Hi Michael, There are several solder joints that look questionable. I’d recommend reflowing all ICs first and then checking whether that resolves the issue. Afterwards, it could also be worth reviewing joints with excess solder, like C56, R51, and similar parts

Thanks, Stefan

Hey Marvin,

until your post here I didn't notice the "CD" in the IBOM ^^

I went with the BOM and built my SUM with regular stereo pots for PAN and EQ and they work just fine

Hey, Thanks for pointing this out. I’ve fixed the trimmer link.

Regarding the iBOM: please ignore the values shown there and use only the Excel BOM for part values. The iBOM currently contains incorrect values and should be used only as a placement/part-location reference on the PCB, not for component specifications. Thanks, Stefan

Hey James,

I´m sorry to hear your Push is not working correctly. I have sent the schematics via email, hope this helps troubleshooting. As a first step I would reflow U1 and U2.

Thanks,

Stefan

Hey Clemens,

Yeah, it’s basically up to the vendors which modules or designs they decide to carry. I totally get that Pusherman has become less attractive since Brexit, but right now they’re still the only dealer offering the full range.

You can always hit up your preferred ST Modular dealer and ask if they can stock a specific design.

Sorry I can’t point you to a German vendor with the full lineup.

Cheers, Stefan

Hey Alex,

Thanks for pointing this out.

Both values actually work, since the LED current limiting is handled by the brightness trimmers for each slider LED. Choosing 100R just gives you a slightly higher maximum brightness range on the trimmer.

To keep things consistent and avoid confusion in the future, I’ve updated the Mouser link to the 100R version.

Cheers,

Stefan

Hey Alex, You´ve got mail! 😉 The outputs you desxcribed are directly connected to Q1, so it might be a good idea to solder a new DMMT3904, also recheck U6! Cheers, Stefan

Hey Kevin, The 2xLFO covers a very wide frequency range in two range modes:

In the slow range it goes down to about 0.0024 Hz, which is roughly one cycle every seven minutes, and it reaches about 0.05 Hz at the fastest setting in that range.

With the fast range engaged, the LFO runs from roughly 1.2 Hz up to about 24.5 Hz, which means it can reach low audio-rate modulation. The output amplitude is typically around 8–10 V peak-to-peak. Currently the module is only availbale as DIY PCB & Panel set. Thanks, Stefan

Hey Shak,

What you’re experiencing is actually the expected behavior of the filter. The resonance begins to come in very subtly around the 12 o’clock position, becomes more pronounced by 3 o’clock, and may get a little unstable beyond that point. This is due to some necessary design compromises in order to keep the circuitry simple and still fit a stereo filter into such a compact HP format.

If you’d like the resonance to take effect earlier, you can reduce the values of resistors R19 and R31. Just keep in mind that this will also make the circuit less stable (what I did not find desirable). Another option is to replace the resonance stereo potentiometer with a linear type, which can give a different feel to the response. Thanks, Stefan