High Input Impedance Single Supply Amp ?
in [Design]
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From: Phil Allison on 13 Jun 2010 20:38 "Jan Panteltje" > > First frequency characteristic, > a resistive terminated 300 ohm inductor (say 'generator') behaves > different from a open generator. ** Dynamic mics are not inductive sources. The impedance is virtually the same as the resistance of the wire making up the voice coil. ( One exception is "dual element" mics that have two transducers and a crossover network internally ) > The loading of the membrane: > If you load the thing with any impedance, then you sort of put the brakes > on the movement of the membrane. ** Bollocks !! Diaphragm motion damping is all mechanical. Snip rest of this poon's diabolical verbal diarrhoea. ..... Phil
From: Jan Panteltje on 14 Jun 2010 05:37 On a sunny day (Mon, 14 Jun 2010 10:38:10 +1000) it happened "Phil Allison" <phil_a(a)tpg.com.au> wrote in <87lbvsFkcU1(a)mid.individual.net>: > >"Jan Panteltje" > >> >> First frequency characteristic, >> a resistive terminated 300 ohm inductor (say 'generator') behaves >> different from a open generator. > >** Dynamic mics are not inductive sources. > >The impedance is virtually the same as the resistance of the wire making up >the voice coil. > >( One exception is "dual element" mics that have two transducers and a >crossover network internally ) > > >> The loading of the membrane: >> If you load the thing with any impedance, then you sort of put the brakes >> on the movement of the membrane. > >** Bollocks !! > >Diaphragm motion damping is all mechanical. Strange, on your planet physics works differently it seems. > > Snip rest of this poon's diabolical verbal diarrhoea. > > >.... Phil $BAD SYNTAX ABORT RETRY IGNORE
From: Phil Allison on 14 Jun 2010 08:24 "Jan Panteltje = Poon " > First frequency characteristic, > a resistive terminated 300 ohm inductor (say 'generator') behaves > different from a open generator. ** Dynamic mics are not inductive sources. The impedance is virtually the same as the resistance of the wire making up the voice coil. ( One exception is "dual element" mics that have two transducers and a crossover network internally ) > The loading of the membrane: > If you load the thing with any impedance, then you sort of put the brakes > on the movement of the membrane. ** Bollocks !! Diaphragm motion damping is all mechanical. Snip rest of this poon's diabolical verbal diarrhoea. ..... Phil
From: Jan Panteltje on 14 Jun 2010 09:46 On a sunny day (Mon, 14 Jun 2010 22:24:29 +1000) it happened "Phil Allison" <phil_a(a)tpg.com.au> wrote in <hv5727$8cj$1(a)news-01.bur.connect.com.au>: ABORT, RETRY, IGNORE ^ >> First frequency characteristic, >> a resistive terminated 300 ohm inductor (say 'generator') behaves >> different from a open generator. > Phil AllesWrong randomly pressed some keys: >** Dynamic mics are not inductive sources. Yo ushould see all this in teh context of J.Lurking's remork tha the wanted to see wa thread abiout dynamic mikes. His mentioning of thousands of FTES i nparallel to lower the noise suggest we need to look at the smallest details. And theen there is inductance in any wound coild. You could (OK I could) model it in spice even. >The impedance is virtually the same as the resistance of the wire making up >the voice coil. Almost is not good enough when you are usin g2500 FETS in parallel, audio philes are unforgiving. >( One exception is "dual element" mics that have two transducers and a >crossover network internally ) > > >> The loading of the membrane: >> If you load the thing with any impedance, then you sort of put the brakes >> on the movement of the membrane. > >** Bollocks !! > >Diaphragm motion damping is all mechanical. No it is not. > I have verbal diarrhoea. Sorry to hear that, drinking less oil may help I suppose. > >.... Phil > > > > > > >
From: Phil Allison on 14 Jun 2010 10:00
"Jan Panteltje = Psychopath " ** Dynamic mics are not inductive sources. The impedance is virtually the same as the resistance of the wire making up the voice coil. ( One exception is "dual element" mics that have two transducers and a crossover network internally ) Diaphragm motion damping is all mechanical. Snip rest of this poon's verbal diarrhoea. Wot a sad little autistic. ..... Phil |