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I do believe that I have correctly installed the LED and I can get it to light up if I run power from its positive to negative terminals but not when using the dc jack. When the switch is in bypass position the resistor conducts electricity and does its job, but when the switch is in the active position won't allow anything through. I have no idea how this could happen. I have been testing both 4.7k resistors and 300 ohm resistors and the same thing happens with the switch even though I am just using a battery to test from the resistor to the anode. I have never heard of such a thing so any help will be very welcomed
Thanks
Daniel

That's a really good tip. As far as I can tell the LED hasn't shorted out but I will keep it in mind. Unfortunately my DMM has just ran out of batteries (bad timing huh) so I can't test anything except continuity at the moment. I think I will try you tip about testing it all before soldering the leads though.
Thanks
Daniel

I'll post some pictures as soon as I can.
I have done a lot more troubleshooting into the led issue and have concluded the following

• The LED is not faulty as it consistently lights up when I connect a battery to it
• The 3PDT switch wiring is correctly in accordance with the standard wiring diagram
• I checked all soldered connections with the continuity setting on my DMM

My conclusion is that the resistor I am using is in some way faulty. While I understand that this is extremely uncommon, there is no current flowing through it to make the LED light up. I have tried changing the LEDs which seems to work for a short time but then they stop working. I find this very strange. I am using a 300ohm resistor. Any light you could shed on the possibility of a faulty resistor would be great.
Thanks
Daniel

Thanks for reply. I noticed that another user had a similar problem in which his fuzz pedal made a hum noise due to incorrectly installing a transistor. When building the pedal I had a hard time of correctly orienting the BC109 transitor. Unlike the plastic transistors it is completely round so I tried to use the pin placement to figure it out, i.e. I assumed the two pins next to eachother was the "flat side" on one of the plastic bodied transistor.
In response to you suggesting about running the pedal on a battery I did (made a battery to dc adapter as it's a 1590a build) however the led still didn't light up. The battery is quite old so according to my DMM is only supplying 5 volts, but shouldn't that still be enough to power the led? I do have a basic knowledge of the theory from school but am new to the practical side.
Thanks again
Daniel

Hi all, over the last few months I have spent a lot of time reading thread after thread on this great forum. Well I just finished building the sprout and when I tested it out the effect worked (awesome fuzz) but the led didn't light up and there was a bit of hum which didn't happen with my friends pedals (tested at friends house). So any tips would be great. Also when I went to Jaycar (from Australia) the guy there said that I should be using a 300ohm resistor instead of 4.7k like in the build guide. I'm using the leds from tayda.
Thanks Daniel