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wiring pick-up/piezo/preamp

Posted by Honsik on March 1, 2012 at 3:39pm in Performances, How to Play, Lessons, Concerts

My plans are getting bigger. Wanna make a CBG with external preamp and use a pick-up and a rod piezo.

So it wil be: piezo rod/cable/2,5 mm jack/preamp in/preamp out/2,5 to 1/4 adapter/cable to amp.

Also: pick-up/cables to vol and tone pots/cable/1/4 jack.

Will this work? Do I have  2 cables to the amp or is there a better wiring possible?

Second I want to put the piezo rod under the saddle or in the bridge. Should it be tight fitted or lose and with how much tolerance? And do I fill it with silicone or glue?

So far I thanks for all the help I got so far from all the people here. Tomorrow I go buy me the wood for the neck. I'll keep you all updated with the progress of my first CBG.

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Replies

  • The Phrygian Kid April 12, 2012 at 6:51am
    It's the switch terminals for the switching jack. You may only be able to find dpdt switching jacks, that's fine obviously but you only need one throw for this application. You can use a trs jack in the other output to short the battery to preamp and LEDs, so disconnecting from that one saves battery.
  • The Phrygian Kid March 2, 2012 at 9:14am

    well this is how i would do it.

    note the TRS (stereo) jacks.

    the advantage of doing it this way is that when you use a regular guitar cable the piezo is shunted to ground and you never hear it.

    ie, lets say you put this circuit in two guitars, but only build one preamp tin, and your friend comes over to jam.  He plugs one of your axes into a guitar amp, well he only has the mag pup, you need a stereo cable to use both pickups

    305789167?profile=RESIZE_1024x1024

    • Honsik > The Phrygian Kid March 2, 2012 at 11:07am

      Nice diagram.I wander is there a way to make a 3 way switch in the tin? I than can get 1 cord going into my amp and switch between piezo/mag/both? Or am I asking to much?

       

      • The Phrygian Kid > Honsik March 2, 2012 at 3:50pm

        problem with a 3 way on the tin is bending over to set it.

        consider stomp switches.  ive seen dp3t ones on ebay at 3 for $10.  one of the other throws can light up a led, you can probably piggy back power for those from the preamps battery

        replacing the piezos output jack with a switching jack enables you to sum the outputs when you dont put a cable in that connector

        305789292?profile=RESIZE_1024x1024

        • Honsik > The Phrygian Kid April 11, 2012 at 1:16pm

          What's the little item just above the dpst switching jack?? And how does a dpst looks like?

  • The Phrygian Kid March 2, 2012 at 12:53am
    By 'external preamp' you mean u wanna keep the preamp outside the box so you can use it on multiple guitars?
    There's a smarter circuit. I'll draw it out for you tonight
    • Honsik > The Phrygian Kid March 2, 2012 at 5:04am

      Yes I want to make a little box where I'll fit in the little preamp.So I can later use it on different guitars.Going to use a preamp/equilizer used in western semi acoustic guitars. Is this a good idea?

      • Bob Lumpkin > Honsik April 11, 2012 at 3:58pm

        I have a pic of what you want on here somewhere but I don't know how to make it show up here. "PreAmp In A Can" picture # SDC10910. Sold it, so I'm working on "PreAmp In A Box" between other projects. It really is better than trying to stuff a preamp in a CBG. You can check it out on my page, I think.

      • The Phrygian Kid > Honsik March 2, 2012 at 5:50am
        It sure is. You don't need to open your guitar to change the battery out and it'll save you money on preamps and batteries. Id reccomend a steel container like a small cookie tin so it's fully shielded
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