Adding a Depth Control to a Phase 45

[Mobisimo]

Hey all,

Is it possible to add a depth control to a phase 45 clone.  Heres a link to the schematic and layout at tonepad.  Somebody mentions it in the build reports, but doesn't go into much depth (excuse the awful pun).

Thanks in advance.

http://www.tonepad.com/project.asp?id=13

Also, if anyone has experience with this project, any advice or findings would be much appreciated.

[brett]

Hi.  I built one of these a while ago.  It offers a nice depth of sweep in standard form.  I doubt that you'd find it too deep.  Alternatively, if you want it permanently mild you could choose FETs that aren't well matched.

cheers

[brett]

Looking at the schematic, the dry signal and phased signal are mixed just before the output cap.  The mixing involves 2 parallel 10k resistors.  If you replaced these 2 resistors with a pot, so that dry and phased were connected to lugs 1 and 3, and the output taken from lug 2, you'd have a control where maximum depth would be mid-turn on the pot and minimum depth would be at both max and min turn.  I think a 25k(B) pot should work.

Ask again if that's as clear as mud.

cheers

[Mobisimo]

Thanks for the reply man.  I like the idea with mismatching the jfets, thats some creative thinking.  
As for the pot, I was kinda thinking the same thing without the resistors.
If you say the depth is nice though, thats good enough for me.

Thanks again.

[Gringo]

Check this out:

http://www.lynx.bc.ca/~jc/phase45modded.gif

Good luck!

[Mobisimo]

Thats pretty sweet stuff.  Thanks a lot man.  I'll let you all know how it works out.  Might be a little while...