E.W.S Tri-Logic II Bass Preamp  [traced]

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bluetube
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Post by bluetube »

For those willing to verify the layout. :mrgreen: Here's an updated layout as per a friend's suggestion. :wink: A minor change on a jumper. Paper size is A4. Print without page scaling.
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chicago_mike
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Post by chicago_mike »

I'll test the new version asap. 8)
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OrionManMatt
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Post by OrionManMatt »

I'm back in town from holiday and will have a chance to look your file over on Monday, bluetube.

I guess I could have shipped it to chicago mike while I was gone... in retrospect... :D
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Post by chicago_mike »

Oh don't do that now!!!

I leave for a 3 month long cruise ship gig in a couple weeks! :|
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Post by bluetube »

OrionManMatt wrote:I'm back in town from holiday and will have a chance to look your file over on Monday, bluetube.

I guess I could have shipped it to chicago mike while I was gone... in retrospect... :D
Thanks Matt. Niki filled in some of the blanks. :thumbsup It would be nice if you can go through those four resistors. Me being OC I guess. :lol: No rush bro. :D
chicago_mike wrote:Oh don't do that now!!!

I leave for a 3 month long cruise ship gig in a couple weeks! :|
Mike are you bringing DIY stuff along with you during the cruise? :lol: If inspiration strikes I might just prototype this for confirmation. Either that or I'm going to pester a friend to do it for me. :mrgreen:
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Post by ejbasses »

bluetube wrote:
Mike are you bringing DIY stuff along with you during the cruise? :lol: If inspiration strikes I might just prototype this for confirmation. Either that or I'm going to pester a friend to do it for me. :mrgreen:
:slap:
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bluetube
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Post by bluetube »

ejbasses wrote:
bluetube wrote:
Mike are you bringing DIY stuff along with you during the cruise? :lol: If inspiration strikes I might just prototype this for confirmation. Either that or I'm going to pester a friend to do it for me. :mrgreen:
:slap:
:horsey: :lol: :horsey:
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Post by darmstat »

How did they calculate 10khz for the treble in this E.W.S circuit?
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Post by quaternotetriplet »

do anyone know where i can get center detent pots for this preamp?
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Post by oscarv77 »

chicago_mike wrote:I'll test the new version asap. 8)
Did you ever have a chance to try the new version? I want to start a new project and since I've been playing bass in a band for the past few months, I figured I'd try to build a bass pedal.
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Post by alexradium »

bluetube wrote:For those willing to verify the layout. :mrgreen: Here's an updated layout as per a friend's suggestion. :wink: A minor change on a jumper. Paper size is A4. Print without page scaling.
i am currently testing this project,source resistor of BS170 is 10K,you can see it in the photos,this way you get a buffer.
last parallel resistor on volume should be 270K,i used 220k.
mid shift switch isn't much effective,i'd like to try other solutions.
Final test in the next days with a proper 18V supply,now i'm having problems with an LT1054 doubler.
cheers
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Post by oscarv77 »

Alex, please let me know how it turns out. I'm *this* close to just buying the pedal...
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Post by alexradium »

oscarv77 wrote:Alex, please let me know how it turns out. I'm *this* close to just buying the pedal...
its a good preamp,especially if you play passive bass.
Its not difficult to do,not expensive,sounds good and clean.
My next move will be to try to incorporate a parametric shifting mid control like the BMC,that would make it super versatile.
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Post by chicago_mike »

I have a vari-mid schme from an ibanez bass...should be easy to add to this guy.
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Post by alexradium »

chicago_mike wrote:I have a vari-mid schme from an ibanez bass...should be easy to add to this guy.
i just found that bypassing the 2.4k in series with the mid capacitor (47 or 100n) will give 2 higher band values,similar to those declared for the Xotic basses,i'm going to test this soon.
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Post by chicago_mike »

coolness. :)
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Post by alexradium »

alexradium wrote:
chicago_mike wrote:I have a vari-mid schme from an ibanez bass...should be easy to add to this guy.
i just found that bypassing the 2.4k in series with the mid capacitor (47 or 100n) will give 2 higher band values,similar to those declared for the Xotic basses,i'm going to test this soon.
even more,new version of the Xotic onboard pre has a treble shifting from 6 to 12Khz.
that can be accomplished lowering the treble wiper resistor,there are 2 values in the photos,1k and 1.8k.
i'd go for 1.8k for 6khz and 470r for 12khz.
extra slap!
I will report after further testing with scope.
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chicago_mike
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Post by chicago_mike »

Where di you get the photos? Mt lazy internets search showed zip. :shock:
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Post by alexradium »

chicago_mike wrote:Where di you get the photos? Mt lazy internets search showed zip. :shock:
all i have seen so far is in this thread,then i work out some changes on a simulation before testing.
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OrionManMatt
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Post by OrionManMatt »

I wouldn't mind finding out how to change the lows to 40, highs to 4k. :-)
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