[help] Phase 45 problem!

[HeaD]

hi. I have built a Phase 45 from tonepad.com schematics: http://img225.echo.cx/img225/8839/pez3zn.jpg . Unfortunately it does not work. in output (b point), there are 0 V, and in the a point there are 3 v. I have tried to replace the cap but it does'nt work equally!

what could it be?!

thanks!  :wink:

[petemoore]

This should help 'What to do when it doesn't work', it is among the top posts.

[HeaD]

it almost works now. transistors and Ics seems to work fine, and regulating the trim pot the sound changes... but the sound in exit does not swing.

I dont understand why... what could it be due to?

[petemoore]

the phaze 45 requires that the Jfet's be matched, and there's a recent posts about the 45, including transistor #'s and odds thereof of getting matched pairs from batches.
 I turned the speed pot most all the way up [least resistance], plugged in Jfet placement interviewees [tried different transistors, two at a time froma matched set of 6], then slowly tweeked the trimpot around the 1/2 way mark until sweep was heard...actually I had to connect pin 5 too  :oops:

[Paul Marossy]

What kind of JFETs did you use? Also, as pete says, they need to be matched.