power
>> >put into it.
>>
>> I can - briefly. It is the energy coming out that can't exceed that
>> going in.
>
>Quite correct - but I was trying to sort out the confusion between
>amplification and resonance, which catches out so many people.
>
>There is a similar confusion between voltage step-up in a transformer
>and voltage step-up in an amplifier ...but don't let's start that
>again.

I remember the thread with some considerable pain.

d

Pearce Consulting
http://www.pearce.uk.com
.

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