Technical questions:

[Shawn Sutherland]

1 - What is the best capacitor value for audio frequencies running above
100v? (5-10mf)

2 - Can other values can be used with inexpensive standard capacitors for
voltages between 400 - 600 volts to achieve the same result?

Please let me know.

Shawn

 

[Richard Crowley]

"Shawn Sutherland" wrote...

1 - What is the best capacitor value for audio frequencies
running above100v? (5-10mf)

Insufficient information. Need to know at least impedances, etc.

2 - Can other values can be used with inexpensive standard capacitors
for voltages between 400 - 600 volts to achieve the same result?

Insufficient information. Can you reveal more details? schematic?

 

[Myron Samila]

Hi Shawn,

I live and breathe audio, but I can't figure out your question.

Audio frequencies above 100V, do you mean frequencies above 100hz? in which case, a
5-10mF capacitor will not do what you want it to (meaning, you are trying to filter low
frequencies, high pass). I seriously doubt there are many amplifiers that put over 100V
to the speaker load, other than professional power amplifiers, that come close in stereo
mode, and certainly do when bridged. I always laugh at these "home" amps that claim
500W/ch, yeah, ok. I have a Bryston 3B, 100W/ch, it will smoke just about anything from
Pioneer/Technics and all those others.

Basically, let us know what your application is, what you want to do exactly, and I'm sure
your question can be answered.

You would need a 200mF capacitor to filter 100hz and below (high pass) for an 8ohm load
with a 6db/octave slope. To increase the slope to 12db/octave, you'd need a coil as well.

You would need a 400mF capacitor to filter 100hz and below (high pass) for a 4 ohm load
with a 6db/octave slope.

Both situtations require bi-polar caps (non-polarized), electrolytics are easily found in
this high value, but "color" the sound. Poly caps sound better, but are expensive in this
large of a value, also, they are large in size. Voltage in Poly caps are usually in
hundreds of volts, typically, 400V/600V. Typically, a 100V electrolytic will be more than
enough, realize that the voltage produced by the amplifier is in short bursts, and vary
with frequency and load. Typically, in a 12db/octave crossover network or higher,
capacitor voltage won't be as critical on the high pass at higher frequencies because
there is not much voltage at those frequencies. ie: a typical professional speaker can
have a 600W low frequency driver, and a 35W high frequency compression driver crossed over
at 1khz.


Happy New Year.


--
Myron Samila
Toronto, ON Canada
Samila Racing
http://204.101.251.229/myronx19


"Shawn Sutherland" <shawn.sutherland@sympatico.ca> wrote in message
news:%BYIb.11354$Vl6.2535996@news20.bellglobal.com...

1 - What is the best capacitor value for audio frequencies running above
100v? (5-10mf)

2 - Can other values can be used with inexpensive standard capacitors for
voltages between 400 - 600 volts to achieve the same result?

Please let me know.

Shawn

 

[JeffM]

Please let me know.
Shawn Sutherland

Posting the same question individually to multiple groups

is not only foolish (worse than linked cross-posting), it is selfish.

Those people who do not visit each of the groups
will not benefit by the intelligence of the responses at those other groups.

(This assumes that the initial question
was stated well enough to draw meaningful replies.)

 

[GWG]

Now now, no need to be rough on the guy. Not everyone is as well educated in usenet rules
and regulations as you are.

It would have taken just as much effort to answer his question as vague as it is, than to
slam him.

I only visit this newsgroup for electronics, what was your point again?


"JeffM" <jeffm_@email.com> wrote in message
news:f8b945bc.0401011609.7bd2212d@posting.google.com...

Please let me know.
Shawn Sutherland

Posting the same question individually to multiple groups
is not only foolish (worse than linked cross-posting), it is selfish.

Those people who do not visit each of the groups
will not benefit by the intelligence of the responses at those other groups.

(This assumes that the initial question
was stated well enough to draw meaningful replies.)

 

[JeffM]

It would have taken just as much effort to answer his question
as vague as it is, than to slam him.
GWG

I did answer his question--in another group.
This (s.e.m) was the 3rd group in which I encountered it.
Had he cross-posted (or posted it in only one group)
you could have easily read my response.
EXACTLY MY POINT.

 

[GWG]

Point well taken,

so if he did cross post it, and you responded to that cross post, it very well would have
appeared in this ng.

excellent.

"JeffM" <jeffm_@email.com> wrote in message
news:f8b945bc.0401040154.2d033f7b@posting.google.com...

It would have taken just as much effort to answer his question
as vague as it is, than to slam him.
GWG

I did answer his question--in another group.
This (s.e.m) was the 3rd group in which I encountered it.
Had he cross-posted (or posted it in only one group)
you could have easily read my response.
EXACTLY MY POINT.

 

[Michael Black]

JeffM (jeffm_@email.com) writes:

It would have taken just as much effort to answer his question
as vague as it is, than to slam him.
GWG

I did answer his question--in another group.
This (s.e.m) was the 3rd group in which I encountered it.
Had he cross-posted (or posted it in only one group)
you could have easily read my response.
EXACTLY MY POINT.

And then when he posted his revised question, based on all the comments
in at least three newsgroups telling him he wasn't asking proper questions,
he posted the revised question to multiple newsgroups, but once again one
at a time.

And I know I did comment on the matter of multiple posts after the first
question. Though, I actually emailed the comment because when people spew
across newsgroups like this, who knows whether they are bothering to
read the various newsgroups so I couldn't decide which newsgroup to
respond to. So I emailed him telling him it was not the proper way to
do it.

Michael