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Newbie here...question re treble and bass control for speakers

Discussion in 'Electronic Basics' started by elfa, Oct 25, 2003.

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  1. elfa

    elfa Guest

    I'm pulling my hair out trying to come up with a simple circuit that can be
    placed between a speaker and its amplifier to control treble and bass.

    My project is to use a portable, battery powered speaker system (like PC
    speakers or the portable battery powered types), replace the small speaker with
    a larger one, and add treble and bass controls between the two. I've already
    got a 6 volt amplifier (4 C size batteries) attached to a 6 inch speaker (works
    fine). NOW....I want to add a simple treble and bass system between the two.

    I'm hearing impaired and this would help me listen to portable radios a lot
    better.

    any suggestions would be appreciated.

    elfa
     
  2. Lord Garth

    Lord Garth Guest

    http://www.aaroncake.net/circuits/tone.htm
    http://amps.zugster.net/articles/tonestacks/
    http://engineering.rowan.edu/~brow7784/SophClinicII/STSchem.html
     
  3. Byron A Jeff

    Byron A Jeff Guest

    [Message snipped.]

    Please don't multipost by individually posting a single message in multiple
    groups one at a time. Either post to a single newsgroup or crosspost to
    multiple groups with a single message. You have doubled or tripled the
    bandwidth of your messages and scattered your replies by multiposting.

    BAJ
     
  4. elfa

    elfa Guest

    You worry about your bandwidth and I'll worry about mine.

    elfa
     
  5. Rich Grise

    Rich Grise Guest

    Please don't get all offended by a gentle netiquette reminder.
    Crossposting is better, and actually, in answer to your kind
    of snotty response here, we _ARE_ worrying about our bandwidth.
    That's the bandwidth that your crosspost uses.

    Plus, crossposting is better, because whenever anyone responds
    to a crosspost, it appears in all the NGs simultaneously,
    increasing your chances of getting a response, and making
    it easier to catch any responses.

    It's not hard to do; you can string together newsgroup
    names with commas, e.g. sci.electronics.basics,sci.electonics.misc
    and so on.

    Then again, you might prefer to learn the hard way, when
    people conveniently forget to read your posts.

    Good Luck!
    Rich
     
  6. dB

    dB Guest

    Byron A Jeff says...


    Bandwidth?

    Bandwidth is the difference between the highest and lowest frequencies
    which a system can support.

    "You have doubled or tripled the
    bandwidth of your messages ..... by multiposting."

    Bandwidth?
     
  7. I agree that it's better to cross-post than post to a number of
    newsgroups separately. The responses won't be redundant, and
    everyone will be working together rather than separately.

    But, most of the time one can find one newsgroup that is most
    appropriate for a post, and do without any cross- or multiple-posting.
    Cross-posting is usually the mark of someone who can't be bothered to find the
    best newsgroup, someone who doesn't care, or someone so full of themselves
    that they think everyone wants to read their message.

    So it's best to post to a a single newsgroup.

    And only if there is a good reason, then cross-post rather than multiple-post.

    Michael
     
  8. Byron A Jeff

    Byron A Jeff Guest

    I am worried about my bandwith. Actually I'm worring about everyone elses too.
    A crossposted message only gets transmitted and stored in a news server once.
    A multiposted message such as this one gets transmitted and stored on every
    news server that carries those groups multiple times.

    You also missed my point about the damage to yourself. Since different readers
    will get the messages in different orders, you have to scrounge around all of
    the groups that you post in to get all of the replies. By crossposting, all the
    replies will show up in all the groups, therefore making it easier for you
    to collect responses, and even more pointed, allowing a wider group of folks to
    interact.

    There's simply no good reason to multipost. If the message belongs in multiple
    newsgroups, then crosspost it.

    BAJ
     
  9. Byron A Jeff

    Byron A Jeff Guest

    -> Please don't get all offended by a gentle netiquette reminder.
    -> Crossposting is better, and actually, in answer to your kind
    -> of snotty response here, we _ARE_ worrying about our bandwidth.
    -> That's the bandwidth that your crosspost uses.
    ->
    -> Plus, crossposting is better, because whenever anyone responds
    -> to a crosspost, it appears in all the NGs simultaneously,
    -> increasing your chances of getting a response, and making
    -> it easier to catch any responses.
    ->
    -I agree that it's better to cross-post than post to a number of
    -newsgroups separately. The responses won't be redundant, and
    -everyone will be working together rather than separately.
    -
    -But, most of the time one can find one newsgroup that is most
    -appropriate for a post, and do without any cross- or multiple-posting.
    -Cross-posting is usually the mark of someone who can't be bothered to find the
    -best newsgroup, someone who doesn't care, or someone so full of themselves
    -that they think everyone wants to read their message.
    -
    -So it's best to post to a a single newsgroup.
    -
    -And only if there is a good reason, then cross-post rather than multiple-post.

