Connect with us

GUITAR BUFFER/PREAMP

Discussion in 'Electronic Design' started by RealInfo, Apr 12, 2013.

Scroll to continue with content
  1. RealInfo

    RealInfo Guest

    Hi all
    I hope I in the proper forum .

    I want to build a similar preamp like this one :

    http://www.caesound.net/cb2.aspx

    Can you offer a relevant similar schematic as such ?

    Elico
     
  2. hamilton

    hamilton Guest

    Try to google mc4558.

    or

    mc4558 guitar amp
     
  3. Robert Macy

    Robert Macy Guest

    You will find out that for really hard strums a single 9Vdc battery
    supply is NOT enough! Either use two, or add a DC-DC converter stage.

    With the preamp right at the guitar, you'll miss the 'peaky'
    resonances some guitar players like. But, you could probably add a
    switch in cap to duplicate the ong run cable capacitance

    From designing guitar preamps around 30 years ago, TI makes a great
    preamp chip very linear, 3-4nV/rtHz input noise and can run off +/-
    9Vdc batteries. They probably make much better chips now. Don't be
    misled in your search just because an amp can go rail to rail doesn't
    mean that it's working very well when it does that. I've usually had
    to stay over 2.7+ V away from each rail to keep distortion below 1%.

    Inspection of your link shows an EXTREMELY simple amp, you could
    pretty much copy it if you wanted to.
     
  4. OldeGuye

    OldeGuye Guest

    RealInfo used his keyboard to write :
    check out ramseyelectronics.com for amplifier kits. easier way to go.
     
  5. Sure but opamps are amazing these days.
    That might make them not so good for guitar amps though;
    is clipping a good or bad thing?

    George H.
     
  6. Phil Allison

    Phil Allison Guest

    "Robert Macy"

    You will find out that for really hard strums a single 9Vdc battery
    supply is NOT enough!


    ** What utter bollocks !!

    Pre-amps with 9V supplies are used in a great many guitars and are 100%
    FINE.

    This sort of alarmist bullshit is NOT welcome here - pal.




    ..... Phil
     
  7. Guest

    Look at Ebay item number 300852388218 There is not a lot
    of information at the web page you listed. My thought is that it is
    priced way higher than the cost of manufacturing and they do not want
    you to be able to check the specs against other preamps.


    Dan
     
  8. Phil Allison

    Phil Allison Guest

    Look at Ebay item number 300852388218

    ** Why?

    It is a completely different thing.


    .... Phil
     
  9. Phil Allison

    Phil Allison Guest

    Enough for what? What are you running this guitar cord into? Pretty much
    anything you plug an electric guitar into will clip before your 9V-powered
    buffer does. Note the classic Fender input stage clips at +- 2 or 3 V, and
    nobody would say that a Fender Twin isn't a 'clean' amp.

    ** A tube Fender begins to clip at +/- 1.5 volts the input.

    Anyhow, the buffer in question is intended to go AFTER the instrument's tone
    and volume pots, so there will never be any overload in practice.



    ..... Phil
     
  10. Guest

    I am not a guitar player, so I missed the word acoustic. I thought
    the Ebay item was a guitar preamp plus a 5 band equalizer

    But the original poster ought to look at Ebay to find either pcb
    boards or assembled preamps.

    Dan
     
  11. Phil Allison

    Phil Allison Guest

    I am not a guitar player, so I missed the word acoustic. I thought
    the Ebay item was a guitar preamp plus a 5 band equalizer


    ** The Ebay item is a conversion kit for an acoustic guitar to make it
    "electric ".

    The various boxes go INSIDE the guitar - so you need plenty of room.

    The OPs little unit is fitted into a solid body guitar by carving a cavity
    in the back - if the ones already there are not big enough.


    But the original poster ought to look at Ebay to find either pcb
    boards or assembled preamps.

    ** It's bad manners to tell someone to go look in some place - when YOU have
    not bothered to do so.



    .... Phil
     
  12. Guest

    I agree. I did look but found so many possible candidates that I
    though the OP ought to look. I might suggest a preamp that is too big
    or miss some other unstated requirement.


    Dan
     
  13. amdx

    amdx Guest

    The little bit I looked at tells me there is a high frequency loss
    when cabling is added between guitar and amp, also a tonal change when
    adjusting the volume from bigh to low on the guitar. So adding the
    preamp can decrease these affects, but the preamp must be put in the
    proper position in the chain depending on what you want to achieve.


    I found a pdf manuual for the CB-2, but no schematic and as you see
    they scratch out the IC number.
    $125 is way more than the cost to produce and market this device.
    http://www.caesound.com/cb2_spec_7.pdf

    Here is a different preamp. Cost is a little better at $47.
    http://www.musiciansfriend.com/accessories/emg-pa2-preamp-booster-switch?src=3WWRWXGP

    http://www.creationaudiolabs.com/redeemer $49
    If it were my money, I'd try this one.

    Here's a Velleman guitar preamp kit, $29.
    http://www.amazon.com/Velleman-Guitar-Preamp-Kit/dp/B000TA583U

    http://www.guitar-repairs.co.uk/jfet_guitar_preamp.htm

    http://www.amazon.com/Velleman-Guit...qid=1365947433&sr=8-31&keywords=guitar+preamp

    If you really feel the burn to build a preamp, here are a few circuits.

    http://www.till.com/articles/GuitarPreamp/

    http://i13.photobucket.com/albums/a300/mr_sevs/Actgit-pre-pcb.jpg

    A bunch of kits here.
    http://www.generalguitargadgets.com/home

    Some education.
    http://buildyourguitar.com/resources/lemme/

    Mikek
     
  14. josephkk

    josephkk Guest

    Hey, there is a lot of effort in doing blindered, dumb and drunk testing.

    ?;-P)
     
  15. josephkk

    josephkk Guest

    It pretends.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-