ElectroVibe Issue

P

PedalGuy

Member
Hi! I need some help troubleshooting my ElectroVibe; The effect works fine with the jacks not touching the enclosure. As soon as I put them back in though, the effect stops working and I hear the dry guitar signal through my amp. There is no continuity between the tip and the enclosure so I really don't understand what's going on.
Also; when I use the ElectroVibe with my Twin Face it produces a loud whistling LFO effect that sounds like a siren. This only happens on the silicone side, not the germanium side. I can still hear the LFO even with the EV bypassed, though it is less noticeable.
 
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I'm just an idiot! I had the intensity turned all the way down... Well the effect is working now. If only I hadn't ruined that pad... Then again; it's not like that limits the functionality of the pedal it just doesn't look too great.
 
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The high pitched noise is still present though! I don't know how old you are @Big Monk but according to my research you should still be able to hear this pitch well into your 40s maybe 50s depending on your lifestyle (e.g. being a musician) etc. I know for certain that there is an annoying 12kHz noise present that's ruining the pedal for me. I used the Ozone 9 EQ to visualise and isolate that noise. This noise is not present in this YouTube video I have found and does not seem to be "normal" for this pedal. Regardless; I do very much appreciate your help and would like to say thank you!
 
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Big Monk said:
I’m 37.

Chalk it up to the audio quality of the samples as played through my equipment I guess.

How are you powering it? You might be hearing charge pump whine.
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I'm using a power supply (1 Spot Pro CS 7). The noise only seems to affect the dry signal as it is VERY quiet in the vibrato setting. I need to turn my amp way up to even hear it. On the chorus setting I can just about hear the noise at "bedroom playing" levels. I could try using a battery (edit: two batteries) and bypass the charge pump but there is no room for it in the enclosure. I've never had noise issues with this power supply though.
 
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Big Monk said:
Did you measure the BC108s? If they were in a high gain bucket (BC108B/C), oscillation is the likely issue.

Try tacking in a 100-220 pF cap across the feedback resistor (R8) on the Si sode and see if that eliminates it.

View attachment 26612

As for the Vibe noise, it sounds like you are getting oscillation with the Si Fuzz Face engaged and normal bleed through, possibly because of a non-isolated power supply when disengaged.
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Update: The new transistors did not solve the noise issues I was having. I used a 470 pF cap across R8 for now as I currently don't have any spare 100-220 caps (they should arrive tomorrow). That has drastically reduced the noise with the fuzz knob turned all the way up (or down technically speaking). With the fuzz at 90% 60% etc. the noise is still very noticeable. Also the volume drop is insane especially when switching between Si and Ge. I'll try replacing it with a 220pF capacitor (hopefully) tomorrow.
 
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big volume drops between using GE and SI diodes is not unusual.
when your new parts arrive, trying a different value cap across R8 may improve what you are hearing.

try putting a different effect between your twinface and vibe to see if/how it changes the noise you are hearing.
 
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PedalGuy said:
I'm using a power supply (1 Spot Pro CS 7). The noise only seems to affect the dry signal as it is VERY quiet in the vibrato setting. I need to turn my amp way up to even hear it. On the chorus setting I can just about hear the noise at "bedroom playing" levels. I could try using a battery (edit: two batteries) and bypass the charge pump but there is no room for it in the enclosure. I've never had noise issues with this power supply though.
Click to expand...
With the 1 Spot pro, if you know how to bypass the charge pump, you could alway set the 1-spot for 18V and use the input jack.
 
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