madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: Sigesmundninja on August 01, 2011, 01:45:50 PM

Title: Lunar Module problem
Post by: Sigesmundninja on August 01, 2011, 01:45:50 PM
So I just finished soldering up a Cosmopolitan "Lunar mod" but i ain't working. I get sound after C1 but not after R2. I have a test-rig I always use and it has never failed me before so jacks and so on shouldn't be the problem.

Did everything acoarding to this http://www.madbeanpedals.com/forum/index.php?topic=2219.0 but my C13 is 2.2nF (couldn't find a 2nF). The Soldering on this board was much harder than on the fabed ones so it lookes pretty crappy but I think it should be ok.

so... whats wrong with this picture?


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Title: Re: Lunar Module problem
Post by: sprayfe on August 01, 2011, 02:04:43 PM
I've had a similar problem on a couple of builds ( losing signal at first or second resistor.) I know you know this- but touch those solder joints- sometimes for me it's been that easy. You're gonna love this pedal when she fires up.  It's crazy versatile!  Also- sometimes I've reversed my testing rig and gone backwards through the circuit to get a better idea of what is going on.
(http://img.photobucket.com/albums/v382/sprayfe/6339f8ce.jpg)
Title: Re: Lunar Module problem
Post by: mgwhit on August 01, 2011, 03:53:14 PM
It looks to me like you may have connected the resistor from your mod to the wrong pin of your Fuzz pot.  Looks like it's going to pin 2 and I assumed from the mod instructions that it should go to ground, which would be pin 1.
Title: Re: Lunar Module problem
Post by: Sigesmundninja on August 01, 2011, 04:57:10 PM
Thank you mgwhit!! You sure spotted it! Not only was it soldered to the wrock lug, it was allso a 100R resistor and not a 100K, gonna box it up now and give it a real go!
Title: Re: Lunar Module problem
Post by: bigmufffuzzwizz on August 01, 2011, 05:10:07 PM
Yup good eye! That's the exact spot your having the problem at too.
Sprayfe - Is that 3 LM's in one box?  :)
Title: Re: Lunar Module problem
Post by: mgwhit on August 01, 2011, 06:01:23 PM
Thanks.  It made sense to look for issues around R2, and once I found that in the photos, the mod was sticking out like a sore thumb.  (No offense, it's the nature of that particular beast.)  I assume all mods are suspect.   ;D

Good luck!