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?
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!
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
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
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!😃
Hey Taylor,
I’ve just sent you the schematics. I’d suggest focusing on reflowing U1, T6, T2, and the surrounding components.
Best,
Stefan
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