ElectroVibe Noise Issue

[PedalGuy]

Hi! I've recently finished building the ElectroVibe "Uni-Vibe". It sounds wonderful but it produces a high pitched noise (roughly 11.622kHz; wav recorded using Amplitube 5 HiAmp). It's not particularly loud with my master volume at 9 o'clock and channel volume at 3 o'clock on my Custom Hiwatt 50, though it is annoying. Using the Vibe with no other pedals connected and turning my guitar volume all the way up/down had no effect on the severity/pitch of the noise. Any ideas?

Pictures

 

[Jimmyjazz]

Hi, did you manage to sort it? I’ve recently finished mine, sounds amazing except for the same problem that you are experiencing. I believe it could be the charge pump?

 

[PedalGuy]

Hi, did you manage to sort it? I’ve recently finished mine, sounds amazing except for the same problem that you are experiencing. I believe it could be the charge pump?

Unfortunately I have not been able to fix it and after a few weeks of troubleshooting I'd just accepted "defeat". It might be the charge pump; that's about the only thing I have not yet tried messing with. I might just try ordering one from (hopefully) a different batch.

 

[PedalGuy]

Sounds like charge pump whine to me. Isolated power supply?

Yes sir! A 1 Spot Pro CS7.

 

[Jimmyjazz]

I managed to sort mine, as expected it was the charge pump I purchased from Tayda. Made me think twice about buying IC’s from Tayda in the future. Got one from Bitsbox here in the UK, sorted, the whining has gone! All good

 

[Jimmyjazz]

FYI I lifted pin 1 before I plugged it into the socket. All works and sounds great

 

[Jforte1]

Hi! I've recently finished building the ElectroVibe "Uni-Vibe". It sounds wonderful but it produces a high pitched noise (roughly 11.622kHz; wav recorded using Amplitube 5 HiAmp). It's not particularly loud with my master volume at 9 o'clock and channel volume at 3 o'clock on my Custom Hiwatt 50, though it is annoying. Using the Vibe with no other pedals connected and turning my guitar volume all the way up/down had no effect on the severity/pitch of the noise. Any ideas?

Pictures

Sorry in advance for highjacking this thread!

On my Electrovibe build I don’t have the siren noise, but I do have that annoying high-pitched hiss around 6.1k similar (but not exactly) like the wav link above. Also there is lower noise at 100k.. At first I thought I could live with it but recently I realized it‘s coming through clearly in my recordings…

Additionally, This hiss persists even when the pedal is bypassed! I am using a super-quiet isolated power supply; that is not the issue.

The speed and intensity of the hiss changes with my “intensity” & “speed” knob settings so I know I have a problem…

Something else I noticed (once but can’t replicate) was that the red power indicator on the following pedal (blues driver) in my chain was also pulsing in sync with my ”speed” setting... So the issue seems to be affecting the power flow to other pedals as well.

Summary: ElectroVibe pedal noisy @6k &100k hz even when bypassed

Would doing a “true bypass” get rid of the problem?

My pcb/schematic is slightly different - I’ve attached a photos of my build. Here are links to the noise at both speeds.

 

[Robert]

Where'd you get that PCB?

That is not an ElectroVibe PCB....

 

[Laundryroom David]

Where'd you get that PCB?

That is not an ElectroVibe PCB....

I found this:

https://shopee.ph/T-audio-PCBFX-145-Based-On-Shin-EI-Vibe-Chorus-Vibrato-Guitar-Effect-Pedal-DIY-1590BB-i.361756787.19022916246

 

[Robert]

If T-Audio is going to blatantly rip off PCB layouts then T-Audio should provide support for them.

With that out of the way...

I'd be a little concerned about the traces leading from the input/output jacks down to the Bypass footswitch. The circuit should already be true-bypass, so if you have noise when the effect is bypassed the issue is wiring, switches, or jacks.

In this case part of the wiring is incorporated into the PCB itself. Running those traces so closely to all of that active circuitry is asking for trouble. It's a dense layout with a considerable potential for noise between the LFO, lamp driver, and charge pump circuitry.

My advice, if all else fails, is to completely disconnect pins 1 and 6 of the bypass breakout board and run wires from the jacks to those points on the breakout board. (Input jack to 1, Output jack to 6)

 

[Jforte1]

Thanks very much for your reply. I will try looking at the bypass breakout board.

I wasn’t aware of this website before purchasing the PCB. We have very limited options for pedal build supplies in Indonesia but I do appreciate the forum. This is only my second build. Honestly I’m amazed it even works at all!

 

[Jforte1]

My issue is fixed! No more noise at 6khz or 100khz!!! Turns out it was simple. The pcb board has instructions to use jumper if using a certain IC (photo attached)…. In my case, the ic part number was different but meant to replace IC1044…

So sure enough, as soon as I made the connection with the jumper, the noise was gone! So now I am stoked!

Also, I made a little test rig using my battery powered blackstar amp while powered…

Hopefully that helps someone out in the future..

Best wishes,

Julian