Hi Stefan,
I've sprinted through ~30 SMD populated builds from CalSynth in the last 6 weeks so I've got a few different cleanup tasks, but this is the first:
I built two Alstadens, and both exhibit the exact same vibrato. I can't suss it. I used tempos from Modular Addict in the US (https://modularaddict.com/akaneohm-tempco-3300ppm)
Here's a video showing the behavior on both modules.
https://photos.app.goo.gl/3Ehrnx1nxFNmjukAA
Thanks!
Hey guys,
I was banned by Mouser from buying silicone-based components (diodes, ICs etc) last year as they thought I was an unauthorized reseller. After I explained that I was just an enthusiastic hobby soldering guy they unbanned me and flagged my profile as non-business.
But now I'm affected by the ban of AD (Analog Devices) components for non business customers - Mouser cancelled the respective components from my last order with that exact reason. As I suspect all other vendors (Digikey, TME, etc ) will also not sell me AD components I started to look for alternatives. I was able to find something for almost every AD part, except the LT1931 inverting boost converter.
@Stefan : are you aware of any other inverting boost converter I could use instead of the LT1931? I currently have the PCBs for a workbench on order but the POW! does use the same…
Can I use a 100k trimmer instead for the gain trimpot? Thank you
Hello, I am about to finish the Euphoria Synth. Most of the pcbs are working fine, except the envelope PCB for which I have a missing CD4001. I am also missing the tertiary oscillator pcb. Xan those be bought separately?
However, my problem concerns the Primary oscillator, which is very high pitched even at the lowest primary oscillator frequency level. I tried changing the C34 to a lower value, which indeed allows me to set a lower frequency, but then the slider has only a limited action. And as I read from the CEM3340 datasheet usually that capacitor is fixed to 1.5nF, so I guess this is only a bad solution. There is probably a wrong value somewhere, but rather than desoldering everything, maybe there could be a hint at which components to check first, or a hint on some voltage's I could measure on some pins. Most IC's seem…
Hey Franchesco,
please contact the shop where you purchased the PCBs. There should not be a board missing.
Regarding the high-pitched tone, the cause is likely somewhere around the 3340 frequency section. Relevant parts include C34, R24, R23, C13, RT8, and RT9. The pitch CV input, pitch knobs, and FM inputs can also affect the frequency. I would start by checking those areas closely.
If you need the schematics, just let me know.
Thanks, Stefan