Pt2399 Karaoke circuit adapted for guitar

[Pauld35]

hi,

I'm back working the other $5 kit i bought a few years back making it into another cheap guitar echo. I have drawn the schem out properly and readable this time. Going to implement the delay time control and some capacitor coupling at the input for guitar like before.

Really wanting some help advice on changing the volume control to a wet/dry mix instead if any one has worked with this kind off circuit before? the volume only seems to control the overall level.

Thanks for any advice, hopefully this thread will be useful for anyone on an extreme budget looking for converting budget guitar echo or maybe just to give a better blend to mic the echo from their amp to a second amp.

 

[Pauld35]

Hi,
I have found a schematic to incorporated and will add the new schematic once its tested and drawn up with changes to board for future reference.

 

[29285]

You may have a look at my implementation of PT2399 Echo that I use for some time. There is additional ciruitry with JFETs to switch the wet signal using some footswitch, which can be omitted.

 

[Pauld35]

Thanks, are the second pots used as trimmers? wondering what program do you use to draw your schematics?

 

[29285]

The schematics are drawn with KiCAD, they represent my pcb layout.
There are not trimmers, but 3 pots: delay, echo-volume, echo-feedback.