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Building an attenuator - problems

drewfunk

drewfunk

May 10, 2010
358
7
Olympia, Wa
#1
Hey guys, so i'm building a power attenuator for cutting the output on my Fender Pro Junior for quiet recording, and have run into an issue. I am following the build guide [Invalid or Expired Link Removed]

I got it all wired up, double checked everything, hooked it up to my amp, and now i get no sound out of my speaker, just some amp hum. Anything i should look for? The only thing i did differently was use a stereo attenuator, but only used one side of it.
 
#2
Might have to wire the two sides of the Lpad in parallel or series to let the signal through, but that would change your impedance. Should've ordered the 8ohm mono L-pad as instructed.

Those things aren't all that robust with fullrange signal but may be OK for a 15watt amp, although it can put out close to 30 when cranked into distortion. I'd probably get the 100 watter just for a safety margin.
 
#3
if your getting no sound then the wiring is incorrect.

or you have a bad solder connection.

or you might have made a solder bridge somewhere that is shorting out somewhere. maybe the case of the Lpad

or the lugs coming of the Lpad are touching the metal case somewhere.

but sometimes solder connections look good but they are not.
keep the tip clean and get things hot enough so the solder flows nicely. cold solder joints are usually the culprit.

or you switched the order of the lugs, so you might have connected it 3 2 1 instead of 1 2 3 or vice versa.

which would be important since one lug is for ground
and the others for the switch, so if any is reversed nothing is gonna work.
 

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