can anyone try and verify/help?

[bonkdav]

i came across this little guy and im building it but i have no guitar or pedals to test it with right now so i was just wondering if anyone knew if this sucker actually works since it says unverfied. it looks iffy since the in jack's sleeve isnt grounded but im just goin on guesses here maybe its all good and proper. any light shedding would be loved.


http://www.aronnelson.com/gallery/v/BarcodeVeroLayouts/album120/MiniBlenderPCBLayout.gif.html

Thanks,

davis.

[PerroGrande]

Hi Davis,

The circuit itself is just a JFet Source Follower, which will present a high impedance to your guitar or whatever you plug into it. 

You're right -- there are some grounds that aren't shown on the layout/wiring, which will obviously need to be there.  Otherwise, the circuit and the layout look okay upon initial inspection. 

A couple of caveats. 

If your effect loads the input of your guitar (intentionally or otherwise), it will continue to do so.  Also -- if this occurs, the "clean" signal that you blend with the effect will also show the effects of any loading (e.g. sucking tone).  This circuit doesn't buffer both signals.

It could easily be modified to do so, however, if this is something that you need. 

[bonkdav]

im a bass player so i was thinking about dropping this in with some of my pedals and maybe even rig up some sort of bypassing in case i dont want it there all the time.  im not sure how much tone sucking there is with bass.  I think there was a buffered version in the gallery that i may have to build instead. ill try this one and see how it goes but im guessing i may have to go with the other.  Thanks for the heads up on the loading issue, i was thinking about building a bunch of these and now im glad i didnt.  Im pretty new to this so im not exactly sure if the buffer is what i need though... any more thoughts will be greatly appreciated. 

Davis

[PerroGrande]

If you find signal loading to be a problem (and you probably won't if you haven't experienced it already), you could always just split the line from the "Out" solder pad instead of splitting the input.  That would send buffered signal to both the effect and the blend potentiometer. 

If your bass has active pickups, loading is far more unlikely than with passive pickups -- it already has an active stage which is likely to have a fairly low output impedance (e.g. able to drive just about any pedal without tone loss).

I'd suggest slapping this thing together on a breadboard or vero and trying it out as-is before making any mods.