boost or cut circuit in guitar

Discussion in 'Luthier's Guitar & Bass Technical Discussion' started by phild, Sep 21, 2008.

  1. phild

    phild Member

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    I have an LP that I want to go to a single master volume and change the other volume over to a boost switch (or knob so i looks the same), for solos, (I'm already down to a master tone control and a variable split control for the other two). I think a boost circuit would require some power - ie battery, though a cut of a few decibels would accomplish the same task and could be passive, but a boost would maybe hit the amp a bit harder which would be nice. Does anyone know of some simple circuits that would fit in an LP control cavity and accomplish either a boost or cut?

    Thanks,
    Phil
     
  2. walterw

    walterw Gold Supporting Member

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    there are plenty of boost options, all of which require a battery and many of which change the non-boosted tone, mostly by making the guitar an "active" instrument.

    you already have a cut device, it's called the volume knob.
     
  3. phild

    phild Member

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    Yeah except the volume is a variable cut - and I think I would rather build a few boost circuits to try out anyway as changing the tone is not always a bad thing. If any one knows of any diagrams available online I would appreciate any help.
     
  4. pula58

    pula58 Silver Supporting Member

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    villex makes a passive booster
     
  5. walterw

    walterw Gold Supporting Member

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    the laws of physics say that there is no such thing.

    i think the villex does some kind of e.q. trick that focuses the available energy in a narrow area, maybe giving more drive in a certain midrange band while chopping off the bass and treble.
     
  6. FuzzyAce

    FuzzyAce Member

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  7. phild

    phild Member

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  8. pula58

    pula58 Silver Supporting Member

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    true, there is no overall energy increase in a passive circuit, so, the energy gets narrowed in frequency and becomes louder within the narrower frequency range. I have a Villex booster in my Tom Anderson Classic (Strat) and it is nice for a slight fattening-up for leads and thickening the neck pickup sounds for rhythm.
     
  9. stan p

    stan p Member

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    Unless he is using the energy that is dissipated without any use .. that may be the magnetic field created by the pickups?
     
  10. stan p

    stan p Member

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    Demeter fat boost?
    THis is used in the Tylers I believe.
    There are also preamps by Alembic, Bartolini, and a company run by a guy that designed the original ALembic pramp.
     
  11. stan p

    stan p Member

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    I heard about a design when the boost circuit is built into jack ot the patch cable.
     
  12. phild

    phild Member

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    Has anyone tried any of these onboard boosts? If so, which ones and what's your opinion of it?
     
  13. phild

    phild Member

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    I have decided to build an AMZ mini-booster into my guitar: http://www.muzique.com/amz/mini.htm

    Apparently a lot of boutique pedal builders have "borrowed" this circuit for their own use. More info here:
    http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=69&Itemid=26

    This circuit is small enough that I can make it about the size of a 9 volt battery, which will also be needed to power it. To keep the size down I am going to forgo the use of a circuit board. Then I will wire it to a push pull pot, for on/off and amount of boost and replace one of my volumes with it and just go with a master volume.

    I ordered the parts yesterday (a grand total of $4) and I'll wire it up and try it before installing it to see if it is something I am actually going to like/use.

    I'll let you know how it goes if you're interested.
     
  14. WahmBoomAh

    WahmBoomAh World Crass Guitarist Silver Supporting Member

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  15. testing1two

    testing1two Gold Supporting Member

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  16. Denny

    Denny Member

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    I have an EMG PA2 and it is really good, quiet and easy to install. Uses a 9v battery and the battery life is pretty long too. also uses a switchable jack - everything needed for an install comes with it. I'm now in the process of putting one in almost all of my guitars. Don't need on footswitch anymore!!!! AND - it's adjustable w/ a trimpot. Go for it!!! If you don't like it, I'll take it.

    D.
     
  17. walterw

    walterw Gold Supporting Member

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    there ya go.

    the afterburner is the same circuit built into a push-pull pot, so that the boost level is adjustable on the fly.

    both of these gizmos give the guitar an active low-impedance output even when switched off, so fuzz players may not like them.
     
  18. packermann

    packermann Member

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    I have tried the EMG PA2 as well. You can custom order this with a toggle, push-pull or always on configuration (all with adjustable mini trim pot to adjust the amount of boost). I have to say I ended up going back to a standard passive set up. The low impedance output made my fuzz sound bad and I think the signal added some noise even at unity gain. Although the external pedal is a pain, I think it is the most flexible option.
     
  19. Denny

    Denny Member

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    phild - if you don't like it, I'll buy it as long as it isn't "boogered" LOL
     

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