    And let the congregation say amen.

    BAJ
     
  10. Byron A Jeff

    Byron A Jeff Guest

    Yes bandwidth.
    Bandwidth is also a measure of the amount of information that a channel can
    carry which is also partially defined by the difference you allude to above.
    And also it represents the amount of the channel required to carry a message.

    In that context, I'm right on the mark. By duplicating message you take more
    of the channel capacity to carry the duplicates.

    But you already knew that. Right?

    BAJ
     
  11. Lord Garth

    Lord Garth Guest

    We used to tease one guy because he could send morse code using CW so fast
    that we told him he was using more than his allocated bandwidth...40+ wpm
    using a semi-automatic key and 60ish on receive...amazing!
     
  12. elfa

    elfa Guest

    It was multi-posted for the simple fact that I found the second group only AFTER
    I had sent the first post to this group. I just copied and pasted the same
    message to the second post.

    I find it amazing that you're more concerned about my posting style than my
    request for help.

    elfa
     
  13. That's not true. I often find it pays to fish several different groups on
    some topics.
    I've had many cases where a question one group won't draw a single response,
    and yet will draw several in another group. You can't always predict.

    As far as cross posting vs. multiple posting, it really doesn't matter (thou
    gh I always go the multiple post route to avoid the inevitable flame war
    that cross-posting seems to generate).
     
  14. Steve

    Steve Guest

    Jesus Christ guys, we're talking about what… 2kb/post!!?? Crap on a
    stick, who cares about 2 bloody kilobytes!?!?! Meanwhile, there's
    been 10 posts to and from idiots complaining about Elfas postings!
    How much bandwidth did that chew up, eh?! Get over it!!

    Welcome to Usenet, Elfa. People here get uptight about all sorts of
    things, no use trying to appease some of them. Just ignore the people
    that piss you off, that's my best advice. Anywho, notwithstanding
    stupid name-calling spats (…idiot troll post thread) netiquette
    technicalities (top post vs. bottom post) and petty bandwidth
    arguments, here's my response;

    Putting a tone control between and amp and the speakers (if that's
    what you intended to say) is going to prove quite difficult and
    possibly expensive. Lord Garths response contains useful tone
    controls, but none of those will work between the amp and speakers.
    If you are in fact using PC speakers, chances are that it is line
    level coming out of your PC and the amplifier is built into the
    speakers. In that case, inserting a tone control BEFORE the amplifier
    is a viable option.

    Double check what you need and get back to the group, or search
    google.com for a myriad of conventional and simple tone controls.

    nifty
     
  15. elfa

    elfa Guest

    Thanks nifty for the response. Actually, the input will be coming out of the
    earphone jack of a portable radio so there will be a minimum of current.

    As you probably know, there's lots of battery powered amplified speakers
    designed to plug into a portable radios earphone jack. I've already taken apart
    one of them that has 2 speakers (2 1/2 main speaker and 1 3/8 tweeter connected
    with a cap in series). I've replaced the 2 1/2 inch speaker with a 5 1/2 inch
    speaker and the sound is much better for my hearing. All I wanted to do was add
    an the additional ability to adjust bass and treble (or tone control) by putting
    in a passive circuit, either between the amp and speaker (which you say is not
    reasonable) or between the portable radios earphone jack and the input jack of
    the amp.

    I would have tried Lord Garth's baxandall idea but I don't have the 500K ohm
    pots or right caps yet. Would the baxandall idea work between earphone jack and
    amp or isn't there enough current to make it work?

    thanks for the response without the multipost lecture.

    elfa
     
  16. Lord Garth

    Lord Garth Guest

     
  17. Rich Grise

    Rich Grise Guest

    [crosspost restored, and top posted because, of course, my
    response is more important than the question. ;-) ]

    Personally, I think of it as conceptuallly similar to
    "casting a wide net." If there are people who have a
    small subset of favorite groups, there's a (possibly)
    better chance of someone who has an answer will read
    the question. Or at least the header. ;-)

    Shall we start another flame fest? ;-)

    Cheers!
    Rich
     
  18. Rich Grise

    Rich Grise Guest

    Fair enough. :)
    Stick around - you'll meet more ;-)
     
  19. Better check your math! ;-) You have a wrong multiplier in your text.
     
  20. Lord Garth

    Lord Garth Guest

    Where did that "k" go....I found it...it was on my floor!

    Thanks
     
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