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Andrew Kim

Pedal Pal Stereo Expression CV Question

Hi everyone,


Just put together a Pedal Pal Stereo. Everything is working as expected, but I am having some issues with the expression pedal connectivity.


I am trying to interface w the expression pedal input on a Meris Mercury X.  I checked… exp i/o operates on 0-3.3v and delvers voltage to the ring of the TRS cable.  I have a V1 board and all 3 jumpers are in the right place (mine pcb came with a sticker to account for the silkscreen mislabeling).


This is what’s happening:


When I plugin a TRS cable from the expression jack of the pedal it illuminates the CV LED lights when the exp pot is turned cw.   When I adjust the exp pot there is no change except at the lower end (ccw) of the dial when the LED dims and pedal responds suddenly. I’ve scaled the expression input in the pedal too…


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Andrew Kim
Andrew Kim
Jun 09

Dear Stefan, Thank you for your prompt and through reply. Switchign the jumpers did the trick. It appears that the original silkscreen label was correct? Long time time DIYer, but first time pedal user.....I still learing all of the ins and outs. At any rate, Everything now works flawlessly, sounds great. A solid addition to my kit. Thanks again!

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Jungle Baxter

Solder stencil for Envelope

Does anyone know where I can download a gerber file for making a paste stencil for Envelope? Wanting to cut a stencil for the SMT side of the board only.

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st-modular
st-modular
Jun 02

Hey Jungle,


I’ve created the bottom solder paste Gerber and the board outline Gerber for you.


You can download the files here:


https://www.st-modular.de/file-share/fd10033e-7c78-4b36-8786-efb5183b9310


Let me know if it works for you.


Thanks,

Stefan

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TommasoTommaso

SPM right out not working

I just finished assembling SPM v1 and everything seems to work ok, but I have no sound on the right output.

The volume knobs work, the spread works, the left out works, but the right is completely silent.


I've attached a picture of my soldering. I've tried reflowing some of the components, but I can't seem to make it work.


Which components specifically would affect the right out?


Thanks,

Tommaso


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st-modular
st-modular
May 31

Hey again ,

is the right output silent for all 3 inputs?

If yes, I would first focus on the common right-output stage: U3, R105, C39, C1 and the OUT_R jack/solder joints. Also check the solder joints around pins 1, 2 and 3 of U3.

Thanks, Stefan

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TommasoTommaso

Delay volume out too low

Hello, I just finished assembling Delay but the volume out is extremely low. I'm using a 100k trimmer resistor for the out gain, but I can't hear any difference when turning the trimmer.


FWIW I have assembled two copies of the module and both have the same issue.


I've resoldered all the dodgy joints, but it didn't help.


Any ideas of what I can try next?

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Tommaso
May 31

hey thanks for the very detailed reply, unfortunately I smoked the board, so I'll have to get a new one anyway :/

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timm.goerznertimm.goerzner

SUM V2 Heaphone Output

Hi everyone,

I bought the SUM v2 as a preassembled kit from pushermanproductions.com⁠� and successfully completed the build. I’ve already built several modules in the past and rarely had any issues.

Unfortunately, the headphone output on the SUM v2 is not working at all. I have checked the build multiple times and everything appears to be wired and assembled correctly.

I would really appreciate some support or troubleshooting advice.

If necessary, I would also like to know which op amp is responsible for the headphone output stage, so I can investigate further.

Thanks in advance!

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st-modular
st-modular
May 28

Hey Timm, thanks for your message, and sorry about the trouble. If the main L/R outputs work but the headphon output is completely silent, the issue is most likely around the U15 headphone section or the headphone jack/pot area.

Please check the soldering around U15, the headphone volume pot, the nearby capacitors/resistors, and the headphone jack itself. Also check if U15 gets the correct power:

  • pin 4: +12 V

  • pin 11: -12 V

Could you please send a few clear photos of both sides of the PCB around U15 and the headphone output area? I have also emailed you the schematics for further reference.

Thanks, Stefan

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Eric Gao

Radio pre-soldered PCB, constant thumping noise

Hi, wondering if there's anything that would lead to this constant beating noise? You can hear it it's just this rhythmic choppy sound that keeps playing regardless of channel. Switching PSU or cases did not help

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st-modular
st-modular
May 18

Hi Eric

thanks for the audio sample.

IIn a Eurorack system, switching power supplies, LED PWM, digital modules, or an unstable ground reference can sometimes create exactly this kind of hard rhythmic noise. The station itself may be tuned correctly, but the interference is then mixed into the received signal or passed into the audio path.

Could you please try this test:

Remove the module from the rack and power it from a a clean external power supply (if possible, or a PSU with no othe rmodules attached). Do not connect any patch cables except the audio output. Connect a longer patch cable directly as an FM antenna to the output and search for stattions again.

If the noise disappears in this setup, the cause is most likely related to the rack power supply, grounding, or interference being coupled into the antenna path. Thanks, Stefan

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Taylor Richards

Boba Fat Decay not working

I just finished a Boba Fat with a PCB I bought from Pusherman. Everything is working well, but the decay knob isn't doing anything no matter how what I do. I tried the jumper setting on slow and fast and different gate lengths and nothing. All of the other knobs are giving me the expected effect and the soldering all looks good to me. Any idea on what to check? No schematics available correct?


I haven't messed with the trimpots at all but they don't seem to affect anthing relating to the evelope. Also curious what the little squarewave "testpoint" is there for? Any help is appreciated!😃


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st-modular
st-modular
May 05

Hey Taylor,

I’ve just sent you the schematics. I’d suggest focusing on reflowing U1, T6, T2, and the surrounding components.

Best, Stefan

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Joshua Price

Kaui'i Modifications Question

I have built an SMD populated from Calsynth and it's working great but I'm wondering if there's any simple modifications I can make (like swapping some resistors/capacitors) to change the range of the two oscillators. Essentially I'm just looking to bump them up an octave or two.

Also and/or alternatively I am wondering if there's anything I can do to change the effect of it going to no signal at the bottom of the pot's range.

I've attached a video showing how slow it can go and it bottoming out. Thanks!


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st-modular
st-modular
May 04

Hi Joshua,

you can adjust the pitch of the left oscillator via C2 and the right one via C9. Higher capacitance increases the overall pitch.

A higher pitch also ensures the sound remains audible even at the lower end of the potentiometer's range. If this is insufficient, increase the resistance of R2 (left) and R22 (right).

Best,

Stefan

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Maer Ben-Yisrael

Kaui help

Hi Stefan,


Here's another one. I built a Kaui from bare pcb. The adjustment trimmers on the backside have no effect on either oscillator, and the noise circuit is not working at all.


Could I trouble you for the schematic? I have a Calsynth pre-soldered smd module that's working perfectly to compare it to.


Thanks!


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st-modular
st-modular
May 04

You've got mail! 😉

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