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
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
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!
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
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!
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