Hey all,
i'm having problems with my Alstaden build.
No Output on Wave A, Pulse and Sine.
Wave B, Sub, OUT EQ, Pitch and Finetune work perfectly fine.
First time i soldered Q1 wrong orientation. Maybe that fried another IC?
Any help or schematics greatly appreciated!
Hello all, I would like to know the following on the 2xLFO: 1) what are the audio RATES of the lfos? At the very least what's the slowest rate? 2) where could I obtain this module assembled? It doesn't seem to exist anywhere. Thanks so much.
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
I just bought an assembled Hans filter from Pusherman. The resonance pot has no effect on the output sound except when higher than 3:00, and then only slightly. I wonder if the module was built with a bad or incorrect resistor in the feedback loop.
I can email a video of it in operation if necessary; along with a spectrogram.
Board v1.1. The solder joints all look good under a magnifying glass.
How should I proceed with warrantee repair? Is there anything I can test at home?
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
Hi there!
I have just finished assembling the ST modular Duck. However, it is not working. LEDs are not on and there is no signal passed through. Would it be possible to receive a schematic so I can probe where it is going wrong?
D2 was the wrong way around !
I need some reading glasses for properly seeing the lines on those diodes… thanks!
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