signal issue

[daz061]

i have built a phase 90 off tonepad. the problem is no signal from the guitar gets through but if i plug in a cable from my ipod i can hear the music fine, this is strange to me. why can the music be heard but the guitar signal wont. ive checked the guitar cable and its fine. any ideas?

[nate77]

Do you get any signal when the effect is bypassed or do you have this breadboarded?

[daz061]

yes signal is fine when effect is off, its breadboarded ye

[GGBB]

why can the music be heard but the guitar signal wont

The iPod signal is probably a lot stronger than the guitar signal.  Do you hear anything at all, however faint?

[daz061]

nothing at all guitar wise

[aron]

When the iPod is plugged in, do you hear phasing?

[daz061]

no cant say it is actually. component problem maybe?

[aron]

Did you check voltages on the circuit? Does tone pad give you test points to check the voltages? It really sounds like there's some sort of power problem.

[daz061]

i could try that, maybe just try each pin on the ic's and transistors. i will try tomorrow and i will post my findings

[GibsonGM]

Using the same cable for the ipod and the guitar?  If the guitar cord was shorted, you'd expect what you have.

[aron]

When you think about it, assuming the parts are in the right place, making sure the pedal has power is next. Then off board wiring etc...
Triple check the orientation of your parts (electrolytics) and make sure that they are oriented correctly.

[daz061]

not the same cable.

What i ran from the ipod was just a 3.5mm to 1/4" jack cable that I had.

Its like the guitar signal is somewhat weak and not getting through so like whats been said it could well be power related

[nate77]

+1  the iPod is powered and it simple sounds like there isn't enough or any power going through the circuit.