powering LED~~~Phase 90 mod

[Trev Flint]

Hi,

I added an LED, 3pdt switch and 9 volt power jack to my '74 reissue Phase 90.. Everything works fine but I was not sure how to power the LED so I wanted to check with you guys to make sure what I did is ok.

I soldered one leg of the LED to the + tip of the power jack. This is the same spot that I soldered the circuit power wire to that was originally soldered to the battery clip. Does this sound ok? I do notice a subtle "pop" once and a while when I engage the Phase but it's no big deal.

Thanks kindly.

[StevenJM]

There should be a resistor between the power source and the LED.  Start with a 1k, go higher if you want the light to be dimmer.

[Trev Flint]

Thanks for the reply steven, yeah I did put a resistor on there.

[flintstoned]

If wire up the + from the center lug of the speed pot, the led will pulse in sync with it. Again, adjust the resistor size for brightness.

[Trev Flint]

That sounds cool Flintstoned. I might just try that.

[smolder]

do you have to add a 3dpt when putting in an led (74 script phase 90)? Not sure where to attach the negative wire from the LED? The only wiring diagrams I've found are drawn with a 3pdt.

[Fender3D]

do you have to add a 3dpt when putting in an led (74 script phase 90)?

Only if you want true bypass, you may have a DPDT with the stock switching (3PDT will interfere with battery and jacks, though)

Not sure where to attach the negative wire from the LED? The only wiring diagrams I've found are drawn with a 3pdt.

If you connect +V > switch lug1 then switch lug2 > resistor > Anode, cathode will go to GND
If you connect GND > switch lug1 then switch lug2 > resistor > cathode,  Anode will go to +V

[smolder]

Thank you fender3d!

[smolder]

Does it need to be DPDT? The switch in mine has only two contacts. I know where to ground the LED, but I can not seem to find the point to put the positive lead that will work. This seems really simple, but I'm not having success.

[Fender3D]

Your MXR has a SPDT, just like most MXR pedals indeed.
This is what you should do if you don't wanna a 3PDT:



+V is the red wire, usually.

[smolder]

awesome graphic... thanks for that. Mine is a script '74 reissue, so the carling switch has only three contact points. I do have a carling SPDT here... I'll see if it fits.

Your MXR has a SPDT, just like most MXR pedals indeed.
This is what you should do if you don't wanna a 3PDT:



+V is the red wire, usually.

[Fender3D]

awesome graphic... thanks for that.

Thank you, but it's not me... I just googled "pedal dpdt switch"

[smolder]

damn... and I never found it. Anyway... I replaced the switch and wired as per the drawing and it works perfect. As always, the second one would go much quicker and  smoother ; ) thanks again.

awesome graphic... thanks for that.

Thank you, but it's not me... I just googled "pedal dpdt switch"

[Trev Flint]

reviving this because I am experiencing a problem with my true bypass/led mod to the phase 90. Now when I engage the effect I get a "pop" and if I tap the phaser enclosure anywhere it makes a noise as if the enclusure is now amplified. Does anyone have a diagram I can use for the truebypass/led mod so I can start over?

Thanks kindly