schematic and prints for akg 451 pad?

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In article <coih99$564$1@news1.chem.utoronto.ca>,
Rob Reedijk <reedijk@hera.med.utoronto.ca> wrote:
>Richard Crowley <rcrowley7@xprt.net> wrote:
>> "Rob Reedijk" wrote ...
>>> I would also think that it is difficult to create these things since
>>> the body is what conducts the ground and it limits the type of pads
>>> that can be designed. And no matter what, you will have trouble with
>>> how the shunt resistor connects to the body in the pad.
>
>> All the pads I've seen are simply a single capacitor in
>> series with the signal path. No connection to the shell.
>
>Like I said, I am not an EE! I have seen Frank Vuotto's web photos of
>the pad which confirms what you said.
>
>But you still have an extra coupling on the ground path. And this ground
>path is a weakness in the design.

Sure, but there are so many other things wrong with it that the issue is
fairly academic.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 

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Archived from groups: rec.audio.pro (More info?)

frank,
thanks so much for the pics. very helpful. any idea what cap value
for approx -20 or -30 db?
also, can you describe the switch? it is spring loaded? is that
really a switch, or is it just something that assures good contact?
thanks
kurt


Frank Vuotto <deepthrob@hotmail.com> wrote in message news:<0d4oq0h7a8apv123dk9p37ak6lqjlar6ak@4ax.com>...
> On Mon, 29 Nov 2004 21:40:01 -0800, "Richard Crowley"
> <rcrowley7@xprt.net> wrote:
> >
> >All the pads I've seen are simply a single capacitor in
> >series with the signal path. No connection to the shell.
> >
>
> As I recently mentioned, I have a 451 with problem threads. Works
> with a pad and not without one. Today I disassembled a -10 db pad and
> disconnect the cap, I took pictures and posted them, linked on the
> bottom of my floobydust page.
>
> http/www7.taosnet.com/f10/floobydust.htm
>
>
> The 75pf clearly goes from the center post to the case.
>
>
> Frank /~ http/newmex.com/f10
> @/

 

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"Scott Dorsey"
>
> Sure, but there are so many other things wrong with it that the issue is
> fairly academic.


** If Dorsey recommends something - then do the exact opposite.




.............. Phil

 

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ok. plans are moving along to fabricate some pads. anyone know how
to dismantle a 451?

 

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Archived from groups: rec.audio.pro (More info?)

"Kurt Ballou"
>
> ok. plans are moving along to fabricate some pads. anyone know how
> to dismantle a 451?


** No need to dismantle it for what you are doing.

Anyhow, IIRC there is a internal clip ring holding the XLR base in place.

Remove it and the whole guts slides out.





................ Phil