Electrovibe no sound

[Orikedmi]

i build the elctro vibe pedal and it didn't work the lfo bulb does not having a light and there is no signal

 

[DeadAirMD]

I'd go over an reflow every solder joint on the entire board. Do you have a photo of the back? Just looking at the switch on the left side of the photo, makes me think that there could either be a solder bridge or joints that need to be reflowed.

I'm having an entirely different problem, where I get full sound, but the chorus doesn't work and the vibe is distorted every time I strum.

 

[Orikedmi]

update there was a solder bridge now the bulb is very low flashing and the a signal only in vibrato mode chorus not working

 

[swelchy]

trim pots? have you adjusted them?

 

[Orikedmi]

trim pots? have you adjusted them?

that helped with the bulb now flashing like its need to but still no any effect

 

[neiltheseal]

If the bulb flashes but you get no sound then that is a clue where the problem is.

Do you know how to make an audio probe? If so try to probe q5, q15 and q6. You should have sound on the collector of all of these (right side with flat face towards you).

 

[DeadAirMD]

So, I went over every single resistor on my EV Mini board and for the first time in over 70+ builds, I screwed up 3 resistors. Found 3 where I put a 4k7 for a 47k and vice-versa. Distortion issues gone and sounds incredible.

I'd wager that you may still have soldering issues and/or components that are not correct. I was getting heavy distortion while strumming (sounded like an absolute shit vibe) and also just had clean signal when switched to "Chorus".

Since there isn't a schematic in the BOM for the EV Mini, I used the picture of the PCB in the store and compared it to the BOM. Took me maybe 10mins to figure out my problems on both boards.

 

[Orikedmi]

If the bulb flashes but you get no sound then that is a clue where the problem is.

Do you know how to make an audio probe? If so try to probe q5, q15 and q6. You should have sound on the collector of all of these (right side with flat face towards you).

5 and 6 have a clear sound 15 has low sound with the the lfo

 

[Orikedmi]

i re flowed every soldering there is a sound ! but very low effect

 

[Feral Feline]

Don’t be disheartened, as progress has been made there is cause to rejoice and reinvigorate anew the chase…

 

[neiltheseal]

i re flowed every soldering there is a sound ! but very low effect

If the emitter of q6 had good sound (left with flat side facing you) then the problem should be after that. There are only 3 parts between q6 and the output. These are R16, c1 and volume pot. Try probing these to see where the sound cuts out

 

[Orikedmi]

If the emitter of q6 had good sound (left with flat side facing you) then the problem should be after that. There are only 3 parts between q6 and the output. These are R16, c1 and volume pot. Try probing these to see where the sound cuts out

the colector and base souund fine but the emiter is low